{"id":18437,"date":"2026-07-19T06:08:27","date_gmt":"2026-07-18T21:08:27","guid":{"rendered":"https:\/\/genai-ai.co.jp\/ai-kanri\/?p=18437"},"modified":"2026-07-19T06:08:27","modified_gmt":"2026-07-18T21:08:27","slug":"cc-java-switch-case","status":"publish","type":"post","link":"https:\/\/genai-ai.co.jp\/ai-kanri\/blog\/cc-java-switch-case\/","title":{"rendered":"\u30102026\u5e747\u6708\u6700\u65b0\u3011Java switch-case\u6587\u306e\u4f7f\u3044\u65b9\u5b8c\u5168\u30ac\u30a4\u30c9\uff5c\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u30fbswitch\u5f0f\u30fbenum\u5b9f\u52d9\u30d1\u30bf\u30fc\u30f3\u30fbClaude Code\u6d3b\u7528\u307e\u3067"},"content":{"rendered":"\n<style>\n.g-flow-row{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;}\n.g-flow-item{background:linear-gradient(135deg,#1a1a1a,#2a1015);color:#fff;border-radius:8px;padding:16px 14px;min-width:130px;flex:1;text-align:center;}\n.g-flow-arrow{color:#dc2626;font-size:20px;font-weight:700;}\n.g-card-row{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 32px;}\n.g-card-row>div{flex:1;min-width:220px;}\n@media(max-width:600px){\n  .g-flow-row{flex-direction:column;}\n  .g-flow-arrow{transform:rotate(90deg);}\n  .g-card-row{flex-direction:column;}\n  .g-card-row>div{min-width:100%;}\n}\n<\/style>\n\n\n\n<div style=\"margin:0 0 32px;\">\n  <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/07\/thumb-cc-java-switch-case.jpg\" alt=\"\u30102026\u5e747\u6708\u6700\u65b0\u3011Java switch-case\u6587\u306e\u4f7f\u3044\u65b9\u5b8c\u5168\u30ac\u30a4\u30c9\uff5c\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u30fbswitch\u5f0f\u30fbenum\u5b9f\u52d9\u30d1\u30bf\u30fc\u30f3\u30fbClaude Code\u6d3b\u7528\u307e\u3067\" style=\"width:100%;height:auto;border-radius:12px;display:block;\">\n<\/div>\n\n\n\n<div style=\"background:#f8f9fa;border-radius:12px;padding:24px 28px;margin:0 0 32px;border-left:4px solid #f59e0b;\">\n  <p style=\"font-size:15px;font-weight:700;color:#1a1a1a;margin:0 0 16px;\">\u3053\u306e\u8a18\u4e8b\u306e\u5185\u5bb9<\/p>\n  <ol style=\"margin:0;padding-left:20px;font-size:14px;line-height:2.2;list-style:none;\">\n    <li><a href=\"#sec-01\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#f59e0b;font-weight:700;margin-right:8px;\">01<\/span>switch-case\u6587\u3068\u306f\uff5cif-else\u3068\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051<\/a><\/li>\n    <li><a href=\"#sec-02\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#f59e0b;font-weight:700;margin-right:8px;\">02<\/span>\u57fa\u672c\u69cb\u6587\uff1a\u6570\u5024\u30fb\u6587\u5b57\u5217\u30fbdefault\u306e\u66f8\u304d\u65b9<\/a><\/li>\n    <li><a href=\"#sec-03\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#f59e0b;font-weight:700;margin-right:8px;\">03<\/span>\u3010\u91cd\u8981\u3011break\u7701\u7565\u306e\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u3068\u610f\u56f3\u7684\u306a\u6d3b\u7528<\/a><\/li>\n    <li><a href=\"#sec-04\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#f59e0b;font-weight:700;margin-right:8px;\">04<\/span>\u8907\u6570case\u3092\u540c\u3058\u51e6\u7406\u306b\u307e\u3068\u3081\u308b\u65b9\u6cd5<\/a><\/li>\n    <li><a href=\"#sec-05\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#f59e0b;font-weight:700;margin-right:8px;\">05<\/span>enum\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u5b9f\u52d9\u30d1\u30bf\u30fc\u30f3<\/a><\/li>\n    <li><a href=\"#sec-06\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#f59e0b;font-weight:700;margin-right:8px;\">06<\/span>Java14\u4ee5\u964d\u306eswitch\u5f0f\uff08->\u8a18\u6cd5\u30fbyield\uff09<\/a><\/li>\n    <li><a href=\"#sec-07\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#f59e0b;font-weight:700;margin-right:8px;\">07<\/span>\u3088\u304f\u3042\u308b\u30df\u30b9\u30fb\u30a8\u30e9\u30fc\u3068\u30c7\u30d0\u30c3\u30b0\u65b9\u6cd5<\/a><\/li>\n    <li><a href=\"#sec-08\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#f59e0b;font-weight:700;margin-right:8px;\">08<\/span>\u5b9f\u52d9\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u5225\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30b3\u30fc\u30c9\u96c6<\/a><\/li>\n    <li><a href=\"#sec-09\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#f59e0b;font-weight:700;margin-right:8px;\">09<\/span>Claude Code\u3067Java switch-case\u3092\u81ea\u52d5\u751f\u6210\u3059\u308b<\/a><\/li>\n    <li><a href=\"#faq\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#f59e0b;font-weight:700;margin-right:8px;\">FAQ<\/span>\u3088\u304f\u3042\u308b\u8cea\u554f<\/a><\/li>\n  <\/ol>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Java\u306e\u30b3\u30fc\u30c9\u3067swich\u30fccase\u3092\u4f7f\u3044\u59cb\u3081\u308b\u3068\u300c\u306a\u305c\u304b\u3059\u3079\u3066\u306ecase\u304c\u5b9f\u884c\u3055\u308c\u308b\u300d\u300cenum\u3068\u3069\u3046\u7d44\u307f\u5408\u308f\u305b\u308b\u306e\u304b\u5206\u304b\u3089\u306a\u3044\u300d\u300cJava14\u4ee5\u964d\u3067\u65b0\u3057\u3044\u66f8\u304d\u65b9\u304c\u3042\u308b\u3063\u3066\u805e\u3044\u305f\u3051\u3069\u4f55\u304c\u5909\u308f\u3063\u305f\uff1f\u300d\u3068\u3044\u3046\u7591\u554f\u306b\u3076\u3064\u304b\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Java switch-case\u6587\u306e<strong>\u57fa\u672c\u304b\u3089\u5b9f\u52d9\u30ec\u30d9\u30eb\u307e\u3067<\/strong>\u3092\u4e00\u6c17\u306b\u6574\u7406\u3057\u307e\u3059\u3002\u7279\u306b\u521d\u5fc3\u8005\u304c\u5d4c\u307e\u308a\u3084\u3059\u3044<strong>\u300cbreak\u7701\u7565\u306b\u3088\u308b\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\uff08\u610f\u56f3\u305b\u305a\u5168case\u304c\u5b9f\u884c\u3055\u308c\u308b\u30d0\u30b0\uff09\u300d<\/strong>\u3068\u3001Java14\u3067\u8ffd\u52a0\u3055\u308c\u305f<strong>\u300cswitch\u5f0f\uff08->\u8a18\u6cd5\uff09\u300d<\/strong>\u307e\u3067\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">switch-case\u306fif-else\u306e\u300c\u5225\u306e\u66f8\u304d\u65b9\u300d\u3067\u306f\u306a\u304f\u3001\u300c\u7279\u5b9a\u306e\u6761\u4ef6\u4e0b\u3067\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u30fb\u9ad8\u901f\u306b\u52d5\u4f5c\u3059\u308b\u5c02\u7528\u69cb\u6587\u300d\u3067\u3059\u3002\u3069\u3061\u3089\u3092\u4f7f\u3046\u3079\u304d\u304b\u306e\u5224\u65ad\u57fa\u6e96\u3082\u542b\u3081\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">Java\u3067switch-case\u3092\u66f8\u304f\u6a5f\u4f1a\u306f\u5165\u9580\u30ec\u30d9\u30eb\u304b\u3089\u696d\u52d9\u7cfb\u30b7\u30b9\u30c6\u30e0\u307e\u3067\u975e\u5e38\u306b\u591a\u3044\u3067\u3059\u3002\u7279\u306benum\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u73fe\u5834\u306eJava\u30b3\u30fc\u30c9\u3067\u983b\u51fa\u3057\u307e\u3059\u3002\u4eca\u65e5\u306f\u305d\u3053\u307e\u3067\u542b\u3081\u3066\u6574\u7406\u3057\u307e\u3057\u3087\u3046\u3002<\/div>\n<\/div>\n\n\n\n<div style=\"background:#fafafa;border-radius:8px;padding:16px 20px;margin:16px 0;border-left:4px solid #dc2626;\">\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>switch-case\u6587\u306e<strong>\u57fa\u672c\u69cb\u6587<\/strong>\uff08\u6570\u5024\u30fb\u6587\u5b57\u5217\u30fbdefault\uff09<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>break\u7701\u7565\u306e\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc<\/strong>\u304c\u306a\u305c\u5371\u967a\u304b\u3001\u3068\u610f\u56f3\u7684\u306a\u6d3b\u7528\u6cd5<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u8907\u6570case\u3092\u4e00\u3064\u306e\u51e6\u7406\u306b\u307e\u3068\u3081\u308b<strong>\u8907\u6570\u30e9\u30d9\u30eb<\/strong>\u306e\u66f8\u304d\u65b9<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>enum\u578b<\/strong>\u3068switch-case\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u5b9f\u52d9\u30d1\u30bf\u30fc\u30f3<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>Java14\u4ee5\u964d\u306eswitch\u5f0f<\/strong>\uff08->\u8a18\u6cd5\u30fbyield\uff09\u306b\u3088\u308b\u7c21\u6f54\u306a\u66f8\u304d\u65b9<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>Claude Code<\/strong>\u3067Java switch-case\u30b3\u30fc\u30c9\u3092\u81ea\u52d5\u751f\u6210\u3059\u308b\u65b9\u6cd5<\/span><\/div>\n\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-switch-case&#038;blog_slug=cc-java-switch-case\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-java-switch-case&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-01\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">01<\/span>\n  <span class=\"section-label\" style=\"display:block;\">OVERVIEW<\/span>\n  <span class=\"section-title\" style=\"display:block;\">switch-case\u6587\u3068\u306f\uff5cif-else\u3068\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051<\/span>\n  <span class=\"section-desc\">\u6761\u4ef6\u5206\u5c90\u306e\u7a2e\u985e\u3068switch-case\u304c\u9069\u5207\u306a\u5834\u9762<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">switch-case\u6587\u306f\u3001<strong>\u4e00\u3064\u306e\u5909\u6570\u306e\u5024\u304c\u300c\u4f55\u306b\u7b49\u3057\u3044\u304b\u300d<\/strong>\u306b\u3088\u3063\u3066\u51e6\u7406\u3092\u5206\u5c90\u3055\u305b\u308bJava\u306e\u5236\u5fa1\u69cb\u6587\u3067\u3059\u3002\u300cA\u306a\u3089X\u3001B\u306a\u3089Y\u3001C\u306a\u3089Z\u3001\u305d\u308c\u4ee5\u5916\u306a\u3089W\u300d\u3068\u3044\u3046\u5f62\u306e\u5206\u5c90\u3092\u3001if-else\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u66f8\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>switch-case\u6587<\/strong>\uff1aJava\u306e\u5236\u5fa1\u69cb\u6587\u306e\u4e00\u3064\u3002switch(\u5f0f)\u3067\u30ab\u30c3\u30b3\u5185\u306e\u5024\u3092\u8a55\u4fa1\u3057\u3001case\u30e9\u30d9\u30eb\u306e\u5024\u3068\u4e00\u81f4\u3057\u305f\u7b87\u6240\u304b\u3089\u51e6\u7406\u3092\u958b\u59cb\u3059\u308b\u3002\u4e00\u81f4\u3059\u308bcase\u304c\u306a\u3044\u5834\u5408\u306fdefault\u30e9\u30d9\u30eb\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\uff08default\u306f\u7701\u7565\u53ef\uff09\u3002break\u3092\u66f8\u304b\u306a\u3044\u3068\u6b21\u306ecase\u306b\u51e6\u7406\u304c\u6d41\u308c\u8fbc\u3080\uff08\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\uff09\u3002Java7\u4ee5\u964d\u3067String\u578b\u3001Java14\u4ee5\u964d\u3067switch\u5f0f\u3082\u30b5\u30dd\u30fc\u30c8\u3002<\/p>\n<\/div>\n\n\n\n<table>\n<thead><tr><th>\u6bd4\u8f03\u9805\u76ee<\/th><th>if-else\u6587<\/th><th>switch-case\u6587<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u4f7f\u3048\u308b\u6761\u4ef6<\/td><td>\u3059\u3079\u3066\u306e\u6761\u4ef6\u5f0f\uff08>, <, &&, ||\u7b49\uff09<\/td><td>\u7b49\u5024\u6bd4\u8f03\u306e\u307f\uff08==\u76f8\u5f53\uff09<\/td><\/tr>\n<tr><td>\u4f7f\u3048\u308b\u578b<\/td><td>\u3059\u3079\u3066\u306e\u578b<\/td><td>int, char, String, enum\uff08Java\u7248\u306b\u4f9d\u5b58\uff09<\/td><\/tr>\n<tr><td>\u53ef\u8aad\u6027<\/td><td>\u8907\u96d1\u306a\u6761\u4ef6\u306f\u8aad\u307f\u3084\u3059\u3044<\/td><td>\u7b49\u5024\u6bd4\u8f03\u306e\u591a\u6761\u4ef6\u5206\u5c90\u3067\u8aad\u307f\u3084\u3059\u3044<\/td><\/tr>\n<tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u6761\u4ef6\u3092\u4e0a\u304b\u3089\u9806\u306b\u8a55\u4fa1<\/td><td>\u5185\u90e8\u3067\u30c6\u30fc\u30d6\u30eb\u53c2\u7167\uff08\u5927\u91cf\u306e\u7b49\u5024\u6bd4\u8f03\u3067\u9ad8\u901f\uff09<\/td><\/tr>\n<tr><td>Java14\u4ee5\u964d<\/td><td>\u5909\u5316\u306a\u3057<\/td><td>switch\u5f0f\uff08->\u8a18\u6cd5\uff09\u3067\u7c21\u6f54\u3055\u304c\u5927\u5e45\u5411\u4e0a<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\">\n  <div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\">\n    <span style=\"font-size:18px;\">&#128161;<\/span>\n    <strong style=\"color:#16a34a;font-size:15px;\">switch-case\u304c\u9069\u5207\u306a\u5834\u9762\u306e\u5224\u65ad\u57fa\u6e96<\/strong>\n  <\/div>\n  <p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">\u300c1\u3064\u306e\u5909\u6570\u306e\u5024\u304c\u8907\u6570\u306e\u56fa\u5b9a\u5024\u306e\u3069\u308c\u3068\u4e00\u81f4\u3059\u308b\u304b\u300d\u3092\u5224\u5b9a\u3059\u308b\u5834\u9762\u304cswitch-case\u306e\u51fa\u756a\u3067\u3059\u3002\u4f8b\u3048\u3070\u300c\u30b3\u30de\u30f3\u30c9\u756a\u53f71\u301c10\u306b\u3088\u308b\u51e6\u7406\u5206\u5c90\u300d\u300c\u66dc\u65e5\uff08MON\/TUE\/WED...\uff09\u306b\u3088\u308b\u51e6\u7406\u5206\u5c90\u300d\u300c\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\u306b\u3088\u308b\u51e6\u7406\u5206\u5c90\u300d\u3002\u9006\u306b\u3001\u7bc4\u56f2\u6bd4\u8f03\uff08x > 10\uff09\u3084\u8907\u6570\u5909\u6570\u306e\u7d44\u307f\u5408\u308f\u305b\u5224\u5b9a\u306b\u306f if-else \u304c\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-switch-case&#038;blog_slug=cc-java-switch-case\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-java-switch-case&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-02\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">02<\/span>\n  <span class=\"section-label\" style=\"display:block;\">BASIC SYNTAX<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u57fa\u672c\u69cb\u6587\uff1a\u6570\u5024\u30fb\u6587\u5b57\u5217\u30fbdefault\u306e\u66f8\u304d\u65b9<\/span>\n  <span class=\"section-desc\">switch-case\u306e\u69cb\u9020\u3068\u5404\u8981\u7d20\u306e\u610f\u5473\u3092\u89e3\u8aac<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">switch-case\u6587\u306e\u57fa\u672c\u69cb\u9020\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ switch-case\u6587\u306e\u57fa\u672c\u69cb\u6587\nswitch (\u5f0f) {\n    case \u50241:\n        \/\/ \u5f0f == \u50241 \u306e\u3068\u304d\u306b\u5b9f\u884c\u3059\u308b\u51e6\u7406\n        break;  \/\/ \u2190 \u5fd8\u308c\u308b\u3068\u6b21\u306ecase\u306b\u6d41\u308c\u308b\uff08\u5f8c\u8ff0\uff09\n    case \u50242:\n        \/\/ \u5f0f == \u50242 \u306e\u3068\u304d\u306b\u5b9f\u884c\u3059\u308b\u51e6\u7406\n        break;\n    default:\n        \/\/ \u3069\u306ecase\u306b\u3082\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306e\u51e6\u7406\n        break;  \/\/ default\u306ebreak\u306f\u7701\u7565\u53ef\u3060\u304c\u4ed8\u3051\u305f\u65b9\u304c\u5b89\u5168\n}<\/pre>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">2-1. \u6570\u5024\u3067\u306eswitch-case<\/h3>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">public class SwitchExample {\n    public static void main(String[] args) {\n        int day = 3;\n\n        switch (day) {\n            case 1:\n                System.out.println(\"\u6708\u66dc\u65e5\");\n                break;\n            case 2:\n                System.out.println(\"\u706b\u66dc\u65e5\");\n                break;\n            case 3:\n                System.out.println(\"\u6c34\u66dc\u65e5\");  \/\/ \u2190 day=3 \u306a\u306e\u3067\u3053\u308c\u304c\u5b9f\u884c\u3055\u308c\u308b\n                break;\n            case 4:\n                System.out.println(\"\u6728\u66dc\u65e5\");\n                break;\n            case 5:\n                System.out.println(\"\u91d1\u66dc\u65e5\");\n                break;\n            default:\n                System.out.println(\"\u9031\u672b\");\n                break;\n        }\n    }\n}\n\/\/ \u51fa\u529b: \u6c34\u66dc\u65e5<\/pre>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">2-2. String\u578b\u3067\u306eswitch-case\uff08Java7\u4ee5\u964d\uff09<\/h3>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>Java7\u4ee5\u964d\u306eString\u5bfe\u5fdc<\/strong>\uff1aJava7\uff082011\u5e74\u30ea\u30ea\u30fc\u30b9\uff09\u304b\u3089switch\u6587\u3067String\u578b\u3092\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3002Java6\u4ee5\u524d\u306fString\u578b\u306eswitch-case\u304c\u4f7f\u3048\u306a\u3044\u305f\u3081\u3001if-else\u304benum\u3067\u4ee3\u66ff\u3059\u308b\u5fc5\u8981\u304c\u3042\u3063\u305f\u3002\u73fe\u4ee3\u306eJava\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\uff08Java8\/11\/17\/21\u7b49\uff09\u3067\u306fString\u578b\u306eswitch-case\u306f\u6a19\u6e96\u7684\u306b\u4f7f\u7528\u3067\u304d\u308b\u3002<\/p>\n<\/div>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">public class SwitchString {\n    public static void main(String[] args) {\n        String command = \"start\";\n\n        switch (command) {\n            case \"start\":\n                System.out.println(\"\u51e6\u7406\u3092\u958b\u59cb\u3057\u307e\u3059\");\n                break;\n            case \"stop\":\n                System.out.println(\"\u51e6\u7406\u3092\u505c\u6b62\u3057\u307e\u3059\");\n                break;\n            case \"status\":\n                System.out.println(\"\u5b9f\u884c\u4e2d\u3067\u3059\");\n                break;\n            default:\n                System.out.println(\"\u4e0d\u660e\u306a\u30b3\u30de\u30f3\u30c9: \" + command);\n                break;\n        }\n    }\n}\n\/\/ \u51fa\u529b: \u51e6\u7406\u3092\u958b\u59cb\u3057\u307e\u3059\n\n\/\/ \u6ce8\u610f: String\u578b\u306eswitch-case\u306f\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3059\u308b\n\/\/ command = \"Start\" \u306e\u5834\u5408\u306f default \u306b\u843d\u3061\u308b\n\/\/ \u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u7121\u8996\u3057\u305f\u3044\u5834\u5408: switch (command.toLowerCase()) {<\/pre>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">2-3. default\u53e5\u306e\u5f79\u5272<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>default<\/code>\u306f\u3001<strong>\u3069\u306ecase\u30e9\u30d9\u30eb\u306b\u3082\u4e00\u81f4\u3057\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u5b9f\u884c\u3055\u308c\u308b\u51e6\u7406<\/strong>\u3092\u66f8\u304f\u5834\u6240\u3067\u3059\u3002if-else\u306eelse\u306b\u76f8\u5f53\u3057\u307e\u3059\u3002default\u306f\u7701\u7565\u53ef\u80fd\u3067\u3059\u304c\u3001\u4e88\u671f\u3057\u306a\u3044\u5024\u304c\u6765\u305f\u5834\u5408\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u305f\u3081\u306b\u66f8\u3044\u3066\u304a\u304f\u306e\u304c\u63a8\u5968\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">switch (status) {\n    case \"active\":\n        processActive();\n        break;\n    case \"inactive\":\n        processInactive();\n        break;\n    default:\n        \/\/ \u4e88\u671f\u3057\u306a\u3044\u5024\u304c\u6765\u305f\u5834\u5408\u306e\u5b89\u5168\u306a\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\n        throw new IllegalArgumentException(\"\u4e0d\u660e\u306a\u30b9\u30c6\u30fc\u30bf\u30b9: \" + status);\n}<\/pre>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-switch-case&#038;blog_slug=cc-java-switch-case\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-java-switch-case&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-03\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">03<\/span>\n  <span class=\"section-label\" style=\"display:block;\">FALLTHROUGH<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u3010\u91cd\u8981\u3011break\u7701\u7565\u306e\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u3068\u610f\u56f3\u7684\u306a\u6d3b\u7528<\/span>\n  <span class=\"section-desc\">break\u5fd8\u308c\u3067\u5168case\u5b9f\u884c\u3055\u308c\u308b\u7f60\u3068\u3001\u610f\u56f3\u7684\u306b\u4f7f\u3046\u5834\u9762<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#fef2f2;border:2px solid #dc2626;border-radius:8px;padding:20px 24px;margin:24px 0;\">\n  <div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\">\n    <span style=\"font-size:20px;\">&#9888;&#65039;<\/span>\n    <strong style=\"color:#dc2626;font-size:16px;\">break\u3092\u5fd8\u308c\u308b\u3068\u3059\u3079\u3066\u306ecase\u304c\u5b9f\u884c\u3055\u308c\u7d9a\u3051\u308b\uff01<\/strong>\n  <\/div>\n  <p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">Java\u306eswitch-case\u306f\u3001\u4e00\u81f4\u3057\u305fcase\u304b\u3089\u300cbreak\u304c\u51fa\u3066\u304f\u308b\u307e\u3067\u300d\u51e6\u7406\u3092\u5b9f\u884c\u3057\u7d9a\u3051\u307e\u3059\u3002break\u306a\u3057\u3060\u3068\u6b21\u306ecase\u3001\u305d\u306e\u307e\u305f\u6b21\u306ecase\u3068\u51e6\u7406\u304c\u6d41\u308c\u8fbc\u3093\u3067\u3044\u304d\u307e\u3059\uff08\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\uff09\u3002\u3053\u308c\u306fJava\u306eswitch-case\u306e\u6700\u5927\u306e\u843d\u3068\u3057\u7a74\u3067\u3001\u521d\u5fc3\u8005\u304c\u30d0\u30b0\u3092\u8d77\u3053\u3059\u539f\u56e0\u7b2c1\u4f4d\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ ===== NG\u30d1\u30bf\u30fc\u30f3\uff1abreak\u3092\u5fd8\u308c\u305f\u5834\u5408 =====\nint num = 1;\nswitch (num) {\n    case 1:\n        System.out.println(\"1\u3067\u3059\");   \/\/ \u2190 \u3053\u308c\u304c\u5b9f\u884c\u3055\u308c\u308b\n        \/\/ break \u304c\u306a\u3044\uff01\n    case 2:\n        System.out.println(\"2\u3067\u3059\");   \/\/ \u2190 break\u306a\u3057\u306a\u306e\u3067\u3053\u3053\u3082\u5b9f\u884c\u3055\u308c\u308b\n        \/\/ break \u304c\u306a\u3044\uff01\n    case 3:\n        System.out.println(\"3\u3067\u3059\");   \/\/ \u2190 \u3053\u3053\u3082\u5b9f\u884c\u3055\u308c\u308b\n        break;\n    default:\n        System.out.println(\"\u305d\u306e\u4ed6\");\n}\n\/\/ \u51fa\u529b:\n\/\/ 1\u3067\u3059\n\/\/ 2\u3067\u3059\n\/\/ 3\u3067\u3059\n\/\/ \u2190 num=1\u306a\u306e\u306b3\u307e\u3067\u5b9f\u884c\u3055\u308c\u305f\uff01<\/pre>\n<\/div>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\uff08Fallthrough\uff09<\/strong>\uff1aswitch-case\u6587\u3067break\u3092\u7701\u7565\u3057\u305f\u5834\u5408\u306b\u3001\u4e00\u81f4\u3057\u305fcase\u304b\u3089\u6b21\u306ecase\u3078\u51e6\u7406\u304c\u300c\u6d41\u308c\u843d\u3061\u3066\u300d\u3044\u304f\u73fe\u8c61\u3002Java\u306fcase\u306b\u4e00\u81f4\u3057\u305f\u5f8c\u3001break\u306b\u5230\u9054\u3059\u308b\u307e\u3067\u3059\u3079\u3066\u306ecase\u306e\u51e6\u7406\u3092\u9806\u756a\u306b\u5b9f\u884c\u3057\u7d9a\u3051\u308b\u3002\u3053\u308c\u306fC\u3084C++\u304b\u3089\u5f15\u304d\u7d99\u3044\u3060\u4ed5\u69d8\u3067\u3001\u610f\u56f3\u3057\u306a\u3044\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u306f\u53e4\u304f\u304b\u3089Java\u306e\u30d0\u30b0\u306e\u6e29\u5e8a\u306b\u306a\u3063\u3066\u3044\u308b\u3002Java14\u306eswitch\u5f0f\uff08->\u8a18\u6cd5\uff09\u306f\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u304c\u767a\u751f\u3057\u306a\u3044\u8a2d\u8a08\u306b\u306a\u3063\u3066\u3044\u308b\u3002<\/p>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">3-1. \u610f\u56f3\u7684\u306a\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u306e\u6d3b\u7528<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u306f<strong>\u300c\u8907\u6570\u306e\u5024\u3067\u540c\u3058\u51e6\u7406\u3092\u3057\u305f\u3044\u300d<\/strong>\u5834\u5408\u306b\u610f\u56f3\u7684\u306b\u4f7f\u3046\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u30b3\u30fc\u30c9\u3092\u8aad\u3080\u4eba\u304c\u300cbreak\u5fd8\u308c\u304b\u610f\u56f3\u7684\u304b\u300d\u3092\u5224\u65ad\u3067\u304d\u308b\u3088\u3046\u3001\u30b3\u30e1\u30f3\u30c8\u3092\u5fc5\u305a\u4ed8\u3051\u308b\u3053\u3068\u304c\u63a8\u5968\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ \u610f\u56f3\u7684\u306a\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u306e\u4f8b\uff08\u30b3\u30e1\u30f3\u30c8\u3067\u610f\u56f3\u3092\u660e\u793a\uff09\nint month = 4;\nswitch (month) {\n    case 1:\n    case 3:\n    case 5:\n    case 7:\n    case 8:\n    case 10:\n    case 12:\n        System.out.println(\"31\u65e5\u307e\u3067\");\n        break;\n    case 4:\n    case 6:\n    case 9:\n    case 11:\n        System.out.println(\"30\u65e5\u307e\u3067\");  \/\/ \u2190 month=4 \u306a\u306e\u3067\u3053\u3053\u304c\u5b9f\u884c\u3055\u308c\u308b\n        break;\n    case 2:\n        System.out.println(\"28\u65e5\u307e\u305f\u306f29\u65e5\");\n        break;\n}\n\/\/ \u51fa\u529b: 30\u65e5\u307e\u3067\n\n\/\/ \u305f\u3060\u3057\u3001\u3053\u306e\u66f8\u304d\u65b9\u306f\u5f8c\u8ff0\u306e\u300c\u8907\u6570\u30e9\u30d9\u30eb\u300d\u3067\u3088\u308a\u3059\u3063\u304d\u308a\u66f8\u3051\u308b<\/pre>\n<\/div>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\">\n  <div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\">\n    <span style=\"font-size:18px;\">&#128161;<\/span>\n    <strong style=\"color:#16a34a;font-size:15px;\">\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u9632\u6b62\u306e\u7fd2\u6163<\/strong>\n  <\/div>\n  <p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">\u300c\u307e\u305a\u3059\u3079\u3066\u306ecase\u306bbreak\u3092\u66f8\u3044\u3066\u304b\u3089\u51e6\u7406\u3092\u66f8\u304f\u300d\u3068\u3044\u3046\u9806\u5e8f\u3067\u66f8\u304f\u7fd2\u6163\u3092\u4ed8\u3051\u308b\u3068\u3001break\u5fd8\u308c\u3092\u5927\u5e45\u306b\u6e1b\u3089\u305b\u307e\u3059\u3002\u307e\u305f\u3001Java14\u4ee5\u964d\u306eswitch\u5f0f\uff08->\u8a18\u6cd5\uff09\u306f\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u304c\u69cb\u9020\u7684\u306b\u8d77\u304d\u306a\u3044\u305f\u3081\u3001\u65b0\u898f\u30b3\u30fc\u30c9\u3067\u306fswitch\u5f0f\u306e\u4f7f\u7528\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-switch-case&#038;blog_slug=cc-java-switch-case\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-java-switch-case&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-04\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">04<\/span>\n  <span class=\"section-label\" style=\"display:block;\">MULTI CASE<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u8907\u6570case\u3092\u540c\u3058\u51e6\u7406\u306b\u307e\u3068\u3081\u308b\u65b9\u6cd5<\/span>\n  <span class=\"section-desc\">case a: case b: \u306e\u307e\u3068\u3081\u66f8\u304d\u3068Java14\u306e->\u8a18\u6cd5<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8907\u6570\u306e\u5024\u3067\u540c\u3058\u51e6\u7406\u3092\u3057\u305f\u3044\u5834\u5408\u306f\u3001<strong>case \u30e9\u30d9\u30eb\u3092\u4e26\u3079\u3066\u66f8\u304f\uff08\u8907\u6570\u30e9\u30d9\u30eb\uff09<\/strong>\u306e\u304c\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u65b9\u6cd5\u3067\u3059\u3002\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u3092\u6d3b\u7528\u3057\u307e\u3059\u304c\u3001\u300cbreak\u306a\u3057\u300d\u3067\u610f\u56f3\u7684\u306b\u4f7f\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u660e\u78ba\u306a\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ ===== Java8\u4ee5\u524d\uff08\u8907\u6570\u30e9\u30d9\u30eb\u306e\u5f93\u6765\u8a18\u6cd5\uff09=====\nString dayType;\nint day = 6; \/\/ 6=\u571f\u66dc\u65e5\n\nswitch (day) {\n    case 1:\n    case 2:\n    case 3:\n    case 4:\n    case 5:\n        dayType = \"\u5e73\u65e5\";\n        break;\n    case 6:\n    case 7:\n        dayType = \"\u9031\u672b\";  \/\/ \u2190 day=6 \u306a\u306e\u3067\u3053\u3053\u304c\u5b9f\u884c\u3055\u308c\u308b\n        break;\n    default:\n        dayType = \"\u4e0d\u660e\";\n        break;\n}\nSystem.out.println(dayType);  \/\/ \u51fa\u529b: \u9031\u672b\n\n\/\/ ===== Java14\u4ee5\u964d\uff08switch\u5f0f\u306e\u8907\u6570\u30e9\u30d9\u30eb\u30fb\u30ab\u30f3\u30de\u533a\u5207\u308a\uff09=====\nString dayType14 = switch (day) {\n    case 1, 2, 3, 4, 5 -> \"\u5e73\u65e5\";  \/\/ \u30ab\u30f3\u30de\u533a\u5207\u308a\u3067\u8907\u6570\u5024\u3092\u4e00\u884c\u306b\u66f8\u3051\u308b\n    case 6, 7           -> \"\u9031\u672b\";\n    default             -> \"\u4e0d\u660e\";\n};\nSystem.out.println(dayType14);  \/\/ \u51fa\u529b: \u9031\u672b<\/pre>\n<\/div>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>\u8907\u6570\u30e9\u30d9\u30eb\uff08Multiple Case Labels\uff09<\/strong>\uff1aswitch-case\u6587\u3067case a: case b: \u306e\u3088\u3046\u306b\u8907\u6570\u306ecase\u30e9\u30d9\u30eb\u3092\u7d9a\u3051\u3066\u66f8\u304f\u3053\u3068\u3067\u3001\u8907\u6570\u306e\u5024\u306b\u5bfe\u3057\u3066\u540c\u3058\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u3002\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u3092\u610f\u56f3\u7684\u306b\u5229\u7528\u3057\u3066\u3044\u308b\u304c\u3001\u51e6\u7406\u304c\u76f4\u5f8c\u306ecase\u5185\u306b\u66f8\u304b\u308c\u3066\u3044\u308b\u305f\u3081\u300c\u610f\u56f3\u7684\u300d\u3067\u3042\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u3084\u3059\u3044\u3002Java14\u4ee5\u964d\u306eswitch\u5f0f\u3067\u306fcase 1, 2, 3 ->\u3068\u30ab\u30f3\u30de\u533a\u5207\u308a\u3067\u4e00\u884c\u306b\u66f8\u3051\u308b\u305f\u3081\u3001\u3088\u308a\u660e\u78ba\u3002<\/p>\n<\/div>\n\n\n\n<div class=\"g-flow-row\" style=\"margin:24px 0;\">\n  <div class=\"g-flow-item\"><strong>switch(day)\u3067\u5024\u3092\u8a55\u4fa1<\/strong><br><span style=\"font-size:12px;\">day=6<\/span><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\"><strong>case 1\u301c5\u3092\u78ba\u8a8d<\/strong><br><span style=\"font-size:12px;\">6 != 1,2,3,4,5<br>\u3059\u3079\u3066\u30b9\u30ad\u30c3\u30d7<\/span><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\"><strong>case 6: \u306b\u30de\u30c3\u30c1<\/strong><br><span style=\"font-size:12px;\">\u3053\u3053\u304b\u3089\u5b9f\u884c\u958b\u59cb<\/span><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\"><strong>dayType = \"\u9031\u672b\"<\/strong><br><span style=\"font-size:12px;\">\u4ee3\u5165\u51e6\u7406\u3092\u5b9f\u884c<\/span><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\"><strong>break\u3067switch\u3092\u629c\u3051\u308b<\/strong><br><span style=\"font-size:12px;\">case 7: \u306f\u5b9f\u884c\u3055\u308c\u306a\u3044<\/span><\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-switch-case&#038;blog_slug=cc-java-switch-case\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-java-switch-case&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-05\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">05<\/span>\n  <span class=\"section-label\" style=\"display:block;\">ENUM<\/span>\n  <span class=\"section-title\" style=\"display:block;\">enum\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u5b9f\u52d9\u30d1\u30bf\u30fc\u30f3<\/span>\n  <span class=\"section-desc\">\u73fe\u5834\u306eJava\u30b3\u30fc\u30c9\u3067\u983b\u51fa\u3059\u308benum + switch-case\u306e\u66f8\u304d\u65b9<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u73fe\u5834\u306eJava\u30b3\u30fc\u30c9\u3067\u6700\u3082\u3088\u304f\u898b\u308bswitch-case\u306e\u4f7f\u3044\u65b9\u304c\u3001<strong>enum\uff08\u5217\u6319\u578b\uff09\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/strong>\u3067\u3059\u3002\u6587\u5b57\u5217\u3084\u6570\u5024\u3067\u306a\u304fenum\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u300c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u5024\u304c\u6765\u308b\u3053\u3068\u3092\u578b\u30b7\u30b9\u30c6\u30e0\u304c\u9632\u3044\u3067\u304f\u308c\u308b\u300d\u3068\u3044\u3046\u5b89\u5168\u6027\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>enum\uff08\u5217\u6319\u578b\uff09<\/strong>\uff1aJava\u56fa\u6709\u306e\u578b\u3067\u3001\u300c\u6c7a\u307e\u3063\u305f\u5024\u306e\u96c6\u5408\u300d\u3092\u578b\u3068\u3057\u3066\u5b9a\u7fa9\u3059\u308b\u4ed5\u7d44\u307f\u3002\u4f8b\u3048\u3070\u66dc\u65e5\u306a\u3089 MONDAY, TUESDAY, ..., SUNDAY \u306e7\u7a2e\u985e\u306e\u307f\u3002String\u578b\u3067\u306f\"monday\"\u3084\"Monday\"\u306a\u3069\u8868\u8a18\u63fa\u308c\u304c\u8d77\u304d\u308b\u304c\u3001enum\u306a\u3089\u5b9a\u7fa9\u3055\u308c\u305f\u5b9a\u6570\u3057\u304b\u4f7f\u3048\u306a\u3044\u305f\u3081\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8aa4\u308a\u3092\u691c\u51fa\u3067\u304d\u308b\u3002switch-case\u3068\u975e\u5e38\u306b\u76f8\u6027\u304c\u826f\u3044\u3002<\/p>\n<\/div>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ ===== enum\u306e\u5b9a\u7fa9 =====\npublic enum OrderStatus {\n    PENDING,    \/\/ \u6ce8\u6587\u53d7\u4ed8\u4e2d\n    PROCESSING, \/\/ \u51e6\u7406\u4e2d\n    SHIPPED,    \/\/ \u767a\u9001\u6e08\u307f\n    DELIVERED,  \/\/ \u914d\u9054\u5b8c\u4e86\n    CANCELLED   \/\/ \u30ad\u30e3\u30f3\u30bb\u30eb\n}\n\n\/\/ ===== enum\u3068switch-case\u306e\u7d44\u307f\u5408\u308f\u305b =====\npublic class OrderProcessor {\n    public void processOrder(OrderStatus status) {\n        switch (status) {\n            case PENDING:\n                System.out.println(\"\u5728\u5eab\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059...\");\n                checkInventory();\n                break;\n            case PROCESSING:\n                System.out.println(\"\u68b1\u5305\u3092\u958b\u59cb\u3057\u307e\u3059...\");\n                startPacking();\n                break;\n            case SHIPPED:\n                System.out.println(\"\u914d\u9001\u696d\u8005\u306b\u5f15\u304d\u6e21\u3057\u307e\u3057\u305f\");\n                notifyShipping();\n                break;\n            case DELIVERED:\n                System.out.println(\"\u914d\u9054\u304c\u5b8c\u4e86\u3057\u307e\u3057\u305f\");\n                sendDeliveryConfirmation();\n                break;\n            case CANCELLED:\n                System.out.println(\"\u6ce8\u6587\u3092\u30ad\u30e3\u30f3\u30bb\u30eb\u3057\u307e\u3057\u305f\");\n                processRefund();\n                break;\n            \/\/ default\u306fenum\u306e\u5834\u5408\u306f\u901a\u5e38\u4e0d\u8981\uff08\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u6f0f\u308c\u3092\u691c\u51fa\uff09\n        }\n    }\n}<\/pre>\n<\/div>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\">\n  <div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\">\n    <span style=\"font-size:18px;\">&#128161;<\/span>\n    <strong style=\"color:#16a34a;font-size:15px;\">enum\u306eswitch-case\u3067default\u3092\u7701\u7565\u3067\u304d\u308b\u7406\u7531<\/strong>\n  <\/div>\n  <p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">String\u578b\u3084\u6570\u5024\u578b\u306eswitch-case\u3067\u306fdefault\u304c\u306a\u3044\u3068\u4e88\u671f\u3057\u306a\u3044\u5024\u304c\u6765\u305f\u3068\u304d\u306b\u4f55\u3082\u51e6\u7406\u3055\u308c\u305a\u30d0\u30b0\u306b\u306a\u308a\u307e\u3059\u3002\u3057\u304b\u3057enum\u578b\u306eswitch-case\u3067\u306f\u3001\u3059\u3079\u3066\u306eenum\u5024\u3092case\u3067\u7db2\u7f85\u3057\u3066\u3044\u308c\u3070\u7406\u8ad6\u4e0adefault\u4e0d\u8981\u3067\u3059\u3002\u3055\u3089\u306b\u3001Java\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u8b66\u544a\u8a2d\u5b9a\u3084IDE\u306b\u3088\u3063\u3066\u306f\u300ccase\u304c\u6f0f\u308c\u3066\u3044\u308b\u300d\u3053\u3068\u3092\u6307\u6458\u3057\u3066\u304f\u308c\u307e\u3059\u3002Java14\u4ee5\u964d\u306eswitch\u5f0f\u3067\u306f\u6f0f\u308c\u304c\u3042\u308b\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ Java14\u4ee5\u964d\u306eswitch\u5f0f\u3067enum\u3092\u4f7f\u3046\uff08\u6700\u3082\u30e2\u30c0\u30f3\u306a\u66f8\u304d\u65b9\uff09\npublic class OrderProcessor {\n    public String getStatusMessage(OrderStatus status) {\n        return switch (status) {\n            case PENDING     -> \"\u6ce8\u6587\u53d7\u4ed8\u4e2d\";\n            case PROCESSING  -> \"\u51e6\u7406\u4e2d\";\n            case SHIPPED     -> \"\u767a\u9001\u6e08\u307f\";\n            case DELIVERED   -> \"\u914d\u9054\u5b8c\u4e86\";\n            case CANCELLED   -> \"\u30ad\u30e3\u30f3\u30bb\u30eb\u6e08\u307f\";\n            \/\/ enum\u306e\u5168\u5024\u3092\u7db2\u7f85\u3057\u3066\u3044\u308b\u305f\u3081default\u4e0d\u8981\uff08\u7db2\u7f85\u3055\u308c\u3066\u3044\u306a\u3044\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff09\n        };\n    }\n}<\/pre>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-switch-case&#038;blog_slug=cc-java-switch-case\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-java-switch-case&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-06\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">06<\/span>\n  <span class=\"section-label\" style=\"display:block;\">SWITCH EXPR<\/span>\n  <span class=\"section-title\" style=\"display:block;\">Java14\u4ee5\u964d\u306eswitch\u5f0f\uff08->\u8a18\u6cd5\u30fbyield\uff09<\/span>\n  <span class=\"section-desc\">\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u306a\u3057\u30fb\u5024\u3092\u8fd4\u305b\u308b\u30fb\u7c21\u6f54\u306a\u30e2\u30c0\u30f3Java\u69cb\u6587<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java14\u3067\u30d7\u30ec\u30d3\u30e5\u30fc\u306a\u3057\u306b\u6b63\u5f0f\u63a1\u7528\u3055\u308c\u305f<strong>switch\u5f0f<\/strong>\u306f\u3001\u5f93\u6765\u306eswitch\u6587\u3092\u5927\u5e45\u306b\u6539\u5584\u3057\u305f\u65b0\u3057\u3044\u69cb\u6587\u3067\u3059\u30023\u3064\u306e\u4e3b\u8981\u306a\u6539\u5584\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#fafafa;border-radius:8px;padding:16px 20px;margin:16px 0;border-left:4px solid #dc2626;\">\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u304c\u8d77\u304d\u306a\u3044<\/strong>\uff08->\u8a18\u6cd5\u3067\u306fbreak\u304c\u4e0d\u8981\uff09<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>\u5024\u3092\u8fd4\u305b\u308b<\/strong>\uff08\u5909\u6570\u306b\u4ee3\u5165\u3057\u305f\u308a\u3001return\u3067\u8fd4\u3057\u305f\u308a\u3067\u304d\u308b\uff09<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>\u7db2\u7f85\u6027\u30c1\u30a7\u30c3\u30af<\/strong>\uff08enum\u306e\u3059\u3079\u3066\u306e\u5024\u3092case\u3067\u51e6\u7406\u3057\u3066\u3044\u306a\u3044\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff09<\/span><\/div>\n\n<\/div>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>switch\u5f0f\uff08Switch Expression\uff09<\/strong>\uff1aJava14\u3067\u6b63\u5f0f\u63a1\u7528\u3055\u308c\u305fJava\u306e\u65b0\u69cb\u6587\u3002\u5f93\u6765\u306e\u300cswitch\u6587\uff08\u51e6\u7406\u3092\u5206\u5c90\u3055\u305b\u308b\uff09\u300d\u306b\u5bfe\u3057\u3066\u300cswitch\u5f0f\uff08\u5024\u3092\u8fd4\u3059\uff09\u300d\u3068\u3057\u3066\u6a5f\u80fd\u3059\u308b\u3002-> \u8a18\u6cd5\uff08\u30a2\u30ed\u30fc\u69cb\u6587\uff09\u3092\u4f7f\u3044\u3001case \u5024 -> \u5f0f\u3068\u3044\u3046\u5f62\u3067\u66f8\u304f\u3002break\u304c\u4e0d\u8981\u3067\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u304c\u8d77\u304d\u306a\u3044\u3002\u8907\u6570\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u30d6\u30ed\u30c3\u30af{}\u3092\u4f7f\u3044\u3001yield\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u5024\u3092\u8fd4\u3059\u3002<\/p>\n<\/div>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ ===== \u5f93\u6765\u306eswitch\u6587\uff08Java8\u4ee5\u524d\u306e\u66f8\u304d\u65b9\uff09=====\nString result;\nint month = 4;\nswitch (month) {\n    case 1: case 3: case 5: case 7: case 8: case 10: case 12:\n        result = \"31\u65e5\";\n        break;\n    case 4: case 6: case 9: case 11:\n        result = \"30\u65e5\";\n        break;\n    case 2:\n        result = \"28\/29\u65e5\";\n        break;\n    default:\n        result = \"\u4e0d\u660e\";\n        break;\n}\n\n\/\/ ===== Java14\u4ee5\u964d\u306eswitch\u5f0f\uff08->\u8a18\u6cd5\uff09=====\nString result14 = switch (month) {\n    case 1, 3, 5, 7, 8, 10, 12 -> \"31\u65e5\";   \/\/ \u30ab\u30f3\u30de\u533a\u5207\u308a\n    case 4, 6, 9, 11            -> \"30\u65e5\";\n    case 2                       -> \"28\/29\u65e5\";\n    default                      -> \"\u4e0d\u660e\";\n};\n\/\/ \u5727\u5012\u7684\u306b\u3059\u3063\u304d\u308a\u3057\u305f\uff01<\/pre>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">6-2. yield\u30ad\u30fc\u30ef\u30fc\u30c9\uff08\u8907\u6570\u884c\u306e\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>-><\/code>\u306e\u53f3\u8fba\u306b\u8907\u6570\u306e\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001<strong>\u30d6\u30ed\u30c3\u30af{}\u3092\u4f7f\u3044yield\u3067\u5024\u3092\u8fd4\u3059<\/strong>\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ yield\u3092\u4f7f\u3063\u3066\u8907\u6570\u884c\u51e6\u7406\u3092\u542b\u3080switch\u5f0f\nString description = switch (status) {\n    case PENDING -> {\n        log(\"\u6ce8\u6587\u3092\u53d7\u3051\u4ed8\u3051\u307e\u3057\u305f\");     \/\/ \u30ed\u30b0\u51fa\u529b\n        notifyAdmin();                   \/\/ \u901a\u77e5\n        yield \"\u53d7\u4ed8\u5b8c\u4e86\";                \/\/ yield\u3067\u5024\u3092\u8fd4\u3059\uff08return\u3067\u306f\u306a\u3044\uff09\n    }\n    case SHIPPED -> {\n        String trackingNo = generateTrackingNumber();\n        sendTrackingEmail(trackingNo);\n        yield \"\u767a\u9001\u6e08\u307f\uff08\u8ffd\u8de1\u756a\u53f7: \" + trackingNo + \")\";\n    }\n    default -> \"\u51e6\u7406\u4e2d\";  \/\/ 1\u884c\u306ecase\u306byield\u306f\u4e0d\u8981\n};<\/pre>\n<\/div>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\">\n  <p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p>\n  <p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>yield\u30ad\u30fc\u30ef\u30fc\u30c9<\/strong>\uff1aJava14\u3067\u8ffd\u52a0\u3055\u308c\u305f\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u3001switch\u5f0f\u306e\u30d6\u30ed\u30c3\u30af\uff08{}\uff09\u5185\u304b\u3089\u5024\u3092\u8fd4\u3059\u305f\u3081\u306b\u4f7f\u3046\u3002switch\u5f0f\u306e->\u53f3\u8fba\u304c\u30d6\u30ed\u30c3\u30af\u306e\u5834\u5408\u3001return\u3067\u306f\u306a\u304fyield\u3067\u5024\u3092\u6307\u5b9a\u3059\u308b\u3002return\u3092\u4f7f\u3046\u3068\u30e1\u30bd\u30c3\u30c9\u5168\u4f53\u304b\u3089\u306e\u8fd4\u308a\u5024\u3068\u306a\u308b\u305f\u3081\u533a\u5225\u304c\u91cd\u8981\u3002\u5f93\u6765\u306eswitch\u6587\uff08->\u3067\u306f\u306a\u304f:\u3092\u4f7f\u3046\u5834\u5408\uff09\u3067\u306fbreak\u306e\u4ee3\u308f\u308a\u306bbreak \u5024;\u3067\u3082\u5024\u3092\u8fd4\u305b\u308b\uff08\u305f\u3060\u3057->\u8a18\u6cd5\u306e\u65b9\u304c\u4e00\u822c\u7684\uff09\u3002<\/p>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-switch-case&#038;blog_slug=cc-java-switch-case\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-java-switch-case&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-07\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">07<\/span>\n  <span class=\"section-label\" style=\"display:block;\">COMMON ERRORS<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u3088\u304f\u3042\u308b\u30df\u30b9\u30fb\u30a8\u30e9\u30fc\u3068\u30c7\u30d0\u30c3\u30b0\u65b9\u6cd5<\/span>\n  <span class=\"section-desc\">switch-case\u3067\u8a70\u307e\u308b5\u3064\u306e\u3088\u304f\u3042\u308b\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/span>\n<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">7-1. break\u306e\u4ed8\u3051\u5fd8\u308c\uff08\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u524d\u8ff0\u306e\u901a\u308a\u6700\u591a\u306e\u30df\u30b9\u3067\u3059\u3002break\u306a\u3057\u306b\u3059\u308b\u3068\u4e88\u671f\u3057\u306a\u3044\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u30c7\u30d0\u30c3\u30b0\u65b9\u6cd5: <code>System.out.println(\"case X \u306b\u5165\u3063\u305f\");<\/code>\u3092\u5404case\u306b\u4e00\u6642\u7684\u306b\u8ffd\u52a0\u3057\u3066\u5b9f\u884c\u306e\u6d41\u308c\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7-2. String\u578b\u306e\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u30df\u30b9<\/h3>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ NG: \"Start\"\uff08\u5927\u6587\u5b57S\uff09\u3067\u306f \"start\"\uff08\u5c0f\u6587\u5b57\uff09\u306ecase\u306b\u30de\u30c3\u30c1\u3057\u306a\u3044\nString command = \"Start\";\nswitch (command) {\n    case \"start\":                  \/\/ \u2190 \"Start\" != \"start\" \u306a\u306e\u3067\u30b9\u30ad\u30c3\u30d7\n        System.out.println(\"\u958b\u59cb\");\n        break;\n}\n\n\/\/ OK: \u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u7d71\u4e00\u3057\u3066\u304b\u3089\u6bd4\u8f03\nswitch (command.toLowerCase()) {  \/\/ \u2190 toLowerCase()\u3067\u5c0f\u6587\u5b57\u306b\u7d71\u4e00\n    case \"start\":\n        System.out.println(\"\u958b\u59cb\");\n        break;\n}<\/pre>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">7-3. null\u304c\u6e21\u3055\u308c\u305f\u3068\u304d\u306eNullPointerException<\/h3>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ NG: command\u306bnull\u304c\u5165\u308b\u3068NullPointerException\u304c\u767a\u751f\nString command = null;\nswitch (command) {  \/\/ \u2190 NullPointerException!\n    case \"start\": break;\n}\n\n\/\/ OK: null\u30c1\u30a7\u30c3\u30af\u3092\u5148\u306b\u884c\u3046\nif (command == null) {\n    System.out.println(\"\u30b3\u30de\u30f3\u30c9\u304cnull\u3067\u3059\");\n} else {\n    switch (command) {\n        case \"start\": break;\n    }\n}<\/pre>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">7-4. case\u5185\u3067\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u3068\u5225\u306ecase\u304b\u3089\u53c2\u7167\u3067\u304d\u306a\u3044\u554f\u984c<\/h3>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ NG: case\u5185\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u3092\u5225\u306ecase\u304b\u3089\u53c2\u7167\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\nswitch (x) {\n    case 1:\n        int y = 10;    \/\/ \u3053\u3053\u3067\u5ba3\u8a00\n        break;\n    case 2:\n        System.out.println(y);  \/\/ \u2190 \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff08y\u304c\u5230\u9054\u53ef\u80fd\u304b\u3069\u3046\u304b\u4e0d\u660e\uff09\n        break;\n}\n\n\/\/ OK: switch\u5916\u3067y\u3092\u5ba3\u8a00\u3057\u3066\u304b\u3089case\u5185\u3067\u4ee3\u5165\nint y;\nswitch (x) {\n    case 1:\n        y = 10;\n        break;\n    case 2:\n        y = 20;\n        break;\n    default:\n        y = 0;\n}\nSystem.out.println(y);  \/\/ OK<\/pre>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">7-5. switch\u306e\u5f0f\u90e8\u5206\u306b\u4f7f\u3048\u306a\u3044\u578b\u306e\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/h3>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ NG: float\u3084double\u3001long\u306fswitch\u6587\u3067\u306f\u4f7f\u3048\u306a\u3044\uff08Java14\u4ee5\u964d\u3082\u540c\u69d8\uff09\nfloat f = 1.5f;\nswitch (f) {  \/\/ \u2190 \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc: float\u306fswitch\u6587\u3067\u4f7f\u3048\u306a\u3044\n    case 1.5f: break;\n}\n\n\/\/ OK: int\u306b\u30ad\u30e3\u30b9\u30c8\uff08\u7cbe\u5ea6\u306b\u6ce8\u610f\uff09\nswitch ((int) f) {\n    case 1: break;\n    case 2: break;\n}<\/pre>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-switch-case&#038;blog_slug=cc-java-switch-case\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-java-switch-case&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-08\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">08<\/span>\n  <span class=\"section-label\" style=\"display:block;\">USE CASES<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u5b9f\u52d9\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u5225\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30b3\u30fc\u30c9\u96c6<\/span>\n  <span class=\"section-desc\">\u30e1\u30cb\u30e5\u30fc\u9078\u629e\u30fb\u72b6\u614b\u9077\u79fb\u30fb\u30b3\u30de\u30f3\u30c9\u51e6\u7406\u306a\u3069\u5b9f\u52d9\u3067\u4f7f\u3046\u30d1\u30bf\u30fc\u30f3<\/span>\n<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">8-1. CLI\u30e1\u30cb\u30e5\u30fc\u9078\u629e\u306e\u51e6\u7406<\/h3>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">import java.util.Scanner;\n\npublic class MenuApp {\n    public static void main(String[] args) {\n        Scanner scanner = new Scanner(System.in);\n        System.out.println(\"\u9078\u629e\u3057\u3066\u304f\u3060\u3055\u3044: 1.\u4e00\u89a7 2.\u8ffd\u52a0 3.\u524a\u9664 0.\u7d42\u4e86\");\n        int choice = scanner.nextInt();\n\n        switch (choice) {\n            case 1:\n                showList();\n                break;\n            case 2:\n                addItem();\n                break;\n            case 3:\n                deleteItem();\n                break;\n            case 0:\n                System.out.println(\"\u7d42\u4e86\u3057\u307e\u3059\");\n                System.exit(0);\n                break;\n            default:\n                System.out.println(\"\u7121\u52b9\u306a\u9078\u629e\u3067\u3059: \" + choice);\n                break;\n        }\n    }\n}<\/pre>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">8-2. HTTP\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\u306b\u3088\u308b\u51e6\u7406\u5206\u5c90<\/h3>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">public class HttpResponseHandler {\n    public String handleStatusCode(int statusCode) {\n        return switch (statusCode) {\n            case 200 -> \"OK - \u30ea\u30af\u30a8\u30b9\u30c8\u6210\u529f\";\n            case 201 -> \"Created - \u30ea\u30bd\u30fc\u30b9\u4f5c\u6210\u6210\u529f\";\n            case 400 -> \"Bad Request - \u30ea\u30af\u30a8\u30b9\u30c8\u4e0d\u6b63\";\n            case 401 -> \"Unauthorized - \u8a8d\u8a3c\u304c\u5fc5\u8981\";\n            case 403 -> \"Forbidden - \u30a2\u30af\u30bb\u30b9\u6a29\u9650\u306a\u3057\";\n            case 404 -> \"Not Found - \u30ea\u30bd\u30fc\u30b9\u304c\u5b58\u5728\u3057\u306a\u3044\";\n            case 500 -> \"Internal Server Error - \u30b5\u30fc\u30d0\u30fc\u30a8\u30e9\u30fc\";\n            case 503 -> \"Service Unavailable - \u30b5\u30fc\u30d3\u30b9\u5229\u7528\u4e0d\u53ef\";\n            default  -> \"Unknown Status: \" + statusCode;\n        };\n    }\n}<\/pre>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">8-3. \u72b6\u614b\u9077\u79fb\u30de\u30b7\u30f3\uff08State Machine\uff09<\/h3>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\">\n  <pre style=\"margin:0;color:#d4d4d4;font-size:13px;line-height:1.8;font-family:'Consolas','Courier New',monospace;white-space:pre;\">\/\/ \u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u30e9\u30a4\u30c8\u306e\u72b6\u614b\u9077\u79fb\npublic enum TrafficLight { RED, YELLOW, GREEN }\n\npublic class TrafficController {\n    public TrafficLight nextState(TrafficLight current) {\n        return switch (current) {\n            case RED    -> TrafficLight.GREEN;\n            case GREEN  -> TrafficLight.YELLOW;\n            case YELLOW -> TrafficLight.RED;\n        };\n        \/\/ enum\u306e\u5168\u5024\u3092\u7db2\u7f85\u3057\u3066\u3044\u308b\u305f\u3081default\u4e0d\u8981\n        \/\/ \u7db2\u7f85\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff08Java14 switch\u5f0f\u306e\u5b89\u5168\u6027\uff09\n    }\n}<\/pre>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-switch-case&#038;blog_slug=cc-java-switch-case\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-java-switch-case&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-09\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">09<\/span>\n  <span class=\"section-label\" style=\"display:block;\">AI ASSIST<\/span>\n  <span class=\"section-title\" style=\"display:block;\">Claude Code\u3067Java switch-case\u3092\u81ea\u52d5\u751f\u6210\u3059\u308b<\/span>\n  <span class=\"section-desc\">enum\u306e\u5b9a\u7fa9\u304b\u3089switch\u5f0f\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u307e\u3067\u65e5\u672c\u8a9e\u6307\u793a\u3067\u5373\u5ea7\u306b\u751f\u6210<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u307e\u3067switch-case\u306e\u8a73\u7d30\u4ed5\u69d8\u30fb\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u7f60\u30fbJava14\u306e\u65b0\u69cb\u6587\u307e\u3067\u89e3\u8aac\u3057\u307e\u3057\u305f\u304c\u3001\u5b9f\u969b\u306b\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u5834\u9762\u3067\u300cenum\u306e\u8a2d\u8a08\u304b\u3089\u66f8\u304d\u76f4\u3059\u300d\u300cJava8\u5411\u3051\u306e\u30b3\u30fc\u30c9\u3092Java14+\u306eswitch\u5f0f\u306b\u66f8\u304d\u63db\u3048\u308b\u300d\u3068\u3044\u3063\u305f\u4f5c\u696d\u306f\u624b\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Claude Code<\/strong>\u306b\u300c\u3053\u3046\u3044\u3046\u51e6\u7406\u3092switch-case\u3067\u66f8\u304d\u305f\u3044\u300d\u3068\u65e5\u672c\u8a9e\u3067\u6307\u793a\u3059\u308b\u3060\u3051\u3067\u3001\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u5bfe\u7b56\u30fbenum\u8a2d\u8a08\u30fbJava14\u5bfe\u5fdc\u3092\u3059\u3079\u3066\u8003\u616e\u3057\u305f\u30b3\u30fc\u30c9\u304c\u5373\u5ea7\u306b\u8fd4\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<table>\n<thead><tr><th>\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/th><th>Claude Code\u3078\u306e\u6307\u793a\u4f8b<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u57fa\u672c\u7684\u306aswitch-case\u751f\u6210<\/td><td>\u300cJava\u3067\u6ce8\u6587\u30b9\u30c6\u30fc\u30bf\u30b9\uff08PENDING\/PROCESSING\/SHIPPED\/DELIVERED\/CANCELLED\uff09\u306b\u3088\u3063\u3066\u51e6\u7406\u3092\u5206\u5c90\u3059\u308bswitch-case\u3092\u66f8\u3044\u3066\u3002Java17\u5bfe\u5fdc\u3067\u3001enum\u3068switch\u5f0f\uff08->\u8a18\u6cd5\uff09\u3092\u4f7f\u3063\u3066\u300d<\/td><\/tr>\n<tr><td>\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u306e\u30e2\u30c0\u30f3\u5316<\/td><td>\u300c\u4ee5\u4e0b\u306eJava8\u306eswitch\u6587\u3092Java17\u306eswitch\u5f0f\uff08->\u8a18\u6cd5\uff09\u306b\u66f8\u304d\u76f4\u3057\u3066\u3002break\u306a\u3057\u306e\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u3092\u4f7f\u3063\u3066\u3044\u308b\u7b87\u6240\u3082\u5b89\u5168\u306b\u5909\u63db\u3057\u3066\u3002[\u30b3\u30fc\u30c9\u3092\u8cbc\u308a\u4ed8\u3051]\u300d<\/td><\/tr>\n<tr><td>enum + switch-case\u8a2d\u8a08<\/td><td>\u300cEC\u30b5\u30a4\u30c8\u306e\u6ce8\u6587\u30d5\u30ed\u30fc\u3092\u72b6\u614b\u9077\u79fb\u3068\u3057\u3066\u8a2d\u8a08\u3057\u305f\u3044\u3002\u72b6\u614b\u3092enum\u3067\u5b9a\u7fa9\u3057\u3066\u3001\u5404\u72b6\u614b\u304b\u3089\u306e\u9077\u79fb\u3092switch\u5f0f\u3067\u66f8\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u72b6\u614b: \u6ce8\u6587\u53d7\u4ed8\u2192\u652f\u6255\u3044\u5f85\u3061\u2192\u652f\u6255\u3044\u5b8c\u4e86\u2192\u767a\u9001\u6e96\u5099\u2192\u767a\u9001\u6e08\u307f\u2192\u914d\u9054\u5b8c\u4e86\u300d<\/td><\/tr>\n<tr><td>\u8907\u6570\u8a00\u8a9e\u5bfe\u5fdc<\/td><td>\u300c\u8a00\u8a9e\u30b3\u30fc\u30c9\uff08ja\/en\/zh\/ko\uff09\u3067\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u5207\u308a\u66ff\u3048\u308bJava\u306eswitch\u5f0f\u3092\u66f8\u3044\u3066\u3002Java14\u4ee5\u964d\u306e\u8a18\u6cd5\u3067\u3001\u305d\u308c\u4ee5\u5916\u306e\u8a00\u8a9e\u30b3\u30fc\u30c9\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u82f1\u8a9e\u3092\u4f7f\u3046\u300d<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<div class=\"g-flow-row\" style=\"margin:24px 0;\">\n  <div class=\"g-flow-item\"><strong>\u8981\u4ef6\u3092\u65e5\u672c\u8a9e\u3067\u8aac\u660e<\/strong><br><span style=\"font-size:12px;\">\u300c\u72b6\u614b\u9077\u79fb\u3092<br>switch\u5f0f\u3067\u66f8\u3044\u3066\u300d<\/span><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\"><strong>Claude Code\u304c\u751f\u6210<\/strong><br><span style=\"font-size:12px;\">enum\u5b9a\u7fa9+<br>switch\u5f0f\u3092\u542b\u3080<br>\u5b8c\u5168\u306a\u30b3\u30fc\u30c9<\/span><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\"><strong>IDE\u306b\u8cbc\u308a\u4ed8\u3051\u3066\u78ba\u8a8d<\/strong><br><span style=\"font-size:12px;\">\u30b3\u30f3\u30d1\u30a4\u30eb+<br>\u52d5\u4f5c\u78ba\u8a8d<\/span><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\"><strong>\u300cyield\u3092\u4f7f\u3046\u7248\u3082\u66f8\u3044\u3066\u300d\u7b49\u3092\u8ffd\u52a0\u6307\u793a<\/strong><br><span style=\"font-size:12px;\">\u3055\u3089\u306b\u6539\u5584\u30fb<br>\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u8ffd\u52a0<\/span><\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">Claude Code\u306bJava\u306eswitch-case\u3092\u66f8\u3044\u3066\u3082\u3089\u3046\u3068\u304d\u300cJava17\u5bfe\u5fdc\u306eswitch\u5f0f\u3067\u66f8\u3044\u3066\u3001enum\u306f\u5225\u30af\u30e9\u30b9\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3066\u300d\u3068\u5177\u4f53\u7684\u306a\u30d0\u30fc\u30b8\u30e7\u30f3\u3068\u30b9\u30bf\u30a4\u30eb\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u305d\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u9069\u3057\u305f\u30b3\u30fc\u30c9\u304c\u8fd4\u3063\u3066\u304d\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u65e2\u5b58\u306eJava8\u30b3\u30fc\u30c9\u3092Java17\u306b\u79fb\u884c\u3059\u308b\u969b\u306b\u3001\u300c\u3053\u306eswitch\u6587\u3092\u3059\u3079\u3066switch\u5f0f\u306b\u66f8\u304d\u63db\u3048\u3066\u3001break\u306a\u3057\u306e\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3053\u308d\u306f\u5b89\u5168\u306b\u5909\u63db\u3057\u3066\u300d\u3068Claude Code\u306b\u4e00\u62ec\u3067\u4f9d\u983c\u3059\u308b\u306e\u304c\u6700\u3082\u52b9\u7387\u7684\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-switch-case&#038;blog_slug=cc-java-switch-case\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-java-switch-case&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-10\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">10<\/span>\n  <span class=\"section-label\" style=\"display:block;\">CONCLUSION<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u307e\u3068\u3081\uff1aJava\u306eswitch-case\u5b8c\u5168\u7fd2\u5f97\u306e\u30dd\u30a4\u30f3\u30c8<\/span>\n  <span class=\"section-desc\">\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u5bfe\u7b56\u30fbswitch\u5f0f\u30fbenum\u8a2d\u8a08\u306e3\u70b9\u30bb\u30c3\u30c8<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#fafafa;border-radius:8px;padding:16px 20px;margin:16px 0;border-left:4px solid #dc2626;\">\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>switch-case\u306f<strong>1\u3064\u306e\u5909\u6570\u306e\u7b49\u5024\u6bd4\u8f03\u3092\u8907\u6570\u884c\u3046\u5834\u9762<\/strong>\u306b\u4f7f\u3046\uff08\u7bc4\u56f2\u6bd4\u8f03\u306fif-else\uff09<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>break\u7701\u7565\u306f\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc<\/strong>\u306e\u30d0\u30b0\u6e29\u5e8a\u3002\u5168case\u306b\u5fc5\u305abreak\u3092\u66f8\u304f\u7fd2\u6163\u3092<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>String\u578b\u306f<strong>\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3059\u308b<\/strong>\u3002toLowerCase()\u3067\u4e8b\u524d\u7d71\u4e00\u304c\u5b89\u5168<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>null\u6e21\u3057\u3067NullPointerException<\/strong>\u304c\u8d77\u304d\u308b\u3002\u4e8b\u524d\u306bnull\u30c1\u30a7\u30c3\u30af\u304c\u5fc5\u8981<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>enum + switch-case<\/strong>\u306f\u73fe\u5834\u306eJava\u3067\u983b\u51fa\u3002\u578b\u5b89\u5168\u6027\u3068\u7db2\u7f85\u6027\u30c1\u30a7\u30c3\u30af\u306e\u6069\u6075\u3092\u53d7\u3051\u308b<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span><strong>Java14\u4ee5\u964d\u306eswitch\u5f0f\uff08->\u8a18\u6cd5\uff09<\/strong>\u306f\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u306a\u3057\u30fb\u5024\u3092\u8fd4\u305b\u308b\u30fb\u7c21\u6f54<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>Claude Code\u306b\u300cJava17\u5bfe\u5fdc\u306eswitch\u5f0f\u3067\u66f8\u3044\u3066\u300d\u3068\u6307\u793a\u3059\u308c\u3070<strong>\u5373\u5ea7\u306b\u5b89\u5168\u306a\u30b3\u30fc\u30c9\u304c\u5f97\u3089\u308c\u308b<\/strong><\/span><\/div>\n\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Java\u3084Python\u3092\u4f7f\u3063\u305f\u696d\u52d9\u30b7\u30b9\u30c6\u30e0\u306eAI\u6d3b\u7528\u30fb\u81ea\u52d5\u5316\u3092\u9032\u3081\u305f\u3044\u65b9\u3078<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306e\u6587\u6cd5\u3092\u899a\u3048\u308b\u3053\u3068\u3088\u308a\u3001\u696d\u52d9\u3067\u305d\u308c\u3092\u4f7f\u3063\u3066\u4f55\u3092\u81ea\u52d5\u5316\u3059\u308b\u304b\u306e\u65b9\u304c\u4fa1\u5024\u304c\u3042\u308a\u307e\u3059\u3002<br>AI\u9b3c\u7ba1\u7406\u3067\u306f\u3001Java\u3092\u542b\u3080\u696d\u52d9\u30b7\u30b9\u30c6\u30e0\u306eAI\u7d44\u307f\u8fbc\u307f\u30fb\u81ea\u52d5\u5316\u8a2d\u8a08\u3092\u652f\u63f4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u300cJava\u306e\u30b3\u30fc\u30c9\u306f\u66f8\u3051\u308b\u3051\u308c\u3069\u3001\u3069\u3053\u3092AI\u306b\u4efb\u305b\u308c\u3070\u3044\u3044\u304b\u304c\u5206\u304b\u3089\u306a\u3044\u300d\u3068\u3044\u3046\u76f8\u8ac7\u3082\u591a\u3044\u3067\u3059\u3002\u696d\u52d9\u30d5\u30ed\u30fc\u306e\u6574\u7406\u304b\u3089\u81ea\u52d5\u5316\u306e\u8a2d\u8a08\u307e\u3067\u4e00\u7dd2\u306b\u9032\u3081\u307e\u3059\u3002\u307e\u305a\u306f\u7121\u6599\u76f8\u8ac7\u3067\u304a\u6c17\u8efd\u306b\u3069\u3046\u305e\u3002<\/div>\n<\/div>\n\n\n\n<div style=\"background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);border-radius:16px;padding:36px 32px;margin:48px 0 16px;color:#fff;\">\n  <p style=\"font-size:13px;font-weight:700;color:#dc2626;letter-spacing:2px;margin:0 0 12px;\">NEXT STEP<\/p>\n  <p style=\"font-size:22px;font-weight:800;line-height:1.5;margin:0 0 20px;\">\u3053\u306e\u8a18\u4e8b\u306e\u5185\u5bb9\u3092\u3001\u3042\u306a\u305f\u306e\u30d3\u30b8\u30cd\u30b9\u3067<br>\u5b9f\u8df5\u3057\u3066\u307f\u307e\u305b\u3093\u304b\uff1f<\/p>\n  <div style=\"background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.12);border-radius:12px;padding:24px;max-width:560px;margin:0 auto;\">\n    <p style=\"font-size:13px;color:#dc2626;font-weight:700;margin:0 0 8px;\">AI\u6d3b\u7528\u3092\u81ea\u793e\u3067\u56de\u305b\u308b\u3088\u3046\u306b\u306a\u308a\u305f\u3044\u65b9\u3078<\/p>\n    <p style=\"font-size:20px;font-weight:800;margin:0 0 12px;\">AI\u9b3c\u7ba1\u7406<\/p>\n    <p style=\"font-size:14px;color:rgba(255,255,255,0.75);margin:0 0 20px;line-height:1.7;\">Claude Code\u30fbCowork\u5c0e\u5165\u652f\u63f4\u304b\u3089\u696d\u52d9\u8a2d\u8a08\u30fb\u793e\u5185\u6d78\u900f\u307e\u3067\u5b9f\u8df5\u30d9\u30fc\u30b9\u3067\u4f34\u8d70\u3002\u300c\u81ea\u793e\u3067\u56de\u305b\u308b\u7d44\u7e54\u300d\u309290\u65e5\u3067\u4f5c\u308b\u7d4c\u55b6\u8005\u5411\u3051\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3002<\/p>\n    <div style=\"text-align:center;\">\n      <a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&utm_medium=article&utm_campaign=cc-java-switch-case&utm_content=next-step-cta\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-block;background:#dc2626;color:#fff;font-weight:700;font-size:15px;padding:14px 32px;border-radius:30px;text-decoration:none;\">AI\u9b3c\u7ba1\u7406\u3092\u8a73\u3057\u304f\u898b\u308b \u2192<\/a>\n    <\/div>\n  <\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Q. Java switch-case\u3068if-else\u306f\u3069\u3061\u3089\u304c\u901f\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u5927\u91cf\u306e\u7b49\u5024\u6bd4\u8f03\uff0810\u500b\u4ee5\u4e0a\u306e\u6761\u4ef6\u304c\u3042\u308b\u5834\u5408\u306a\u3069\uff09\u3067\u306f\u3001switch-case\u304cif-else\u3088\u308a\u9ad8\u901f\u306b\u306a\u308b\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002Java\u30b3\u30f3\u30d1\u30a4\u30e9\u306fswitch-case\u3092\u5185\u90e8\u3067lookupswitch\uff08\u7dda\u5f62\u63a2\u7d22\uff09\u307e\u305f\u306ftableswitch\uff08\u914d\u5217\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u53c2\u7167\uff09\u306e\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u306b\u6700\u9069\u5316\u3057\u307e\u3059\u3002\u7279\u306b\u9023\u7d9a\u3057\u305f\u6574\u6570\u5024\u306ecase\uff081,2,3,...\uff09\u3067\u306ftableswitch\u304c\u4f7f\u308f\u308c\u3001O(1)\u306e\u5b9a\u6570\u6642\u9593\u3067\u5206\u5c90\u5148\u3092\u6c7a\u5b9a\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u300110\u500b\u672a\u6e80\u306e\u6761\u4ef6\u3067\u306fif-else\u3068\u306e\u5dee\u306f\u307b\u307c\u3042\u308a\u307e\u305b\u3093\u3002\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3092\u512a\u5148\u3057\u3066\u9078\u629e\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u554f\u984c\u306b\u306a\u3063\u3066\u304b\u3089\u6700\u9069\u5316\u3092\u691c\u8a0e\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. Java switch-case\u3067float\u3084double\u304c\u4f7f\u3048\u306a\u3044\u306e\u306f\u306a\u305c\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\uff08float\u30fbdouble\uff09\u306f\u5185\u90e8\u8868\u73fe\u306e\u8aa4\u5dee\u554f\u984c\u304b\u3089\u300c\u5b8c\u5168\u306a\u7b49\u5024\u6bd4\u8f03\u300d\u304c\u4fdd\u8a3c\u3067\u304d\u306a\u3044\u305f\u3081\u3067\u3059\u3002\u4f8b\u3048\u30700.1 + 0.2 == 0.3\u304cfalse\u306b\u306a\u308b\u306e\u306f\u6709\u540d\u306a\u4f8b\u3067\u3059\u3002switch-case\u306f\u7b49\u5024\u6bd4\u8f03\u3092\u524d\u63d0\u3068\u3059\u308b\u69cb\u6587\u306e\u305f\u3081\u3001\u8aa4\u5dee\u304c\u751f\u3058\u3046\u308b\u578b\u306f\u6392\u9664\u3055\u308c\u3066\u3044\u307e\u3059\u3002float\/double\u306e\u6bd4\u8f03\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f if (Math.abs(f - 0.5) < 1e-9) { ... } \u306e\u3088\u3046\u306a\u95be\u5024\u3092\u4f7f\u3063\u305f\u6bd4\u8f03\u3092if-else\u3067\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. Java14\u306eswitch\u5f0f\u306f\u3069\u306eJava\u30d0\u30fc\u30b8\u30e7\u30f3\u304b\u3089\u4f7f\u3048\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. switch\u5f0f\u306e->\u8a18\u6cd5\u306fJava12\u30fb13\u3067\u30d7\u30ec\u30d3\u30e5\u30fc\u6a5f\u80fd\u3068\u3057\u3066\u8ffd\u52a0\u3055\u308c\u3001Java14\u3067\u6b63\u5f0f\u63a1\u7528\u3055\u308c\u307e\u3057\u305f\u3002Java14\u4ee5\u964d\uff08Java14, 15, 16, 17, 21\u7b49\uff09\u3067\u3042\u308c\u3070--enable-preview\u30d5\u30e9\u30b0\u306a\u3057\u3067\u4f7f\u3048\u307e\u3059\u3002\u73fe\u5728\u306eLTS\uff08\u9577\u671f\u30b5\u30dd\u30fc\u30c8\uff09\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3042\u308bJava17\u30fbJava21\u306f\u3069\u3061\u3089\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001Java8\u30fbJava11\u3092\u4f7f\u3044\u7d9a\u3051\u3066\u3044\u308b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u5f93\u6765\u306eswitch\u6587\u3092\u4f7f\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. Java\u306eswitch-case\u3067enum\u3092\u4f7f\u3046\u3068\u4f55\u304c\u826f\u3044\u306e\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. String\u578b\u3084\u6570\u5024\u3067switch-case\u3092\u66f8\u304f\u3068\u3001\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u5024\uff08\u30bf\u30a4\u30dd\u3001\u60f3\u5b9a\u5916\u306e\u5165\u529b\u7b49\uff09\u304c\u6765\u3066\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u3089\u305adefault\u306b\u843d\u3061\u308b\u3060\u3051\u3067\u3059\u3002\u4e00\u65b9\u3001enum\u578b\u306eswitch-case\u3067\u306f\u3001\u2460\u30b3\u30f3\u30d1\u30a4\u30e9\u304cenum\u5024\u3092\u89e3\u6790\u3057\u3066\u5168\u3066\u7db2\u7f85\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3067\u304d\u308b\u3001\u2461Java14\u4ee5\u964d\u306eswitch\u5f0f\u3067\u306fenum\u306e\u5168\u5024\u3092\u7db2\u7f85\u3057\u306a\u3044\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\uff08default\u3092\u7701\u7565\u53ef\u80fd\uff09\u3001\u2462IDE\u304c\u672a\u51e6\u7406\u306ecase\u3092\u8b66\u544a\u3057\u3066\u304f\u308c\u308b\u3001\u3068\u3044\u3046\u5b89\u5168\u6027\u306e\u6069\u6075\u304c\u3042\u308a\u307e\u3059\u3002\u73fe\u5834\u306eJava\u3067\u306fswitch + enum\u306f\u5b9a\u77f3\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. yield\u3068return\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. return\u306f\u30e1\u30bd\u30c3\u30c9\u5168\u4f53\u304b\u3089\u306e\u623b\u308a\u5024\u3092\u8fd4\u3057\u3066\u30e1\u30bd\u30c3\u30c9\u3092\u7d42\u4e86\u3057\u307e\u3059\u304c\u3001yield\u306fswitch\u5f0f\u306e\u30d6\u30ed\u30c3\u30af\uff08{}\uff09\u5185\u304b\u3089\u5024\u3092\u8fd4\u3057\u3066switch\u5f0f\u306e\u8a55\u4fa1\u3092\u5b8c\u4e86\u3057\u307e\u3059\u3002switch\u5f0f\u304c\u30e1\u30bd\u30c3\u30c9\u5185\u306e\u9014\u4e2d\u306b\u3042\u308b\u5834\u5408\u3001yield\u306fswitch\u5f0f\u306e\u7d50\u679c\u5024\u3092\u78ba\u5b9a\u3055\u305b\u308b\u3060\u3051\u3067\u3001\u30e1\u30bd\u30c3\u30c9\u306f\u305d\u306e\u5f8c\u3082\u7d9a\u304d\u307e\u3059\u3002\u9006\u306b\u8a00\u3046\u3068\u3001switch\u5f0f\u306e\u30d6\u30ed\u30c3\u30af\u5185\u3067return\u3092\u4f7f\u3046\u3068\u3001switch\u5f0f\u306e\u7d50\u679c\u3092\u8fd4\u3059\u306e\u3067\u306f\u306a\u304f\u30e1\u30bd\u30c3\u30c9\u5168\u4f53\u3092\u7d42\u4e86\u3055\u305b\u3066\u3057\u307e\u3046\u305f\u3081\u3001\u610f\u56f3\u3057\u305f\u52d5\u4f5c\u306b\u306a\u3089\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. Claude Code\u3067Java switch-case\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3082\u3089\u3046\u3068\u304d\u3001\u3069\u3046\u6307\u793a\u3059\u308b\u3068\u826f\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u2460\u4f7f\u3046Java\u30d0\u30fc\u30b8\u30e7\u30f3\uff08Java8\/11\/17\/21\u7b49\uff09\u3001\u2461\u5206\u5c90\u3055\u305b\u305f\u3044\u5024\u306e\u578b\uff08int\/String\/enum\uff09\u3068\u5024\u306e\u4e00\u89a7\u3001\u2462\u5404case\u3067\u4f55\u3092\u3057\u305f\u3044\u304b\uff08\u51e6\u7406\u5185\u5bb9\u307e\u305f\u306freturn\u3059\u308b\u5024\uff09\u3001\u2463switch\u6587\uff08\u51e6\u7406\uff09\u304bswitch\u5f0f\uff08\u5024\u3092\u8fd4\u3059\uff09\u304b\u3001\u306e4\u70b9\u3092\u6307\u5b9a\u3059\u308b\u3068\u6700\u3082\u6b63\u78ba\u306a\u30b3\u30fc\u30c9\u304c\u5f97\u3089\u308c\u307e\u3059\u3002\u4f8b\uff1a\u300cJava17\u3001\u6ce8\u6587\u30b9\u30c6\u30fc\u30bf\u30b9\u306eenum\uff08PENDING\/PROCESSING\/SHIPPED\/DELIVERED\/CANCELLED\uff09\u3001\u5404\u30b9\u30c6\u30fc\u30bf\u30b9\u306b\u5bfe\u5fdc\u3059\u308b\u65e5\u672c\u8a9e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092String\u3067\u8fd4\u3059\u3001switch\u5f0f\u306e->\u8a18\u6cd5\u3067\u66f8\u3044\u3066\u300d\u3068\u3044\u3046\u5f62\u3067\u3059\u3002<\/p>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Java switch-case\u3068if-else\u306f\u3069\u3061\u3089\u304c\u901f\u3044\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u5927\u91cf\u306e\u7b49\u5024\u6bd4\u8f03\uff0810\u500b\u4ee5\u4e0a\u306e\u6761\u4ef6\u304c\u3042\u308b\u5834\u5408\u306a\u3069\uff09\u3067\u306f\u3001switch-case\u304cif-else\u3088\u308a\u9ad8\u901f\u306b\u306a\u308b\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002Java\u30b3\u30f3\u30d1\u30a4\u30e9\u306fswitch-case\u3092\u5185\u90e8\u3067lookupswitch\uff08\u7dda\u5f62\u63a2\u7d22\uff09\u307e\u305f\u306ftableswitch\uff08\u914d\u5217\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u53c2\u7167\uff09\u306e\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u306b\u6700\u9069\u5316\u3057\u307e\u3059\u3002\u7279\u306b\u9023\u7d9a\u3057\u305f\u6574\u6570\u5024\u306ecase\uff081,2,3,...\uff09\u3067\u306ftableswitch\u304c\u4f7f\u308f\u308c\u3001O(1)\u306e\u5b9a\u6570\u6642\u9593\u3067\u5206\u5c90\u5148\u3092\u6c7a\u5b9a\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u300110\u500b\u672a\u6e80\u306e\u6761\u4ef6\u3067\u306fif-else\u3068\u306e\u5dee\u306f\u307b\u307c\u3042\u308a\u307e\u305b\u3093\u3002\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3092\u512a\u5148\u3057\u3066\u9078\u629e\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u554f\u984c\u306b\u306a\u3063\u3066\u304b\u3089\u6700\u9069\u5316\u3092\u691c\u8a0e\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Java switch-case\u3067float\u3084double\u304c\u4f7f\u3048\u306a\u3044\u306e\u306f\u306a\u305c\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\uff08float\u30fbdouble\uff09\u306f\u5185\u90e8\u8868\u73fe\u306e\u8aa4\u5dee\u554f\u984c\u304b\u3089\u300c\u5b8c\u5168\u306a\u7b49\u5024\u6bd4\u8f03\u300d\u304c\u4fdd\u8a3c\u3067\u304d\u306a\u3044\u305f\u3081\u3067\u3059\u3002\u4f8b\u3048\u30700.1 + 0.2 == 0.3\u304cfalse\u306b\u306a\u308b\u306e\u306f\u6709\u540d\u306a\u4f8b\u3067\u3059\u3002switch-case\u306f\u7b49\u5024\u6bd4\u8f03\u3092\u524d\u63d0\u3068\u3059\u308b\u69cb\u6587\u306e\u305f\u3081\u3001\u8aa4\u5dee\u304c\u751f\u3058\u3046\u308b\u578b\u306f\u6392\u9664\u3055\u308c\u3066\u3044\u307e\u3059\u3002float\/double\u306e\u6bd4\u8f03\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f if (Math.abs(f - 0.5) < 1e-9) { ... } \u306e\u3088\u3046\u306a\u95be\u5024\u3092\u4f7f\u3063\u305f\u6bd4\u8f03\u3092if-else\u3067\u884c\u3044\u307e\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Java14\u306eswitch\u5f0f\u306f\u3069\u306eJava\u30d0\u30fc\u30b8\u30e7\u30f3\u304b\u3089\u4f7f\u3048\u307e\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"switch\u5f0f\u306e->\u8a18\u6cd5\u306fJava12\u30fb13\u3067\u30d7\u30ec\u30d3\u30e5\u30fc\u6a5f\u80fd\u3068\u3057\u3066\u8ffd\u52a0\u3055\u308c\u3001Java14\u3067\u6b63\u5f0f\u63a1\u7528\u3055\u308c\u307e\u3057\u305f\u3002Java14\u4ee5\u964d\uff08Java14, 15, 16, 17, 21\u7b49\uff09\u3067\u3042\u308c\u3070--enable-preview\u30d5\u30e9\u30b0\u306a\u3057\u3067\u4f7f\u3048\u307e\u3059\u3002\u73fe\u5728\u306eLTS\uff08\u9577\u671f\u30b5\u30dd\u30fc\u30c8\uff09\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3042\u308bJava17\u30fbJava21\u306f\u3069\u3061\u3089\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001Java8\u30fbJava11\u3092\u4f7f\u3044\u7d9a\u3051\u3066\u3044\u308b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u5f93\u6765\u306eswitch\u6587\u3092\u4f7f\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Java\u306eswitch-case\u3067enum\u3092\u4f7f\u3046\u3068\u4f55\u304c\u826f\u3044\u306e\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"String\u578b\u3084\u6570\u5024\u3067switch-case\u3092\u66f8\u304f\u3068\u3001\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u5024\uff08\u30bf\u30a4\u30dd\u3001\u60f3\u5b9a\u5916\u306e\u5165\u529b\u7b49\uff09\u304c\u6765\u3066\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u3089\u305adefault\u306b\u843d\u3061\u308b\u3060\u3051\u3067\u3059\u3002\u4e00\u65b9\u3001enum\u578b\u306eswitch-case\u3067\u306f\u3001\u2460\u30b3\u30f3\u30d1\u30a4\u30e9\u304cenum\u5024\u3092\u89e3\u6790\u3057\u3066\u5168\u3066\u7db2\u7f85\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3067\u304d\u308b\u3001\u2461Java14\u4ee5\u964d\u306eswitch\u5f0f\u3067\u306fenum\u306e\u5168\u5024\u3092\u7db2\u7f85\u3057\u306a\u3044\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\uff08default\u3092\u7701\u7565\u53ef\u80fd\uff09\u3001\u2462IDE\u304c\u672a\u51e6\u7406\u306ecase\u3092\u8b66\u544a\u3057\u3066\u304f\u308c\u308b\u3001\u3068\u3044\u3046\u5b89\u5168\u6027\u306e\u6069\u6075\u304c\u3042\u308a\u307e\u3059\u3002\u73fe\u5834\u306eJava\u3067\u306fswitch + enum\u306f\u5b9a\u77f3\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"yield\u3068return\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"return\u306f\u30e1\u30bd\u30c3\u30c9\u5168\u4f53\u304b\u3089\u306e\u623b\u308a\u5024\u3092\u8fd4\u3057\u3066\u30e1\u30bd\u30c3\u30c9\u3092\u7d42\u4e86\u3057\u307e\u3059\u304c\u3001yield\u306fswitch\u5f0f\u306e\u30d6\u30ed\u30c3\u30af\uff08{}\uff09\u5185\u304b\u3089\u5024\u3092\u8fd4\u3057\u3066switch\u5f0f\u306e\u8a55\u4fa1\u3092\u5b8c\u4e86\u3057\u307e\u3059\u3002switch\u5f0f\u304c\u30e1\u30bd\u30c3\u30c9\u5185\u306e\u9014\u4e2d\u306b\u3042\u308b\u5834\u5408\u3001yield\u306fswitch\u5f0f\u306e\u7d50\u679c\u5024\u3092\u78ba\u5b9a\u3055\u305b\u308b\u3060\u3051\u3067\u3001\u30e1\u30bd\u30c3\u30c9\u306f\u305d\u306e\u5f8c\u3082\u7d9a\u304d\u307e\u3059\u3002\u9006\u306b\u8a00\u3046\u3068\u3001switch\u5f0f\u306e\u30d6\u30ed\u30c3\u30af\u5185\u3067return\u3092\u4f7f\u3046\u3068\u3001switch\u5f0f\u306e\u7d50\u679c\u3092\u8fd4\u3059\u306e\u3067\u306f\u306a\u304f\u30e1\u30bd\u30c3\u30c9\u5168\u4f53\u3092\u7d42\u4e86\u3055\u305b\u3066\u3057\u307e\u3046\u305f\u3081\u3001\u610f\u56f3\u3057\u305f\u52d5\u4f5c\u306b\u306a\u3089\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Claude Code\u3067Java switch-case\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3082\u3089\u3046\u3068\u304d\u3001\u3069\u3046\u6307\u793a\u3059\u308b\u3068\u826f\u3044\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u2460\u4f7f\u3046Java\u30d0\u30fc\u30b8\u30e7\u30f3\uff08Java8\/11\/17\/21\u7b49\uff09\u3001\u2461\u5206\u5c90\u3055\u305b\u305f\u3044\u5024\u306e\u578b\uff08int\/String\/enum\uff09\u3068\u5024\u306e\u4e00\u89a7\u3001\u2462\u5404case\u3067\u4f55\u3092\u3057\u305f\u3044\u304b\uff08\u51e6\u7406\u5185\u5bb9\u307e\u305f\u306freturn\u3059\u308b\u5024\uff09\u3001\u2463switch\u6587\uff08\u51e6\u7406\uff09\u304bswitch\u5f0f\uff08\u5024\u3092\u8fd4\u3059\uff09\u304b\u3001\u306e4\u70b9\u3092\u6307\u5b9a\u3059\u308b\u3068\u6700\u3082\u6b63\u78ba\u306a\u30b3\u30fc\u30c9\u304c\u5f97\u3089\u308c\u307e\u3059\u3002\u4f8b\uff1a\u300cJava17\u3001\u6ce8\u6587\u30b9\u30c6\u30fc\u30bf\u30b9\u306eenum\uff08PENDING\/PROCESSING\/SHIPPED\/DELIVERED\/CANCELLED\uff09\u3001\u5404\u30b9\u30c6\u30fc\u30bf\u30b9\u306b\u5bfe\u5fdc\u3059\u308b\u65e5\u672c\u8a9e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092String\u3067\u8fd4\u3059\u3001switch\u5f0f\u306e->\u8a18\u6cd5\u3067\u66f8\u3044\u3066\u300d\u3068\u3044\u3046\u5f62\u3067\u3059\u3002\"\n      }\n    }\n  ]\n}\n<\/script>\n\n\n","protected":false},"excerpt":{"rendered":"<p>Java\u306eswitch-case\u6587\u3092\u5b8c\u5168\u89e3\u8aac\u3002\u57fa\u672c\u69cb\u6587\u30fbdefault\u306e\u4f7f\u3044\u65b9\u304b\u3089break\u7701\u7565\u306e\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u7f60\u30fbJava14\u4ee5\u964d\u306eswitch\u5f0f\uff08->\u8a18\u6cd5\uff09\u30fbenum\u578b\u306e\u5b9f\u52d9\u30d1\u30bf\u30fc\u30f3\u30fb\u3088\u304f\u3042\u308b\u30df\u30b9\u30fbClaude Code\u3067\u306e\u81ea\u52d5\u751f\u6210\u307e\u3067\u7db2\u7f85\u3002<\/p>\n","protected":false},"author":1,"featured_media":18436,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"sitemap_hide":"","_veu_custom_css":"","vkexunit_cta_each_option":"","footnotes":"","rank_math_description":"Java\u306eswitch-case\u6587\u3092\u5b8c\u5168\u89e3\u8aac\u3002\u57fa\u672c\u69cb\u6587\u30fbdefault\u306e\u4f7f\u3044\u65b9\u304b\u3089break\u7701\u7565\u306e\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u7f60\u30fbJava14\u4ee5\u964d\u306eswitch\u5f0f\uff08->\u8a18\u6cd5\uff09\u30fbenum\u578b\u306e\u5b9f\u52d9\u30d1\u30bf\u30fc\u30f3\u30fb\u3088\u304f\u3042\u308b\u30df\u30b9\u30fbClaude Code\u3067\u306e\u81ea\u52d5\u751f\u6210\u307e\u3067\u7db2\u7f85\u3002","rank_math_focus_keyword":"Java switch case \u4f7f\u3044\u65b9","rank_math_title":"\u30102026\u5e747\u6708\u6700\u65b0\u3011Java 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