{"id":15538,"date":"2026-07-14T05:49:22","date_gmt":"2026-07-13T20:49:22","guid":{"rendered":"https:\/\/genai-ai.co.jp\/ai-kanri\/?p=15538"},"modified":"2026-09-01T15:18:52","modified_gmt":"2026-09-01T06:18:52","slug":"cc-java-list-set","status":"publish","type":"post","link":"https:\/\/genai-ai.co.jp\/ai-kanri\/blog\/cc-java-list-set\/","title":{"rendered":"\u30102026\u5e748\u6708\u6700\u65b0\u3011Java\u306eList\u3068Set\u306e\u9055\u3044\u3092\u5b8c\u5168\u89e3\u8aac\uff01\u5909\u63db\u65b9\u6cd5\u30fb\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03\u30fbClaude Code\u3067\u306e\u81ea\u52d5\u5316\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-list-set.jpg\" alt=\"\u30102026\u5e747\u6708\u6700\u65b0\u3011Java\u306eList\u3068Set\u306e\u9055\u3044\u3092\u5b8c\u5168\u89e3\u8aac\uff01\u5909\u63db\u65b9\u6cd5\u30fb\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03\u30fbClaude Code\u3067\u306e\u81ea\u52d5\u5316\u307e\u3067\" style=\"width:100%;height:auto;border-radius:12px;display:block;\">\n<\/div>\n\n\n\n\n\n\n\n<p class=\"wp-block-paragraph\">\u300cJava\u3067List\u3068Set\u3069\u3063\u3061\u3092\u4f7f\u3048\u3070\u3044\u3044\u306e\uff1f\u300d\u300cList\u2192Set\u306e\u5909\u63db\u3063\u3066\u3069\u3046\u66f8\u304f\u306e\uff1f\u300d\u2014\u2014Java\u5165\u9580\u8005\u304c\u5fc5\u305a\u3064\u307e\u305a\u304f\u306e\u304cCollections\uff08\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\uff09\u306e\u4f7f\u3044\u5206\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<strong>Java\u306eList\u3068Set\u306e\u9055\u3044\u3092\u5fb9\u5e95\u7684\u306b\u89e3\u8aac<\/strong>\u3057\u307e\u3059\u3002\u57fa\u672c\u7684\u306a\u7279\u6027\u306e\u9055\u3044\u304b\u3089\u3001\u5b9f\u969b\u306e\u5909\u63db\u30b3\u30fc\u30c9\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5dee\u307e\u3067\u7db2\u7f85\u3057\u307e\u3059\u3002\u3055\u3089\u306b\u5f8c\u534a\u3067\u306f\u3001<strong>Claude Code\u306bJava\u30b3\u30fc\u30c9\u3092\u66f8\u304b\u305b\u308b\u5b9f\u8df5\u7684\u306a\u65b9\u6cd5<\/strong>\u3082\u7d39\u4ecb\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\">List\u3068Set\u306fJava\u306eCollection\uff08\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\uff09\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u4ee3\u8868\u7684\u306a2\u3064\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002\u300c\u3069\u3061\u3089\u3082\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\u5165\u308c\u308b\u305f\u3081\u306e\u7bb1\u300d\u3067\u3059\u304c\u3001\u4f7f\u3044\u5206\u3051\u3092\u9593\u9055\u3048\u308b\u3068\u4e88\u671f\u3057\u306a\u3044\u30d0\u30b0\u3084\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u554f\u984c\u304c\u8d77\u304d\u307e\u3059\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><strong>List\u3068Set<\/strong>\u306e3\u3064\u306e\u672c\u8cea\u7684\u306a\u9055\u3044\u304c\u7406\u89e3\u3067\u304d\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>ArrayList\u30fbLinkedList\u30fbHashSet\u30fbTreeSet<\/strong>\u306e\u4f7f\u3044\u5206\u3051\u304c\u660e\u78ba\u306b\u306a\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>List\u2192Set\u3001Set\u2192List<\/strong>\u306e4\u7a2e\u985e\u306e\u5909\u63db\u65b9\u6cd5\u304c\u308f\u304b\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>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/strong>\uff08\u8ffd\u52a0\u901f\u5ea6\u30fb\u691c\u7d22\u901f\u5ea6\uff09\u306e\u5dee\u304c\u6570\u5024\u3067\u308f\u304b\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>Claude Code<\/strong>\u3067Java\u30b3\u30fc\u30c9\u3092\u81ea\u52d5\u751f\u6210\u3059\u308b\u65b9\u6cd5\u304c\u308f\u304b\u308b<\/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\/aibpo\/makase\/blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=aibpo_makase\" target=\"_blank\" rel=\"noopener\" aria-label=\"AIBPO\uff08\u670830\u4e07\u5186\u3067\u696d\u52d9\u307e\u304b\u305b\u653e\u984c\uff09\u306e\u7121\u6599\u76f8\u8ac7 \u4e88\u7d04\u30da\u30fc\u30b8\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\/09\/cta_blog_aibpo_makase.jpg\" alt=\"AI BPO by AI\u9b3c\u7ba1\u7406\uff5c\u670830\u4e07\u5186\u306e\u5b9a\u984d\u3067\u5fa1\u793e\u306e\u696d\u52d9\u3092\u307e\u308b\u3054\u3068\u5dfb\u304d\u53d6\u308a\u307e\u3059\uff08\u7121\u6599\u76f8\u8ac760\u5206\uff09\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/koteihi-line\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=koteihi_shindan\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u516c\u5f0fLINE\u306e\u56fa\u5b9a\u8cbb\u524a\u6e1b\u8a3a\u65ad\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\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\/09\/cta_blog_koteihi_line.jpg\" alt=\"\u5fa1\u793e\u304c\u6e1b\u3089\u305b\u308b\u56fa\u5b9a\u8cbb\u306f\u6708\u3044\u304f\u3089\u304b\uff5c\u516c\u5f0fLINE\u3067\u8cea\u554f\u306b\u7b54\u3048\u308b\u3060\u3051\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\" 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;\">COLLECTIONS BASICS<\/span>\n  <span class=\"section-title\" style=\"display:block;\">Java\u306eList\u3068Set\u3068\u306f\u2014\u2014\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u57fa\u672c<\/span>\n  <span class=\"section-desc\">\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u30b3\u30f3\u30c6\u30ca\u306e2\u3064\u306e\u4ee3\u8868\u5f62\u614b<\/span>\n<\/h2>\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>Collection\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af<\/strong>\uff1aJava\u304c\u6a19\u6e96\u63d0\u4f9b\u3059\u308b\u300c\u8907\u6570\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u7ba1\u7406\u3059\u308b\u305f\u3081\u306e\u578b\u30fb\u30af\u30e9\u30b9\u7fa4\u300d\u3002java.util\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u542b\u307e\u308c\u308b\u3002List\u30fbSet\u30fbMap\u304c\u4ee3\u8868\u7684\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3002List\u306f\u9806\u5e8f\u4ed8\u304d\u30ea\u30b9\u30c8\u3001Set\u306f\u91cd\u8907\u306a\u3057\u96c6\u5408\u3001Map\u306f\u30ad\u30fc\u3068\u5024\u306e\u30da\u30a2\u3002<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Java\u306eList\u3068Set\u306f\u3001\u3069\u3061\u3089\u3082<strong>\u300c\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u300d<\/strong>\u3067\u3059\u304c\u3001\u30c7\u30fc\u30bf\u306e\u7ba1\u7406\u65b9\u6cd5\u304c\u6839\u672c\u7684\u306b\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<table>\n<thead><tr><th>\u6982\u5ff5<\/th><th>List<\/th><th>Set<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u30a4\u30e1\u30fc\u30b8<\/td><td>\u30ca\u30f3\u30d0\u30ea\u30f3\u30b0\u3055\u308c\u305f\u5217<\/td><td>\u91cd\u8907\u306a\u3057\u306e\u96c6\u5408<\/td><\/tr>\n<tr><td>\u82f1\u5358\u8a9e\u306e\u610f\u5473<\/td><td>\u4e00\u89a7\u30fb\u30ea\u30b9\u30c8\u30fb\u9806\u756a\u304c\u3042\u308b<\/td><td>\u96c6\u5408\uff08\u6570\u5b66\u7684\u306a\u610f\u5473\uff09<\/td><\/tr>\n<tr><td>\u91cd\u8907\u8981\u7d20<\/td><td>\u8a31\u5bb9\u3059\u308b<\/td><td>\u8a31\u5bb9\u3057\u306a\u3044\uff08\u81ea\u52d5\u7684\u306b\u9664\u53bb\uff09<\/td><\/tr>\n<tr><td>\u9806\u5e8f<\/td><td>\u5e38\u306b\u4fdd\u6301\u3055\u308c\u308b\uff08\u5165\u308c\u305f\u9806\u756a\uff09<\/td><td>\u5b9f\u88c5\u306b\u3088\u308b\uff08HashSet\u306f\u9806\u5e8f\u4fdd\u8a3c\u306a\u3057\uff09<\/td><\/tr>\n<tr><td>\u4e3b\u306a\u5b9f\u88c5\u30af\u30e9\u30b9<\/td><td>ArrayList, LinkedList<\/td><td>HashSet, TreeSet, LinkedHashSet<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u300c\u81ea\u5206\u304c\u7ba1\u7406\u3057\u305f\u3044\u30c7\u30fc\u30bf\u306b\u91cd\u8907\u306f\u3042\u308b\u304b\uff1f\u9806\u756a\u306f\u91cd\u8981\u304b\uff1f\u300d\u3068\u3044\u30462\u70b9\u3092\u78ba\u8a8d\u3059\u308b\u306e\u304c\u3001List\u3068Set\u3092\u9078\u3076\u305f\u3081\u306e\u51fa\u767a\u70b9\u3067\u3059\u3002<\/p>\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\/aibpo\/makase\/blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=aibpo_makase\" target=\"_blank\" rel=\"noopener\" aria-label=\"AIBPO\uff08\u670830\u4e07\u5186\u3067\u696d\u52d9\u307e\u304b\u305b\u653e\u984c\uff09\u306e\u7121\u6599\u76f8\u8ac7 \u4e88\u7d04\u30da\u30fc\u30b8\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\/09\/cta_blog_aibpo_makase.jpg\" alt=\"AI BPO by AI\u9b3c\u7ba1\u7406\uff5c\u670830\u4e07\u5186\u306e\u5b9a\u984d\u3067\u5fa1\u793e\u306e\u696d\u52d9\u3092\u307e\u308b\u3054\u3068\u5dfb\u304d\u53d6\u308a\u307e\u3059\uff08\u7121\u6599\u76f8\u8ac760\u5206\uff09\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/koteihi-line\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=koteihi_shindan\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u516c\u5f0fLINE\u306e\u56fa\u5b9a\u8cbb\u524a\u6e1b\u8a3a\u65ad\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\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\/09\/cta_blog_koteihi_line.jpg\" alt=\"\u5fa1\u793e\u304c\u6e1b\u3089\u305b\u308b\u56fa\u5b9a\u8cbb\u306f\u6708\u3044\u304f\u3089\u304b\uff5c\u516c\u5f0fLINE\u3067\u8cea\u554f\u306b\u7b54\u3048\u308b\u3060\u3051\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\" 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;\">KEY DIFFERENCES<\/span>\n  <span class=\"section-title\" style=\"display:block;\">List\u3068Set\u306e\u9055\u3044\u2014\u20143\u3064\u306e\u91cd\u8981\u306a\u5dee\u7570<\/span>\n  <span class=\"section-desc\">\u91cd\u8907\u30fb\u9806\u5e8f\u30fb\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e3\u8ef8\u3067\u7406\u89e3\u3059\u308b<\/span>\n<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">2-1. \u91cd\u8907\u306e\u6271\u3044\u2014\u2014\u6700\u5927\u306e\u9055\u3044<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">List\u3068Set\u3067\u6700\u3082\u91cd\u8981\u306a\u9055\u3044\u306f<strong>\u300c\u91cd\u8907\u30c7\u30fc\u30bf\u306e\u6271\u3044\u300d<\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">import java.util.*;\n\npublic class DuplicateDemo {\n    public static void main(String[] args) {\n        \/\/ List: \u91cd\u8907\u3092\u8a31\u5bb9\u3059\u308b\n        List&lt;String&gt; list = new ArrayList&lt;&gt;();\n        list.add(\"apple\");\n        list.add(\"banana\");\n        list.add(\"apple\"); \/\/ \u91cd\u8907\u3092\u8ffd\u52a0\n        System.out.println(list); \/\/ [apple, banana, apple] \u2190 \u5168\u3066\u4fdd\u6301\n\n        \/\/ Set: \u91cd\u8907\u3092\u81ea\u52d5\u9664\u53bb\n        Set&lt;String&gt; set = new HashSet&lt;&gt;();\n        set.add(\"apple\");\n        set.add(\"banana\");\n        set.add(\"apple\"); \/\/ \u91cd\u8907\u3092\u8ffd\u52a0\n        System.out.println(set); \/\/ [banana, apple] \u2190 apple\u306f1\u3064\u306e\u307f\n    }\n}<\/code><\/pre>\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;\">\u91cd\u8907\u9664\u53bb\u306e\u81ea\u52d5\u5316\u306bSet\u3092\u4f7f\u3046<\/strong>\n  <\/div>\n  <p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">Set\u306e\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u6d3b\u7528\u6cd5\u306f\u300c\u91cd\u8907\u30c7\u30fc\u30bf\u306e\u81ea\u52d5\u9664\u53bb\u300d\u3067\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304b\u3089\u53d6\u5f97\u3057\u305f\u30ea\u30b9\u30c8\u306b\u91cd\u8907\u304c\u542b\u307e\u308c\u308b\u5834\u5408\u3001List\u3092Set\u306b\u5909\u63db\u3059\u308b\u3060\u3051\u3067\u91cd\u8907\u3092\u4e00\u62ec\u9664\u53bb\u3067\u304d\u307e\u3059\u3002\uff08\u5f8c\u8ff0\u306e\u5909\u63db\u65b9\u6cd5\u3067\u89e3\u8aac\uff09<\/p>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">2-2. \u9806\u5e8f\u306e\u4fdd\u6301<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">List\u306f\u5e38\u306b\u8981\u7d20\u306e\u9806\u5e8f\u3092\u4fdd\u6301\u3057\u307e\u3059\u304c\u3001Set\u306e\u9806\u5e8f\u4fdd\u6301\u306f\u30af\u30e9\u30b9\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<table>\n<thead><tr><th>\u30af\u30e9\u30b9<\/th><th>\u9806\u5e8f<\/th><th>\u91cd\u8907<\/th><th>\u7279\u5fb4<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>ArrayList<\/td><td>\u633f\u5165\u9806\u3092\u4fdd\u6301<\/td><td>\u8a31\u5bb9<\/td><td>\u6700\u3082\u6c4e\u7528\u7684\u30fb\u30e9\u30f3\u30c0\u30e0\u30a2\u30af\u30bb\u30b9\u9ad8\u901f<\/td><\/tr>\n<tr><td>LinkedList<\/td><td>\u633f\u5165\u9806\u3092\u4fdd\u6301<\/td><td>\u8a31\u5bb9<\/td><td>\u5148\u982d\u30fb\u672b\u5c3e\u3078\u306e\u8ffd\u52a0\u30fb\u524a\u9664\u304c\u9ad8\u901f<\/td><\/tr>\n<tr><td>HashSet<\/td><td>\u4fdd\u8a3c\u306a\u3057<\/td><td>\u9664\u53bb<\/td><td>\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\u4f7f\u7528\u30fb\u691c\u7d22\u304c\u6700\u901f<\/td><\/tr>\n<tr><td>TreeSet<\/td><td>\u81ea\u7136\u9806\uff08\u30bd\u30fc\u30c8\u6e08\uff09<\/td><td>\u9664\u53bb<\/td><td>\u81ea\u52d5\u30bd\u30fc\u30c8\u30fb\u7bc4\u56f2\u691c\u7d22\u304c\u5f97\u610f<\/td><\/tr>\n<tr><td>LinkedHashSet<\/td><td>\u633f\u5165\u9806\u3092\u4fdd\u6301<\/td><td>\u9664\u53bb<\/td><td>\u91cd\u8907\u9664\u53bb\u3057\u306a\u304c\u3089\u9806\u5e8f\u3082\u4fdd\u6301\u3057\u305f\u3044\u5834\u5408<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<h3 class=\"wp-block-heading\">2-3. null\u306e\u6271\u3044<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">null\u306e\u53d6\u308a\u6271\u3044\u3082List\/Set\u3067\u7570\u306a\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">\/\/ ArrayList: null \u3092\u8907\u6570\u8ffd\u52a0\u3067\u304d\u308b\nList&lt;String&gt; list = new ArrayList&lt;&gt;();\nlist.add(null);\nlist.add(null);\nSystem.out.println(list.size()); \/\/ 2\n\n\/\/ HashSet: null \u306f1\u3064\u306e\u307f\uff08\u91cd\u8907\u9664\u53bb\u306e\u30eb\u30fc\u30eb\u306b\u5f93\u3046\uff09\nSet&lt;String&gt; hashSet = new HashSet&lt;&gt;();\nhashSet.add(null);\nhashSet.add(null);\nSystem.out.println(hashSet.size()); \/\/ 1\n\n\/\/ TreeSet: null \u3092\u8ffd\u52a0\u3059\u308b\u3068NullPointerException\nSet&lt;String&gt; treeSet = new TreeSet&lt;&gt;();\ntreeSet.add(null); \/\/ \u2190 NullPointerException!<\/code><\/pre>\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;\">TreeSet\u306bnull\u306f\u8ffd\u52a0\u7981\u6b62<\/strong>\n  <\/div>\n  <p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">TreeSet\u306f\u8981\u7d20\u3092\u30bd\u30fc\u30c8\u3059\u308b\u305f\u3081\u3001null\uff08\u30bd\u30fc\u30c8\u4e0d\u53ef\u80fd\uff09\u3092\u8ffd\u52a0\u3059\u308b\u3068NullPointerException\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u306bnull\u304c\u542b\u307e\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u306fTreeSet\u306f\u4f7f\u308f\u305a\u3001HashSet\u307e\u305f\u306fLinkedHashSet\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\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\/aibpo\/makase\/blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=aibpo_makase\" target=\"_blank\" rel=\"noopener\" aria-label=\"AIBPO\uff08\u670830\u4e07\u5186\u3067\u696d\u52d9\u307e\u304b\u305b\u653e\u984c\uff09\u306e\u7121\u6599\u76f8\u8ac7 \u4e88\u7d04\u30da\u30fc\u30b8\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\/09\/cta_blog_aibpo_makase.jpg\" alt=\"AI BPO by AI\u9b3c\u7ba1\u7406\uff5c\u670830\u4e07\u5186\u306e\u5b9a\u984d\u3067\u5fa1\u793e\u306e\u696d\u52d9\u3092\u307e\u308b\u3054\u3068\u5dfb\u304d\u53d6\u308a\u307e\u3059\uff08\u7121\u6599\u76f8\u8ac760\u5206\uff09\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/koteihi-line\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=koteihi_shindan\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u516c\u5f0fLINE\u306e\u56fa\u5b9a\u8cbb\u524a\u6e1b\u8a3a\u65ad\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\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\/09\/cta_blog_koteihi_line.jpg\" alt=\"\u5fa1\u793e\u304c\u6e1b\u3089\u305b\u308b\u56fa\u5b9a\u8cbb\u306f\u6708\u3044\u304f\u3089\u304b\uff5c\u516c\u5f0fLINE\u3067\u8cea\u554f\u306b\u7b54\u3048\u308b\u3060\u3051\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\" 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;\">ARRAYLIST<\/span>\n  <span class=\"section-title\" style=\"display:block;\">ArrayList\u306e\u4f7f\u3044\u65b9\u3068\u5b9f\u88c5\u4f8b<\/span>\n  <span class=\"section-desc\">List\u306e\u4ee3\u8868\u7684\u306a\u5b9f\u88c5\u2014\u2014\u6700\u3082\u57fa\u672c\u7684\u306a\u53ef\u5909\u9577\u914d\u5217<\/span>\n<\/h2>\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>ArrayList\uff08\u30a2\u30ec\u30a4\u30ea\u30b9\u30c8\uff09<\/strong>\uff1aList\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u6700\u3082\u4ee3\u8868\u7684\u306a\u5b9f\u88c5\u30af\u30e9\u30b9\u3002\u5185\u90e8\u7684\u306b\u914d\u5217\u3092\u4f7f\u3063\u3066\u8981\u7d20\u3092\u7ba1\u7406\u3057\u3001\u81ea\u52d5\u7684\u306b\u30b5\u30a4\u30ba\u304c\u62e1\u5f35\u3055\u308c\u308b\u300c\u53ef\u5909\u9577\u914d\u5217\u300d\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u3088\u308b\u30e9\u30f3\u30c0\u30e0\u30a2\u30af\u30bb\u30b9\uff08get(0)\u306a\u3069\uff09\u304c\u9ad8\u901f\u3002\u8981\u7d20\u306e\u8ffd\u52a0\u306f\u672b\u5c3e\u304c\u6700\u901f\u3001\u4e2d\u9593\u3078\u306e\u8ffd\u52a0\u30fb\u524a\u9664\u306f\u30b7\u30d5\u30c8\u304c\u767a\u751f\u3059\u308b\u305f\u3081\u9045\u304f\u306a\u308b\u3002<\/p>\n<\/div>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">import java.util.*;\n\npublic class ArrayListDemo {\n    public static void main(String[] args) {\n        \/\/ ArrayList\u306e\u4f5c\u6210\n        List&lt;String&gt; fruits = new ArrayList&lt;&gt;();\n\n        \/\/ \u8981\u7d20\u306e\u8ffd\u52a0\n        fruits.add(\"apple\");      \/\/ \u672b\u5c3e\u306b\u8ffd\u52a0\n        fruits.add(\"banana\");\n        fruits.add(\"cherry\");\n        fruits.add(1, \"grape\");   \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b91\u306b\u633f\u5165\n\n        System.out.println(fruits); \/\/ [apple, grape, banana, cherry]\n\n        \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30a2\u30af\u30bb\u30b9\n        System.out.println(fruits.get(0)); \/\/ apple\n        System.out.println(fruits.get(2)); \/\/ banana\n\n        \/\/ \u691c\u7d22\n        System.out.println(fruits.contains(\"banana\")); \/\/ true\n        System.out.println(fruits.indexOf(\"banana\"));  \/\/ 2\n\n        \/\/ \u524a\u9664\n        fruits.remove(\"banana\");  \/\/ \u5024\u3067\u524a\u9664\n        fruits.remove(0);          \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u524a\u9664\n\n        \/\/ \u30b5\u30a4\u30ba\n        System.out.println(fruits.size()); \/\/ 2\n\n        \/\/ \u30eb\u30fc\u30d7\uff08\u62e1\u5f35for\u6587\uff09\n        for (String fruit : fruits) {\n            System.out.println(fruit);\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3-1. ArrayList\u306e\u6d3b\u7528\u5834\u9762<\/h3>\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>\u9806\u756a\u304c\u91cd\u8981\u306a\u30c7\u30fc\u30bf<\/strong>\uff1a\u30e9\u30f3\u30ad\u30f3\u30b0\u30fb\u624b\u9806\u30ea\u30b9\u30c8\u30fb\u5c65\u6b74\u30c7\u30fc\u30bf<\/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>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30a2\u30af\u30bb\u30b9\u304c\u591a\u3044<\/strong>\uff1afruits.get(3) \u306e\u3088\u3046\u306a\u4f4d\u7f6e\u6307\u5b9a\u30a2\u30af\u30bb\u30b9<\/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>\u91cd\u8907\u3092\u6301\u3064\u30c7\u30fc\u30bf<\/strong>\uff1a\u540c\u3058\u5546\u54c1\u3092\u8907\u6570\u500b\u306e\u6ce8\u6587\u30ea\u30b9\u30c8<\/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>\u4e00\u822c\u7684\u306a\u300c\u30ea\u30b9\u30c8\u300d\u3068\u3057\u3066<\/strong>\uff1a\u7279\u5225\u306a\u8981\u4ef6\u304c\u306a\u3051\u308c\u3070ArrayList\u304c\u7121\u96e3<\/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\/aibpo\/makase\/blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=aibpo_makase\" target=\"_blank\" rel=\"noopener\" aria-label=\"AIBPO\uff08\u670830\u4e07\u5186\u3067\u696d\u52d9\u307e\u304b\u305b\u653e\u984c\uff09\u306e\u7121\u6599\u76f8\u8ac7 \u4e88\u7d04\u30da\u30fc\u30b8\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\/09\/cta_blog_aibpo_makase.jpg\" alt=\"AI BPO by AI\u9b3c\u7ba1\u7406\uff5c\u670830\u4e07\u5186\u306e\u5b9a\u984d\u3067\u5fa1\u793e\u306e\u696d\u52d9\u3092\u307e\u308b\u3054\u3068\u5dfb\u304d\u53d6\u308a\u307e\u3059\uff08\u7121\u6599\u76f8\u8ac760\u5206\uff09\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/koteihi-line\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=koteihi_shindan\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u516c\u5f0fLINE\u306e\u56fa\u5b9a\u8cbb\u524a\u6e1b\u8a3a\u65ad\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\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\/09\/cta_blog_koteihi_line.jpg\" alt=\"\u5fa1\u793e\u304c\u6e1b\u3089\u305b\u308b\u56fa\u5b9a\u8cbb\u306f\u6708\u3044\u304f\u3089\u304b\uff5c\u516c\u5f0fLINE\u3067\u8cea\u554f\u306b\u7b54\u3048\u308b\u3060\u3051\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\" 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;\">HASHSET TREESET<\/span>\n  <span class=\"section-title\" style=\"display:block;\">HashSet\u3068TreeSet\u306e\u4f7f\u3044\u65b9\u3068\u5b9f\u88c5\u4f8b<\/span>\n  <span class=\"section-desc\">Set\u306e2\u5927\u5b9f\u88c5\u2014\u2014\u691c\u7d22\u901f\u5ea6\u304b\u81ea\u52d5\u30bd\u30fc\u30c8\u304b<\/span>\n<\/h2>\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>HashSet\uff08\u30cf\u30c3\u30b7\u30e5\u30bb\u30c3\u30c8\uff09<\/strong>\uff1aSet\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u4ee3\u8868\u7684\u306a\u5b9f\u88c5\u3002\u8981\u7d20\u3092\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\uff08\u6563\u5217\u8868\uff09\u3067\u7ba1\u7406\u3059\u308b\u305f\u3081\u3001contains\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u691c\u7d22\u304c\u5e73\u5747O(1)\u3068\u3044\u3046\u9a5a\u7570\u7684\u306a\u901f\u5ea6\u3092\u8a87\u308b\u3002\u305f\u3060\u3057\u8981\u7d20\u306e\u9806\u5e8f\u306f\u4fdd\u8a3c\u3055\u308c\u306a\u3044\u3002\u91cd\u8907\u9664\u53bb\u3068\u9ad8\u901f\u691c\u7d22\u304c\u4e3b\u306a\u7528\u9014\u3002<\/p>\n<\/div>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">import java.util.*;\n\npublic class HashSetDemo {\n    public static void main(String[] args) {\n        Set&lt;String&gt; set = new HashSet&lt;&gt;();\n\n        \/\/ \u8ffd\u52a0\uff08\u91cd\u8907\u306f\u7121\u8996\u3055\u308c\u308b\uff09\n        set.add(\"apple\");\n        set.add(\"banana\");\n        set.add(\"cherry\");\n        set.add(\"apple\"); \/\/ \u7121\u8996\u3055\u308c\u308b\n\n        System.out.println(set);        \/\/ [banana, cherry, apple] \u2190 \u9806\u5e8f\u4e0d\u5b9a\n        System.out.println(set.size()); \/\/ 3\uff08\u91cd\u8907\u9664\u53bb\u30674\u21923\uff09\n\n        \/\/ \u9ad8\u901f\u306a\u5b58\u5728\u30c1\u30a7\u30c3\u30af\n        System.out.println(set.contains(\"banana\")); \/\/ true\n        System.out.println(set.contains(\"grape\"));  \/\/ false\n\n        \/\/ \u524a\u9664\n        set.remove(\"banana\");\n        System.out.println(set); \/\/ [cherry, apple]\n\n        \/\/ \u30eb\u30fc\u30d7\n        for (String s : set) {\n            System.out.println(s);\n        }\n    }\n}<\/code><\/pre>\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>TreeSet\uff08\u30c4\u30ea\u30fc\u30bb\u30c3\u30c8\uff09<\/strong>\uff1aSet\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u3067\u3001\u5185\u90e8\u7684\u306b\u8d64\u9ed2\u6728\uff08Red-Black Tree\uff09\u3092\u4f7f\u3063\u3066\u8981\u7d20\u3092\u81ea\u7136\u9806\uff08Comparable\u306b\u5f93\u3046\u9806\u5e8f\uff09\u3067\u30bd\u30fc\u30c8\u3057\u3066\u7ba1\u7406\u3059\u308b\u3002\u8981\u7d20\u306f\u5e38\u306b\u30bd\u30fc\u30c8\u6e08\u307f\u72b6\u614b\u3067\u683c\u7d0d\u3055\u308c\u308b\u3002\u691c\u7d22\u30fb\u8ffd\u52a0\u30fb\u524a\u9664\u306fO(log n)\u3002null\u306f\u8ffd\u52a0\u4e0d\u53ef\u3002<\/p>\n<\/div>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">import java.util.*;\n\npublic class TreeSetDemo {\n    public static void main(String[] args) {\n        \/\/ TreeSet: \u81ea\u52d5\u30bd\u30fc\u30c8\n        Set&lt;Integer&gt; numbers = new TreeSet&lt;&gt;();\n        numbers.add(5);\n        numbers.add(2);\n        numbers.add(8);\n        numbers.add(1);\n        numbers.add(2); \/\/ \u91cd\u8907\n\n        System.out.println(numbers); \/\/ [1, 2, 5, 8] \u2190 \u81ea\u52d5\u30bd\u30fc\u30c8\uff01\n\n        \/\/ \u7bc4\u56f2\u64cd\u4f5c\uff08TreeSet\u56fa\u6709\uff09\n        TreeSet&lt;Integer&gt; treeSet = new TreeSet&lt;&gt;(numbers);\n        System.out.println(treeSet.first());       \/\/ 1\uff08\u6700\u5c0f\u5024\uff09\n        System.out.println(treeSet.last());        \/\/ 8\uff08\u6700\u5927\u5024\uff09\n        System.out.println(treeSet.headSet(5));    \/\/ [1, 2]\uff085\u672a\u6e80\uff09\n        System.out.println(treeSet.tailSet(5));    \/\/ [5, 8]\uff085\u4ee5\u4e0a\uff09\n    }\n}<\/code><\/pre>\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;\">LinkedHashSet\u3092\u4f7f\u3046\u5834\u9762<\/strong>\n  <\/div>\n  <p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">\u91cd\u8907\u306f\u9664\u53bb\u3057\u305f\u3044\u304c\u3001\u633f\u5165\u9806\u306f\u4fdd\u6301\u3057\u305f\u3044\uff08HashSet\u306f\u9806\u5e8f\u4e0d\u5b9a\u3001TreeSet\u306f\u81ea\u7136\u9806\uff09\u3068\u3044\u3046\u30b1\u30fc\u30b9\u3067\u306f\u300cLinkedHashSet\u300d\u304c\u6700\u9069\u3067\u3059\u3002\u633f\u5165\u9806\u3092\u4fdd\u6301\u3057\u305f\u307e\u307e\u91cd\u8907\u9664\u53bb\u3067\u304d\u307e\u3059\u30023\u3064\u306eSet\u306e\u4e2d\u3067\u306f\u6700\u3082\u30d0\u30e9\u30f3\u30b9\u304c\u53d6\u308c\u305f\u5b9f\u88c5\u3067\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\/aibpo\/makase\/blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=aibpo_makase\" target=\"_blank\" rel=\"noopener\" aria-label=\"AIBPO\uff08\u670830\u4e07\u5186\u3067\u696d\u52d9\u307e\u304b\u305b\u653e\u984c\uff09\u306e\u7121\u6599\u76f8\u8ac7 \u4e88\u7d04\u30da\u30fc\u30b8\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\/09\/cta_blog_aibpo_makase.jpg\" alt=\"AI BPO by AI\u9b3c\u7ba1\u7406\uff5c\u670830\u4e07\u5186\u306e\u5b9a\u984d\u3067\u5fa1\u793e\u306e\u696d\u52d9\u3092\u307e\u308b\u3054\u3068\u5dfb\u304d\u53d6\u308a\u307e\u3059\uff08\u7121\u6599\u76f8\u8ac760\u5206\uff09\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/koteihi-line\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=koteihi_shindan\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u516c\u5f0fLINE\u306e\u56fa\u5b9a\u8cbb\u524a\u6e1b\u8a3a\u65ad\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\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\/09\/cta_blog_koteihi_line.jpg\" alt=\"\u5fa1\u793e\u304c\u6e1b\u3089\u305b\u308b\u56fa\u5b9a\u8cbb\u306f\u6708\u3044\u304f\u3089\u304b\uff5c\u516c\u5f0fLINE\u3067\u8cea\u554f\u306b\u7b54\u3048\u308b\u3060\u3051\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\" 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;\">CONVERSION<\/span>\n  <span class=\"section-title\" style=\"display:block;\">List\u3068Set\u306e\u76f8\u4e92\u5909\u63db\u2014\u20144\u3064\u306e\u65b9\u6cd5<\/span>\n  <span class=\"section-desc\">\u5b9f\u52d9\u3067\u3088\u304f\u4f7f\u3046\u5909\u63db\u30d1\u30bf\u30fc\u30f3\u3092\u5168\u7db2\u7f85<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">List\u3068Set\u306e\u76f8\u4e92\u5909\u63db\u306f\u5b9f\u52d9\u3067\u3088\u304f\u4f7f\u3046\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\u4e3b\u306a4\u3064\u306e\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5-1. List \u2192 Set \u5909\u63db\uff08\u91cd\u8907\u9664\u53bb\u306b\u4f7f\u3046\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">import java.util.*;\n\npublic class ListToSetConversion {\n    public static void main(String[] args) {\n        List&lt;String&gt; list = new ArrayList&lt;&gt;(\n            Arrays.asList(\"apple\", \"banana\", \"apple\", \"cherry\", \"banana\")\n        );\n        System.out.println(\"\u5143\u306eList: \" + list);\n        \/\/ [apple, banana, apple, cherry, banana]\n\n        \/\/ \u65b9\u6cd51: \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u6e21\u3059\uff08\u6700\u3082\u30b7\u30f3\u30d7\u30eb\uff09\n        Set&lt;String&gt; hashSet = new HashSet&lt;&gt;(list);\n        System.out.println(\"HashSet: \" + hashSet);\n        \/\/ [banana, cherry, apple] \u2190 \u91cd\u8907\u9664\u53bb\u30fb\u9806\u5e8f\u4e0d\u5b9a\n\n        \/\/ \u65b9\u6cd52: LinkedHashSet\uff08\u633f\u5165\u9806\u4fdd\u6301\uff09\n        Set&lt;String&gt; linkedSet = new LinkedHashSet&lt;&gt;(list);\n        System.out.println(\"LinkedHashSet: \" + linkedSet);\n        \/\/ [apple, banana, cherry] \u2190 \u91cd\u8907\u9664\u53bb\u30fb\u633f\u5165\u9806\u4fdd\u6301\n\n        \/\/ \u65b9\u6cd53: TreeSet\uff08\u81ea\u52d5\u30bd\u30fc\u30c8\uff09\n        Set&lt;String&gt; treeSet = new TreeSet&lt;&gt;(list);\n        System.out.println(\"TreeSet: \" + treeSet);\n        \/\/ [apple, banana, cherry] \u2190 \u91cd\u8907\u9664\u53bb\u30fb\u30bd\u30fc\u30c8\u6e08\u307f\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">5-2. Set \u2192 List \u5909\u63db<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">import java.util.*;\n\npublic class SetToListConversion {\n    public static void main(String[] args) {\n        Set&lt;String&gt; set = new HashSet&lt;&gt;(\n            Arrays.asList(\"apple\", \"banana\", \"cherry\")\n        );\n\n        \/\/ \u65b9\u6cd51: \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u6e21\u3059\uff08\u6700\u3082\u30b7\u30f3\u30d7\u30eb\uff09\n        List&lt;String&gt; list = new ArrayList&lt;&gt;(set);\n        System.out.println(\"ArrayList: \" + list);\n\n        \/\/ \u65b9\u6cd52: addAll()\u3092\u4f7f\u3046\n        List&lt;String&gt; list2 = new ArrayList&lt;&gt;();\n        list2.addAll(set);\n        System.out.println(\"addAll: \" + list2);\n\n        \/\/ \u5909\u63db\u5f8c\u306b\u30bd\u30fc\u30c8\u3057\u305f\u3044\u5834\u5408\n        Collections.sort(list);\n        System.out.println(\"\u30bd\u30fc\u30c8\u5f8c: \" + list); \/\/ [apple, banana, cherry]\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">5-3. Java 8\u4ee5\u964d\u306eStream API\u3092\u4f7f\u3063\u305f\u5909\u63db\uff08\u30e2\u30c0\u30f3\u306a\u66f8\u304d\u65b9\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">import java.util.*;\nimport java.util.stream.*;\n\npublic class StreamConversion {\n    public static void main(String[] args) {\n        \/\/ List \u2192 Set\uff08Stream API\uff09\n        List&lt;String&gt; list = Arrays.asList(\"apple\", \"banana\", \"apple\", \"cherry\");\n        Set&lt;String&gt; set = list.stream().collect(Collectors.toSet());\n        System.out.println(set); \/\/ [banana, cherry, apple]\n\n        \/\/ List \u2192 \u91cd\u8907\u9664\u53bb\u6e08\u307fList\uff08Set\u3092\u7d4c\u7531\u3057\u306a\u3044\u65b9\u6cd5\uff09\n        List&lt;String&gt; distinctList = list.stream()\n            .distinct()\n            .collect(Collectors.toList());\n        System.out.println(distinctList); \/\/ [apple, banana, cherry]\n\n        \/\/ Set \u2192 List\uff08Stream API\uff09\n        List&lt;String&gt; fromSet = set.stream().collect(Collectors.toList());\n        System.out.println(fromSet);\n    }\n}<\/code><\/pre>\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;\">\u5b9f\u52d9\u3067\u306e\u5909\u63db\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/strong>\n  <\/div>\n  <p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">Java 8\u4ee5\u964d\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001Stream API\u306e.collect(Collectors.toSet())\u3084.distinct()\u304c\u6700\u3082\u30e2\u30c0\u30f3\u3067\u8aad\u307f\u3084\u3059\u3044\u66f8\u304d\u65b9\u3067\u3059\u3002Java 7\u4ee5\u524d\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u300cnew HashSet<>(list)\u300d\u3084\u300cnew ArrayList<>(set)\u300d\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u6e21\u3057\u304c\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u3067\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\/aibpo\/makase\/blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=aibpo_makase\" target=\"_blank\" rel=\"noopener\" aria-label=\"AIBPO\uff08\u670830\u4e07\u5186\u3067\u696d\u52d9\u307e\u304b\u305b\u653e\u984c\uff09\u306e\u7121\u6599\u76f8\u8ac7 \u4e88\u7d04\u30da\u30fc\u30b8\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\/09\/cta_blog_aibpo_makase.jpg\" alt=\"AI BPO by AI\u9b3c\u7ba1\u7406\uff5c\u670830\u4e07\u5186\u306e\u5b9a\u984d\u3067\u5fa1\u793e\u306e\u696d\u52d9\u3092\u307e\u308b\u3054\u3068\u5dfb\u304d\u53d6\u308a\u307e\u3059\uff08\u7121\u6599\u76f8\u8ac760\u5206\uff09\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/koteihi-line\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=koteihi_shindan\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u516c\u5f0fLINE\u306e\u56fa\u5b9a\u8cbb\u524a\u6e1b\u8a3a\u65ad\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\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\/09\/cta_blog_koteihi_line.jpg\" alt=\"\u5fa1\u793e\u304c\u6e1b\u3089\u305b\u308b\u56fa\u5b9a\u8cbb\u306f\u6708\u3044\u304f\u3089\u304b\uff5c\u516c\u5f0fLINE\u3067\u8cea\u554f\u306b\u7b54\u3048\u308b\u3060\u3051\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\" 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;\">PERFORMANCE<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03\u2014\u2014\u8ffd\u52a0\u901f\u5ea6 vs \u691c\u7d22\u901f\u5ea6<\/span>\n  <span class=\"section-desc\">\u6570\u5024\u3067\u898b\u308bArrayList\u3068HashSet\u306e\u901f\u5ea6\u5dee<\/span>\n<\/h2>\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>\u8a08\u7b97\u91cf\uff08\u30d3\u30c3\u30b0\u30aa\u30fc\u8a18\u6cd5\uff09<\/strong>\uff1a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5b9f\u884c\u901f\u5ea6\u3092\u8981\u7d20\u6570N\u306b\u5bfe\u3057\u3066\u8868\u73fe\u3059\u308b\u8a18\u6cd5\u3002O(1)\u306f\u8981\u7d20\u6570\u306b\u4f9d\u5b58\u305b\u305a\u4e00\u5b9a\u901f\u5ea6\uff08\u30cf\u30c3\u30b7\u30e5\u63a2\u7d22\u306a\u3069\uff09\u3001O(n)\u306f\u8981\u7d20\u6570\u306b\u6bd4\u4f8b\u3057\u3066\u5897\u52a0\uff08\u7dda\u5f62\u63a2\u7d22\uff09\u3001O(log n)\u306f\u8981\u7d20\u6570\u306e\u5bfe\u6570\u306b\u6bd4\u4f8b\uff08\u4e8c\u5206\u63a2\u7d22\uff09\u3002\u5927\u91cf\u30c7\u30fc\u30bf\u3092\u6271\u3046\u3068\u304d\u306f\u8a08\u7b97\u91cf\u306e\u5dee\u304c\u51e6\u7406\u6642\u9593\u306b\u5927\u304d\u304f\u5f71\u97ff\u3059\u308b\u3002<\/p>\n<\/div>\n\n\n\n<table>\n<thead><tr><th>\u64cd\u4f5c<\/th><th>ArrayList<\/th><th>HashSet<\/th><th>TreeSet<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u8ffd\u52a0\uff08add\uff09<\/td><td>O(1)\u301cO(n)<\/td><td>O(1)\u5e73\u5747<\/td><td>O(log n)<\/td><\/tr>\n<tr><td>\u691c\u7d22\uff08contains\uff09<\/td><td>O(n)\u3010\u7dda\u5f62\u63a2\u7d22\u3011<\/td><td>O(1)\u5e73\u5747\u3010\u30cf\u30c3\u30b7\u30e5\u63a2\u7d22\u3011<\/td><td>O(log n)<\/td><\/tr>\n<tr><td>\u524a\u9664\uff08remove\uff09<\/td><td>O(n)<\/td><td>O(1)\u5e73\u5747<\/td><td>O(log n)<\/td><\/tr>\n<tr><td>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30a2\u30af\u30bb\u30b9\uff08get\uff09<\/td><td>O(1)<\/td><td>\u4e0d\u53ef\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306a\u3057\uff09<\/td><td>\u4e0d\u53ef<\/td><\/tr>\n<tr><td>\u30bd\u30fc\u30c8\u6e08\u307f\u53cd\u5fa9<\/td><td>O(n log n)\uff08\u5225\u9014sort\u8981\uff09<\/td><td>\u4e0d\u53ef\uff08\u9806\u5e8f\u306a\u3057\uff09<\/td><td>O(n)\uff08\u5e38\u306b\u30bd\u30fc\u30c8\u6e08\uff09<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<h3 class=\"wp-block-heading\">6-1. \u5b9f\u969b\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\uff08100\u4e07\u4ef6\u30c7\u30fc\u30bf\u3067\u306e\u4f8b\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6982\u5ff5\u7684\u306a\u8a08\u7b97\u91cf\u306e\u5dee\u304c\u5b9f\u969b\u3069\u308c\u304f\u3089\u3044\u306e\u901f\u5ea6\u5dee\u306b\u306a\u308b\u304b\u3001100\u4e07\u4ef6\u306e\u30c7\u30fc\u30bf\u3092\u4f7f\u3063\u305f\u4f8b\u3067\u78ba\u8a8d\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<table>\n<thead><tr><th>\u51e6\u7406<\/th><th>ArrayList<\/th><th>HashSet<\/th><th>\u901f\u5ea6\u5dee<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>100\u4e07\u4ef6\u8ffd\u52a0<\/td><td>\u7d0480ms<\/td><td>\u7d04110ms<\/td><td>ArrayList\u6709\u5229\uff08Set\u306fHash\u8a08\u7b97\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\uff09<\/td><\/tr>\n<tr><td>100\u4e07\u4ef6\u306e\u4e2d\u304b\u30891\u4ef6\u691c\u7d22\uff08contains\uff09<\/td><td>\u7d04200ms<\/td><td>\u7d040.1ms<\/td><td>HashSet\u7d042000\u500d\u9ad8\u901f\uff01<\/td><\/tr>\n<tr><td>\u91cd\u8907\u30c1\u30a7\u30c3\u30af\uff081\u4ef6\u305a\u3064\uff09<\/td><td>\u975e\u73fe\u5b9f\u7684\uff08n\u00d7n\uff09<\/td><td>\u5373\u5ea7<\/td><td>HashSet\u5727\u52dd<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">\u691c\u7d22\uff08contains\uff09\u64cd\u4f5c\u3067HashSet\u304cArrayList\u306e<strong>\u7d042000\u500d\u9ad8\u901f<\/strong>\u3068\u3044\u3046\u306e\u306f\u3001\u30d3\u30c3\u30b0\u30c7\u30fc\u30bf\u3092\u6271\u3046\u696d\u52d9\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u975e\u5e38\u306b\u91cd\u8981\u306a\u5dee\u3067\u3059\u3002\u300c\u9867\u5ba2ID\u306e\u4e00\u81f4\u691c\u7d22\u300d\u300c\u9664\u5916\u30ea\u30b9\u30c8\u3068\u306e\u6bd4\u8f03\u300d\u300c\u65e2\u5b58\u30c7\u30fc\u30bf\u3068\u306e\u91cd\u8907\u30c1\u30a7\u30c3\u30af\u300d\u306a\u3069\u3001\u691c\u7d22\u304c\u983b\u7e41\u306b\u767a\u751f\u3059\u308b\u5834\u9762\u3067\u306f\u7a4d\u6975\u7684\u306bSet\u3092\u4f7f\u3046\u3079\u304d\u3067\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\">Java\u306e\u696d\u52d9\u30b7\u30b9\u30c6\u30e0\u3067\u300c\u51e6\u7406\u304c\u9045\u3044\u300d\u3068\u3044\u3046\u554f\u984c\u306e\u4e00\u56e0\u3068\u3057\u3066\u3001\u300c\u5927\u91cf\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066ArrayList\u306econtains\u3092\u7e70\u308a\u8fd4\u3057\u4f7f\u3063\u3066\u3044\u308b\u300d\u30b1\u30fc\u30b9\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002HashSet\u306b\u5909\u63db\u3059\u308b\u3060\u3051\u3067\u5287\u7684\u306b\u9ad8\u901f\u5316\u3067\u304d\u308b\u3053\u3068\u304c\u3042\u308a\u307e\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\/aibpo\/makase\/blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=aibpo_makase\" target=\"_blank\" rel=\"noopener\" aria-label=\"AIBPO\uff08\u670830\u4e07\u5186\u3067\u696d\u52d9\u307e\u304b\u305b\u653e\u984c\uff09\u306e\u7121\u6599\u76f8\u8ac7 \u4e88\u7d04\u30da\u30fc\u30b8\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\/09\/cta_blog_aibpo_makase.jpg\" alt=\"AI BPO by AI\u9b3c\u7ba1\u7406\uff5c\u670830\u4e07\u5186\u306e\u5b9a\u984d\u3067\u5fa1\u793e\u306e\u696d\u52d9\u3092\u307e\u308b\u3054\u3068\u5dfb\u304d\u53d6\u308a\u307e\u3059\uff08\u7121\u6599\u76f8\u8ac760\u5206\uff09\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/koteihi-line\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-java-list-set&#038;blog_slug=cc-java-list-set&#038;blog_title=%E3%80%902026%E5%B9%B48%E6%9C%88%E6%9C%80%E6%96%B0%E3%80%91Java%E3%81%AEList%E3%81%A8Set%E3%81%AE%E9%81%95%E3%81%84%E3%82%92%E5%AE%8C%E5%85%A8%E8%A7%A3%E8%AA%AC%EF%BC%81%E5%A4%89%E6%8F%9B%E6%96%B9%E6%B3%95%E3%83%BB%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E6%AF%94%E8%BC%83%E3%83%BBClaude%20Code%E3%81%A7%E3%81%AE%E8%87%AA%E5%8B%95%E5%8C%96%E3%81%BE%E3%81%A7&#038;blog_url=https%3A%2F%2Fgenai-ai.co.jp%2Fai-kanri%2Fblog%2Fcc-java-list-set%2F&#038;utm_campaign=koteihi_shindan\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u516c\u5f0fLINE\u306e\u56fa\u5b9a\u8cbb\u524a\u6e1b\u8a3a\u65ad\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\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\/09\/cta_blog_koteihi_line.jpg\" alt=\"\u5fa1\u793e\u304c\u6e1b\u3089\u305b\u308b\u56fa\u5b9a\u8cbb\u306f\u6708\u3044\u304f\u3089\u304b\uff5c\u516c\u5f0fLINE\u3067\u8cea\u554f\u306b\u7b54\u3048\u308b\u3060\u3051\uff08\u7121\u6599\u30fb\u7d041\u5206\uff09\" 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;\">CLAUDE CODE<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u3010\u6bd4\u8f03\u3011Java\u3092\u624b\u66f8\u304d\u3059\u308b vs Claude Code\u3067\u751f\u6210\u3059\u308b<\/span>\n  <span class=\"section-desc\">\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c\u306eJava\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u5fc5\u8981\u306f\u306a\u3044\u6642\u4ee3\u306b\u306a\u3063\u305f<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u307e\u3067List\u3068Set\u306e\u4f7f\u3044\u65b9\u3092\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002\u5f8c\u534a\u3067\u306f<strong>\u300cJava\u30b3\u30fc\u30c9\u3092\u305d\u3082\u305d\u3082\u81ea\u5206\u3067\u66f8\u304f\u5fc5\u8981\u304c\u3042\u308b\u304b\uff1f\u300d<\/strong>\u3068\u3044\u3046\u8996\u70b9\u3092\u63d0\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<table>\n<thead><tr><th>\u6bd4\u8f03\u8ef8<\/th><th>Java\u3092\u81ea\u5206\u3067\u66f8\u304f<\/th><th>Claude Code\u3067\u751f\u6210\u3059\u308b<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u5b66\u7fd2\u30b3\u30b9\u30c8<\/td><td>\u9ad8\u3044\uff08Java\u6587\u6cd5\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3API\u7fd2\u5f97\u304c\u5fc5\u8981\uff09<\/td><td>\u4f4e\u3044\uff08\u65e5\u672c\u8a9e\u3067\u300c\u3053\u3046\u3044\u3046\u51e6\u7406\u304c\u3057\u305f\u3044\u300d\u3068\u8a00\u3046\u3060\u3051\uff09<\/td><\/tr>\n<tr><td>\u5b9f\u88c5\u901f\u5ea6<\/td><td>\u9045\u3044\uff08\u66f8\u304f\u2192\u30c6\u30b9\u30c8\u2192\u30d0\u30b0\u4fee\u6b63\u2192\u30c6\u30b9\u30c8\uff09<\/td><td>\u901f\u3044\uff08\u751f\u6210\u3055\u308c\u305f\u30b3\u30fc\u30c9\u3092\u78ba\u8a8d\u30fb\u4fee\u6b63\u3059\u308b\u3060\u3051\uff09<\/td><\/tr>\n<tr><td>\u54c1\u8cea<\/td><td>\u719f\u7df4\u5ea6\u306b\u5927\u304d\u304f\u4f9d\u5b58<\/td><td>\u73fe\u4ee3\u7684\u306a\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u8e0f\u307e\u3048\u305f\u30b3\u30fc\u30c9\u304c\u51fa\u308b<\/td><\/tr>\n<tr><td>\u30a8\u30e9\u30fc\u5bfe\u5fdc<\/td><td>\u81ea\u529b\u3067\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u8aad\u3093\u3067\u89e3\u6c7a<\/td><td>\u30a8\u30e9\u30fc\u3092\u305d\u306e\u307e\u307e\u8cbc\u3063\u3066\u300c\u76f4\u3057\u3066\u300d\u3067\u89e3\u6c7a<\/td><\/tr>\n<tr><td>\u5411\u3044\u3066\u3044\u308b\u4eba<\/td><td>Java\u3092\u8077\u696d\u3068\u3057\u3066\u4f7f\u3046\u30a8\u30f3\u30b8\u30cb\u30a2<\/td><td>Java\u304c\u5fc5\u8981\u306a\u696d\u52d9\u304c\u3042\u308b\u304c\u672c\u8077\u306f\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u306a\u3044\u4eba<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<h3 class=\"wp-block-heading\">7-1. Claude Code\u3078\u306eJava\u30b3\u30fc\u30c9\u4f9d\u983c\u306e\u5b9f\u8df5\u4f8b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u969b\u306bClaude Code\u306b\u4f9d\u983c\u3059\u308b\u3068\u304d\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u4f8b\uff1a<\/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>\u300cJava\u3067CSV\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u307f\u3001\u5546\u54c1\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u3092\u9664\u53bb\u3057\u3066\u30ea\u30b9\u30c8\u5316\u3059\u308b\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3002ArrayList\u3068HashSet\u3092\u4f7f\u3063\u3066\u300d<\/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>\u300cJava 8\u306eStream API\u3092\u4f7f\u3063\u3066\u3001List&lt;String&gt;\u304b\u3089\u91cd\u8907\u3092\u9664\u53bb\u3057\u3066\u30bd\u30fc\u30c8\u6e08\u307fList\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3092\u66f8\u3044\u3066\u300d<\/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>\u300c\u3053\u306e\u30b3\u30fc\u30c9\u3067HashSet\u306b\u5165\u308c\u3066\u3044\u308b\u306e\u306bcontains\u304c\u9045\u3044\u306e\u306f\u306a\u305c\uff1fequals\u3068hashCode\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u3089\u3068\u3044\u3046\u4eee\u8aac\u3092\u78ba\u8a8d\u3057\u3066\u300d<\/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>\u300cList\u3092Set\u306b\u5909\u63db\u3057\u3066\u91cd\u8907\u9664\u53bb\u3059\u308b\u51e6\u7406\u3092JUnit5\u3067\u30c6\u30b9\u30c8\u3059\u308b\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u300d<\/span><\/div>\n<\/div>\n\n\n\n<div class=\"g-flow-row\" style=\"margin:24px 0;\">\n  <div class=\"g-flow-item\">\u300c\u3053\u3046\u3044\u3046\u51e6\u7406\u304c<br>\u5fc5\u8981\u300d\u3092\u65e5\u672c\u8a9e\u3067\u8aac\u660e<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">Claude Code\u304cJava<br>\u30b3\u30fc\u30c9\u3092\u751f\u6210<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u30b3\u30fc\u30c9\u3092\u30b3\u30d4\u30fc&\u30da\u30fc\u30b9\u30c8\u3057\u3066<br>\u5b9f\u884c\u30fb\u78ba\u8a8d<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u3046\u307e\u304f\u52d5\u304b\u306a\u3044\u5834\u5408\u306f<br>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u6e21\u3059<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u4fee\u6b63\u30b3\u30fc\u30c9\u304c<br>\u8fd4\u3063\u3066\u304f\u308b<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">7-2. Claude Code\u306eJava\u751f\u6210\u54c1\u8cea<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Claude Code\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8cea\u306e\u9ad8\u3044Java\u30b3\u30fc\u30c9\u3092\u751f\u6210\u3057\u307e\u3059\uff1a<\/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>\u578b\u5b89\u5168\u306aGenerics<\/strong>\uff1aList&lt;String&gt;\u306e\u3088\u3046\u306a\u578b\u5f15\u6570\u3092\u6b63\u3057\u304f\u4f7f\u3046<\/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>\u30e2\u30c0\u30f3\u306a\u66f8\u304d\u65b9<\/strong>\uff1aJava 8\u4ee5\u964d\u306eStream API\u30fb\u30e9\u30e0\u30c0\u5f0f\u30fbOptional\u5bfe\u5fdc<\/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\u5b89\u5168<\/strong>\uff1aNullPointerException\u304c\u8d77\u304d\u306b\u304f\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f<\/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>\u30b3\u30e1\u30f3\u30c8\u4ed8\u304d<\/strong>\uff1a\u300c\u65e5\u672c\u8a9e\u306e\u30b3\u30e1\u30f3\u30c8\u3092\u5165\u308c\u3066\u300d\u3068\u4f9d\u983c\u3059\u308c\u3070\u65e5\u672c\u8a9e\u30b3\u30e1\u30f3\u30c8\u4ed8\u304d\u3067\u51fa\u3066\u304f\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>\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u540c\u6642\u751f\u6210<\/strong>\uff1a\u300cJUnit\u306e\u30c6\u30b9\u30c8\u3082\u4e00\u7dd2\u306b\u66f8\u3044\u3066\u300d\u3068\u8a00\u3048\u3070\u5bfe\u5fdc\u53ef\u80fd<\/span><\/div>\n<\/div>\n\n\n\n<div style=\"background:linear-gradient(135deg,#1a1a1a,#2a1015);border-radius:12px;padding:20px 24px;margin:24px 0;display:flex;align-items:center;gap:16px;color:#fff;\">\n  <span style=\"font-size:36px;\">&#127942;<\/span>\n  <div>\n    <div style=\"font-size:13px;color:#dc2626;font-weight:700;letter-spacing:1px;\">VERDICT<\/div>\n    <div style=\"font-size:18px;font-weight:800;\">Claude Code \u306b\u8ecd\u914d<\/div>\n    <div style=\"font-size:14px;color:rgba(255,255,255,0.7);margin-top:4px;\">Java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c\u306f\u5b9a\u578b\u30b3\u30fc\u30c9\u304c\u591a\u304f\u3001Claude Code\u304c\u6700\u3082\u5f97\u610f\u3068\u3059\u308b\u5206\u91ce\u3002\u300c\u81ea\u5206\u3067\u66f8\u304f\u300d\u3088\u308a\u300cClaude Code\u306b\u66f8\u3044\u3066\u3082\u3089\u3063\u3066\u78ba\u8a8d\u30fb\u4fee\u6b63\u3059\u308b\u300d\u65b9\u304c\u54c1\u8cea\u3082\u901f\u5ea6\u3082\u4e0a\u3002<\/div>\n  <\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f0a\u793eGENAI\u306e\u30a8\u30f3\u30b8\u30cb\u30a2\u3082\u3001Java\u3067\u696d\u52d9\u30ed\u30b8\u30c3\u30af\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306bClaude Code\u3092\u7a4d\u6975\u6d3b\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u7279\u306b\u300cData\u30d9\u30fc\u30b9\u306e\u30c7\u30fc\u30bf\u3092Collection\u3067\u6574\u5f62\u3059\u308b\u51e6\u7406\u300d\u300c\u91cd\u8907\u9664\u53bb\u30fb\u30b0\u30eb\u30fc\u30d7\u5316\u30fb\u30bd\u30fc\u30c8\u51e6\u7406\u300d\u306f\u3001Claude Code\u3078\u306e\u4e00\u8a00\u6307\u793a\u3067\u5b8c\u6210\u3059\u308b\u30b1\u30fc\u30b9\u304c\u591a\u304f\u3001\u5b9f\u88c5\u5de5\u6570\u304c\u5f93\u6765\u306e1\/4\u301c1\/5\u7a0b\u5ea6\u306b\u77ed\u7e2e\u3055\u308c\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\">AI\u304c\u666e\u53ca\u3057\u305f\u4eca\u3067\u3082\u3001\u300cList\u3068Set\u306e\u9055\u3044\u3092\u77e5\u308b\u300d\u3068\u3044\u3046\u77e5\u8b58\u81ea\u4f53\u306f\u91cd\u8981\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001Claude Code\u304c\u51fa\u3057\u305f\u30b3\u30fc\u30c9\u3092\u300c\u3053\u308c\u3067\u672c\u5f53\u306b\u826f\u3044\u304b\u300d\u3068\u5224\u65ad\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u3060\u304b\u3089\u3067\u3059\u3002\u77e5\u8b58\u304c\u306a\u3051\u308c\u3070AI\u306e\u51fa\u529b\u3092\u78ba\u8a8d\u3067\u304d\u306a\u3044\u3002\u300c\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u300d\u3068\u300c\u30b3\u30fc\u30c9\u3092\u8aad\u3093\u3067\u5224\u65ad\u3059\u308b\u300d\u306f\u5225\u306e\u30b9\u30ad\u30eb\u3067\u3059\u3002<\/div>\n<\/div>\n\n\ncc-java-list-set\n<div style=\"background:#fff;border:2px solid #eee;border-radius:16px;padding:32px 20px;margin:48px 0 16px;\">\n  <p style=\"text-align:center;font-size:13px;font-weight:700;color:#dc2626;letter-spacing:2px;margin:0 0 12px;\">NEXT STEP<\/p>\n  <p style=\"text-align:center;font-size:22px;font-weight:800;line-height:1.5;color:#1a1a1a;margin:0 0 24px;\">\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=\"display:flex;gap:16px;flex-wrap:wrap;justify-content:center;\">\n    <div style=\"flex:1 1 300px;max-width:560px;background:#fafafa;border:1px solid #eee;border-radius:12px;overflow:hidden;display:flex;flex-direction:column;\">\n      <img src=\"https:\/\/genai-ai.co.jp\/img\/flagship-onikanri.png\" alt=\"AI\u9b3c\u7ba1\u7406 \u2014 Claude Code\u5c0e\u5165\u652f\u63f4\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\" loading=\"lazy\" decoding=\"async\" style=\"width:100%;height:auto;aspect-ratio:16\/9;object-fit:cover;display:block;\">\n      <div style=\"padding:20px 20px 24px;display:flex;flex-direction:column;flex:1;\">\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;color:#1a1a1a;margin:0 0 12px;\">AI\u9b3c\u7ba1\u7406<\/p>\n        <p style=\"font-size:14px;color:#555;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;margin-top:auto;\">\n          <a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&utm_medium=article&utm_campaign=cc-java-list-set&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    <div style=\"flex:1 1 300px;max-width:560px;background:#fafafa;border:1px solid #eee;border-radius:12px;overflow:hidden;display:flex;flex-direction:column;\">\n      <img src=\"https:\/\/genai-ai.co.jp\/img\/flagship-aibpo.png\" alt=\"AIBPO by AI\u9b3c\u7ba1\u7406 \u2014 \u5b9a\u578b\u696d\u52d9\u306e\u4e38\u3054\u3068\u4ee3\u884c\" loading=\"lazy\" decoding=\"async\" style=\"width:100%;height:auto;aspect-ratio:16\/9;object-fit:cover;display:block;\">\n      <div style=\"padding:20px 20px 24px;display:flex;flex-direction:column;flex:1;\">\n        <p style=\"font-size:13px;color:#dc2626;font-weight:700;margin:0 0 8px;\">\u696d\u52d9\u3092\u4e38\u3054\u3068\u4efb\u305b\u305f\u3044\u65b9\u3078<\/p>\n        <p style=\"font-size:20px;font-weight:800;color:#1a1a1a;margin:0 0 12px;\">AIBPO by AI\u9b3c\u7ba1\u7406<\/p>\n        <p style=\"font-size:14px;color:#555;margin:0 0 20px;line-height:1.7;\">\u8acb\u6c42\u51e6\u7406\u30fb\u30c7\u30fc\u30bf\u5165\u529b\u30fb\u554f\u3044\u5408\u308f\u305b\u5bfe\u5fdc\u306a\u3069\u306e\u5b9a\u578b\u696d\u52d9\u3092\u3001AI\u00d7\u4eba\u306e\u54c1\u8cea\u7ba1\u7406\u4f53\u5236\u3067\u4e38\u3054\u3068\u4ee3\u884c\u3002\u670830\u4e07\u5186\u306e\u5b9a\u984d\u3067\u307e\u304b\u305b\u653e\u984c\u3001\u65e5\u3005\u306f\u6210\u679c\u7269\u3092\u627f\u8a8d\u3059\u308b\u3060\u3051\u3002<\/p>\n        <div style=\"text-align:center;margin-top:auto;\">\n          <a href=\"https:\/\/genai-ai.co.jp\/ai-kanri\/ai-bpo\/?utm_source=blog&utm_medium=article&utm_campaign=cc-java-list-set&utm_content=next-step-cta-bpo\" 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;\">AIBPO\u3092\u8a73\u3057\u304f\u898b\u308b \u2192<\/a>\n        <\/div>\n      <\/div>\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\u306eList\u3068Set\u3069\u3061\u3089\u3092\u4f7f\u3048\u3070\u3044\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u300c\u91cd\u8907\u30c7\u30fc\u30bf\u304c\u3042\u308b\u304b\u300d\u300c\u9806\u5e8f\u304c\u91cd\u8981\u304b\u300d\u3067\u5224\u65ad\u3057\u307e\u3059\u3002\u91cd\u8907\u306a\u3057\u306e\u30c7\u30fc\u30bf\u3067\u691c\u7d22\u901f\u5ea6\u304c\u91cd\u8981\u2192HashSet\u3002\u9806\u5e8f\u4ed8\u304d\u306e\u30c7\u30fc\u30bf\u30fb\u91cd\u8907\u3042\u308a\u2192ArrayList\u3002\u9806\u5e8f\u306a\u3057\u3067\u3044\u3044\u304c\u91cd\u8907\u9664\u53bb\u3057\u305f\u3044\u2192HashSet\uff08\u307e\u305f\u306fLinkedHashSet\uff09\u3002\u81ea\u7136\u9806\u3067\u30bd\u30fc\u30c8\u3057\u305f\u3044\u2192TreeSet\u3002\u8ff7\u3063\u305f\u3089\u300c\u7279\u5225\u306a\u7406\u7531\u304c\u306a\u3044\u9650\u308aArrayList\u304b\u3089\u59cb\u3081\u3001\u691c\u7d22\u304c\u983b\u7e41\u306b\u306a\u3063\u305f\u3089HashSet\u306b\u5207\u308a\u66ff\u3048\u308b\u300d\u3068\u3044\u3046\u5224\u65ad\u3067OK\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. Java\u3067List\u3092Set\u306b\u5909\u63db\u3059\u308b\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u65b9\u6cd5\u306f\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. new HashSet<>(list) \u304c\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306bList\u3092\u6e21\u3059\u3060\u3051\u3067\u81ea\u52d5\u7684\u306bSet\u306b\u5909\u63db\u3055\u308c\u3001\u91cd\u8907\u3082\u9664\u53bb\u3055\u308c\u307e\u3059\u3002\u633f\u5165\u9806\u3092\u4fdd\u6301\u3057\u305f\u3044\u5834\u5408\u306fnew LinkedHashSet<>(list)\u3001\u30bd\u30fc\u30c8\u3057\u305f\u3044\u5834\u5408\u306fnew TreeSet<>(list)\u3092\u4f7f\u3044\u307e\u3059\u3002Java 8\u4ee5\u964d\u306a\u3089list.stream().collect(Collectors.toSet())\u3068\u3044\u3046Stream API\u306e\u66f8\u304d\u65b9\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. HashSet\u306f\u306a\u305cArrayList\u3088\u308a\u691c\u7d22\u304c\u901f\u3044\u306e\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. ArrayList\u306econtains\u306f\u5148\u982d\u304b\u30891\u4ef6\u305a\u3064\u9806\u756a\u306b\u63a2\u3059\u300c\u7dda\u5f62\u63a2\u7d22\u300d\uff08O(n)\uff09\u3067\u3059\u3002100\u4e07\u4ef6\u3042\u308c\u3070\u6700\u60aa100\u4e07\u56de\u6bd4\u8f03\u3057\u307e\u3059\u3002HashSet\u306f\u30cf\u30c3\u30b7\u30e5\u5024\uff08\u8981\u7d20\u304b\u3089\u8a08\u7b97\u3057\u305f\u6570\u5024\uff09\u3092\u4f7f\u3063\u3066\u76f4\u63a5\u76ee\u7684\u306e\u5834\u6240\u3092\u53c2\u7167\u3059\u308b\u305f\u3081\u3001\u30c7\u30fc\u30bf\u4ef6\u6570\u306b\u95a2\u4fc2\u306a\u304f\u307b\u307c\u4e00\u5b9a\u901f\u5ea6\uff08O(1)\uff09\u3067\u691c\u7d22\u3067\u304d\u307e\u3059\u3002\u5927\u91cf\u30c7\u30fc\u30bf\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u3067\u306fHashSet\u3092\u4f7f\u3046\u3068\u5287\u7684\u306b\u901f\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. TreeSet\u3068HashSet\u306e\u4f7f\u3044\u5206\u3051\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u300c\u5e38\u306b\u30bd\u30fc\u30c8\u6e08\u307f\u3067\u7ba1\u7406\u3057\u305f\u3044\u300d\u2192TreeSet\u3002\u300c\u9806\u5e8f\u306f\u4e0d\u8981\u3067\u691c\u7d22\u901f\u5ea6\u3092\u6700\u5927\u5316\u3057\u305f\u3044\u300d\u2192HashSet\u3002\u5177\u4f53\u4f8b\uff1a\u90f5\u4fbf\u756a\u53f7\u4e00\u89a7\u3092\u6607\u9806\u3067\u7ba1\u7406\u2192TreeSet\u3002\u5546\u54c1\u30b3\u30fc\u30c9\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\uff08\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\uff09\u2192HashSet\u3002\u306a\u304a\u3001TreeSet\u306econtains\u306fHashSet\u3088\u308a\u9045\u3044\uff08O(log n) vs O(1)\uff09\u3067\u3059\u304c\u3001ArrayList\u3088\u308a\u306f\u9065\u304b\u306b\u901f\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. Claude Code\u306fJava\u306e\u30b3\u30fc\u30c9\u3082\u66f8\u3044\u3066\u304f\u308c\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u306f\u3044\u3001Java\uff08Java 8\u4ee5\u964d\u3001Spring Boot\u3001Maven\/Gradle\u5bfe\u5fdc\uff09\u306e\u30b3\u30fc\u30c9\u751f\u6210\u304c\u53ef\u80fd\u3067\u3059\u3002\u300cJava\u3067List\u3068Set\u3092\u4f7f\u3063\u305f\u91cd\u8907\u9664\u53bb\u51e6\u7406\u3092\u66f8\u3044\u3066\u300d\u3068\u3044\u3046\u65e5\u672c\u8a9e\u306e\u6307\u793a\u3060\u3051\u3067\u3001\u5b9f\u969b\u306b\u52d5\u304f\u30b3\u30fc\u30c9\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002\u30a8\u30e9\u30fc\u304c\u51fa\u305f\u5834\u5408\u3082\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u305d\u306e\u307e\u307e\u6e21\u3059\u3068\u4fee\u6b63\u30b3\u30fc\u30c9\u304c\u51fa\u3066\u304d\u307e\u3059\u3002Java\u56fa\u6709\u306eStream API\u30fbGenerics\u30fb\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c\u306f\u7279\u306b\u5f97\u610f\u306a\u9818\u57df\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. Java\u306eSet\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. HashSet\u30fbTreeSet\u30fbLinkedHashSet\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u306f\u3042\u308a\u307e\u305b\u3093\uff08\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306e\u540c\u6642\u30a2\u30af\u30bb\u30b9\u3067\u554f\u984c\u304c\u8d77\u304d\u308b\u53ef\u80fd\u6027\uff09\u3002\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306f\u300cCollections.synchronizedSet(new HashSet<>())\u300d\u3067\u30e9\u30c3\u30d7\u3059\u308b\u304b\u3001\u300cConcurrentHashMap.newKeySet()\u300d\uff08Java 8\u4ee5\u964d\uff09\u3092\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\u3002List\u3082\u540c\u69d8\u3067\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u306b\u306fCopyOnWriteArrayList\u3092\u4f7f\u3044\u307e\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\u306eList\u3068Set\u3069\u3061\u3089\u3092\u4f7f\u3048\u3070\u3044\u3044\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u300c\u91cd\u8907\u30c7\u30fc\u30bf\u304c\u3042\u308b\u304b\u300d\u300c\u9806\u5e8f\u304c\u91cd\u8981\u304b\u300d\u3067\u5224\u65ad\u3057\u307e\u3059\u3002\u91cd\u8907\u306a\u3057\u306e\u30c7\u30fc\u30bf\u3067\u691c\u7d22\u901f\u5ea6\u304c\u91cd\u8981\u2192HashSet\u3002\u9806\u5e8f\u4ed8\u304d\u306e\u30c7\u30fc\u30bf\u30fb\u91cd\u8907\u3042\u308a\u2192ArrayList\u3002\u9806\u5e8f\u306a\u3057\u3067\u3044\u3044\u304c\u91cd\u8907\u9664\u53bb\u3057\u305f\u3044\u2192HashSet\uff08\u307e\u305f\u306fLinkedHashSet\uff09\u3002\u81ea\u7136\u9806\u3067\u30bd\u30fc\u30c8\u3057\u305f\u3044\u2192TreeSet\u3002\u8ff7\u3063\u305f\u3089\u300c\u7279\u5225\u306a\u7406\u7531\u304c\u306a\u3044\u9650\u308aArrayList\u304b\u3089\u59cb\u3081\u3001\u691c\u7d22\u304c\u983b\u7e41\u306b\u306a\u3063\u305f\u3089HashSet\u306b\u5207\u308a\u66ff\u3048\u308b\u300d\u3068\u3044\u3046\u5224\u65ad\u3067OK\u3067\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Java\u3067List\u3092Set\u306b\u5909\u63db\u3059\u308b\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u65b9\u6cd5\u306f\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"new HashSet<>(list) \u304c\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306bList\u3092\u6e21\u3059\u3060\u3051\u3067\u81ea\u52d5\u7684\u306bSet\u306b\u5909\u63db\u3055\u308c\u3001\u91cd\u8907\u3082\u9664\u53bb\u3055\u308c\u307e\u3059\u3002\u633f\u5165\u9806\u3092\u4fdd\u6301\u3057\u305f\u3044\u5834\u5408\u306fnew LinkedHashSet<>(list)\u3001\u30bd\u30fc\u30c8\u3057\u305f\u3044\u5834\u5408\u306fnew TreeSet<>(list)\u3092\u4f7f\u3044\u307e\u3059\u3002Java 8\u4ee5\u964d\u306a\u3089list.stream().collect(Collectors.toSet())\u3068\u3044\u3046Stream API\u306e\u66f8\u304d\u65b9\u3082\u3067\u304d\u307e\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"HashSet\u306f\u306a\u305cArrayList\u3088\u308a\u691c\u7d22\u304c\u901f\u3044\u306e\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"ArrayList\u306econtains\u306f\u5148\u982d\u304b\u30891\u4ef6\u305a\u3064\u9806\u756a\u306b\u63a2\u3059\u300c\u7dda\u5f62\u63a2\u7d22\u300d\uff08O(n)\uff09\u3067\u3059\u3002100\u4e07\u4ef6\u3042\u308c\u3070\u6700\u60aa100\u4e07\u56de\u6bd4\u8f03\u3057\u307e\u3059\u3002HashSet\u306f\u30cf\u30c3\u30b7\u30e5\u5024\uff08\u8981\u7d20\u304b\u3089\u8a08\u7b97\u3057\u305f\u6570\u5024\uff09\u3092\u4f7f\u3063\u3066\u76f4\u63a5\u76ee\u7684\u306e\u5834\u6240\u3092\u53c2\u7167\u3059\u308b\u305f\u3081\u3001\u30c7\u30fc\u30bf\u4ef6\u6570\u306b\u95a2\u4fc2\u306a\u304f\u307b\u307c\u4e00\u5b9a\u901f\u5ea6\uff08O(1)\uff09\u3067\u691c\u7d22\u3067\u304d\u307e\u3059\u3002\u5927\u91cf\u30c7\u30fc\u30bf\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u3067\u306fHashSet\u3092\u4f7f\u3046\u3068\u5287\u7684\u306b\u901f\u304f\u306a\u308a\u307e\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"TreeSet\u3068HashSet\u306e\u4f7f\u3044\u5206\u3051\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u300c\u5e38\u306b\u30bd\u30fc\u30c8\u6e08\u307f\u3067\u7ba1\u7406\u3057\u305f\u3044\u300d\u2192TreeSet\u3002\u300c\u9806\u5e8f\u306f\u4e0d\u8981\u3067\u691c\u7d22\u901f\u5ea6\u3092\u6700\u5927\u5316\u3057\u305f\u3044\u300d\u2192HashSet\u3002\u5177\u4f53\u4f8b\uff1a\u90f5\u4fbf\u756a\u53f7\u4e00\u89a7\u3092\u6607\u9806\u3067\u7ba1\u7406\u2192TreeSet\u3002\u5546\u54c1\u30b3\u30fc\u30c9\u306e\u5b58\u5728\u30c1\u30a7\u30c3\u30af\uff08\u30d6\u30e9\u30c3\u30af\u30ea\u30b9\u30c8\uff09\u2192HashSet\u3002\u306a\u304a\u3001TreeSet\u306econtains\u306fHashSet\u3088\u308a\u9045\u3044\uff08O(log n) vs O(1)\uff09\u3067\u3059\u304c\u3001ArrayList\u3088\u308a\u306f\u9065\u304b\u306b\u901f\u3044\u3067\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Claude Code\u306fJava\u306e\u30b3\u30fc\u30c9\u3082\u66f8\u3044\u3066\u304f\u308c\u307e\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u306f\u3044\u3001Java\uff08Java 8\u4ee5\u964d\u3001Spring Boot\u3001Maven\/Gradle\u5bfe\u5fdc\uff09\u306e\u30b3\u30fc\u30c9\u751f\u6210\u304c\u53ef\u80fd\u3067\u3059\u3002\u300cJava\u3067List\u3068Set\u3092\u4f7f\u3063\u305f\u91cd\u8907\u9664\u53bb\u51e6\u7406\u3092\u66f8\u3044\u3066\u300d\u3068\u3044\u3046\u65e5\u672c\u8a9e\u306e\u6307\u793a\u3060\u3051\u3067\u3001\u5b9f\u969b\u306b\u52d5\u304f\u30b3\u30fc\u30c9\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002\u30a8\u30e9\u30fc\u304c\u51fa\u305f\u5834\u5408\u3082\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u305d\u306e\u307e\u307e\u6e21\u3059\u3068\u4fee\u6b63\u30b3\u30fc\u30c9\u304c\u51fa\u3066\u304d\u307e\u3059\u3002Java\u56fa\u6709\u306eStream API\u30fbGenerics\u30fb\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c\u306f\u7279\u306b\u5f97\u610f\u306a\u9818\u57df\u3067\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Java\u306eSet\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"HashSet\u30fbTreeSet\u30fbLinkedHashSet\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u306f\u3042\u308a\u307e\u305b\u3093\uff08\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306e\u540c\u6642\u30a2\u30af\u30bb\u30b9\u3067\u554f\u984c\u304c\u8d77\u304d\u308b\u53ef\u80fd\u6027\uff09\u3002\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306f\u300cCollections.synchronizedSet(new HashSet<>())\u300d\u3067\u30e9\u30c3\u30d7\u3059\u308b\u304b\u3001\u300cConcurrentHashMap.newKeySet()\u300d\uff08Java 8\u4ee5\u964d\uff09\u3092\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\u3002List\u3082\u540c\u69d8\u3067\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u306b\u306fCopyOnWriteArrayList\u3092\u4f7f\u3044\u307e\u3059\u3002\"\n      }\n    }\n  ]\n}\n<\/script>\n\n\n\n<!-- RELATED_ARTICLES_START --><div class=\"related-articles related-v2\"><h3>\u95a2\u9023\u8a18\u4e8b \u2014 \u55b6\u696d\u30fb\u696d\u52d9\u52b9\u7387\u5316\u30ab\u30c6\u30b4\u30ea\u304b\u3089<\/h3><div class=\"rel-grid\"><a href=\"https:\/\/genai-ai.co.jp\/ai-kanri\/blog\/hub-gyomu\/\" class=\"rel-card rel-pillar\"><span class=\"rel-cat\">\u67f1\u8a18\u4e8b<\/span><span class=\"rel-title\">\u696d\u52d9\u52b9\u7387\u5316\u30fb\u66f8\u985e\u4f5c\u6210 \u5b8c\u5168\u30ac\u30a4\u30c9\uff5c\u6587\u66f8\u7ba1\u7406\u30fb\u5831\u544a\u66f8\u30fb\u65e5\u5831\u306e\u5b9f\u52d9\u304b\u3089Claude Code\uff0fCodex\u306b\u3088\u308b\u81ea\u52d5\u5316\u307e\u3067\u30102026\u5e748\u6708\u6700\u65b0\u3011<\/span><\/a><a 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Code\u3067Java\u30b3\u30fc\u30c9\u3092\u81ea\u52d5\u751f\u6210\u3059\u308b\u65b9\u6cd5\u307e\u3067\u7db2\u7f85\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":15537,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"sitemap_hide":"","_veu_custom_css":"","vkexunit_cta_each_option":"","_lightning_design_setting":[],"footnotes":"","rank_math_description":"Java\u306eList\u3068Set\u306e\u9055\u3044\u30fb\u5909\u63db\u65b9\u6cd5\u3092\u5b8c\u5168\u89e3\u8aac\u3002ArrayList\u3068HashSet\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03\uff08\u8ffd\u52a0\u901f\u5ea6\u30fb\u691c\u7d22\u901f\u5ea6\uff09\u3001\u76f8\u4e92\u5909\u63db\u306e\u5b9f\u88c5\u65b9\u6cd5\u3001\u305d\u3057\u3066Claude Code\u3067Java\u30b3\u30fc\u30c9\u3092\u81ea\u52d5\u751f\u6210\u3059\u308b\u65b9\u6cd5\u307e\u3067\u7db2\u7f85\u3057\u3066\u3044\u307e\u3059\u3002","rank_math_focus_keyword":"Java List Set 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