{"id":6535,"date":"2024-03-14T18:10:09","date_gmt":"2024-03-14T09:10:09","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8blist%e3%81%aegroupby%e3%81%ae%e5%bd%b9%e5%89%b2%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/"},"modified":"2025-08-03T09:37:31","modified_gmt":"2025-08-03T00:37:31","slug":"java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8blist%e3%81%aegroupby%e3%81%ae%e5%bd%b9%e5%89%b2%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8blist%e3%81%aegroupby%e3%81%ae%e5%bd%b9%e5%89%b2%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/","title":{"rendered":"Java List\u306egroupBy\u3068\u306f\uff1f\u4f7f\u3044\u65b9\u3068\u5b9f\u88c5\u4f8b\u3092\u89e3\u8aac"},"content":{"rendered":"<p>Java\u306b\u304a\u3044\u3066\u3001List\u306egroupBy\u30e1\u30bd\u30c3\u30c9\u306f\u901a\u5e38\u3001Stream 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class=\"post-pre\"><code>List&lt;Student&gt; students = Arrays.asList(\r\n    <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Student<\/span>(<span class=\"hljs-string\">\"Alice\"<\/span>, <span class=\"hljs-number\">20<\/span>),\r\n    <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Student<\/span>(<span class=\"hljs-string\">\"Bob\"<\/span>, <span class=\"hljs-number\">22<\/span>),\r\n    <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Student<\/span>(<span class=\"hljs-string\">\"Charlie\"<\/span>, <span class=\"hljs-number\">20<\/span>),\r\n    <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Student<\/span>(<span class=\"hljs-string\">\"David\"<\/span>, <span class=\"hljs-number\">21<\/span>)\r\n);\r\n\r\nMap&lt;Integer, List&lt;Student&gt;&gt; groupedByAge = students.stream()\r\n    .collect(Collectors.groupingBy(Student::getAge));\r\n\r\ngroupedByAge.forEach((age, studentList) -&gt; {\r\n    System.out.println(<span class=\"hljs-string\">\"Students with age \"<\/span> + age + <span class=\"hljs-string\">\":\"<\/span>);\r\n    studentList.forEach(student -&gt; {\r\n        System.out.println(<span class=\"hljs-string\">\"- \"<\/span> + student.getName());\r\n    });\r\n});\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306f\u3001\u5b66\u751f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5e74\u9f62\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u3001\u305d\u308c\u305e\u308c\u306e\u5e74\u9f62\u5c64\u306b\u5bfe\u5fdc\u3059\u308b\u5b66\u751f\u30ea\u30b9\u30c8\u3092\u51fa\u529b\u3057\u307e\u3059\u3002groupBy\u30e1\u30bd\u30c3\u30c9\u306f\u30b3\u30fc\u30c9\u306e\u8ad6\u7406\u3092\u7c21\u7d20\u5316\u3057\u3001\u53ef\u8aad\u6027\u3068\u4fdd\u5b88\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306b\u304a\u3044\u3066\u3001List\u306egroupBy\u30e1\u30bd\u30c3\u30c9\u306f\u901a\u5e38\u3001Stream API\u306egroupBy\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066List\u5185\u306e\u8981\u7d20\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002\u5177\u4f53\u7684\u306a\u6a5f\u80fd\u306f\u3001List\u5185\u306e\u8981\u7d20\u3092\u7279\u5b9a\u306e\u6761\u4ef6\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u3001 [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2022,42,127,1592,160],"class_list":["post-6535","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-groupby","tag-java","tag-list","tag-stream-api","tag-160"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java 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