{"id":9784,"date":"2024-03-15T03:45:07","date_gmt":"2024-03-14T18:45:07","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aestream%e3%81%a7groupby%e3%82%92%e4%bd%bf%e3%81%86%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%e3%80%82\/"},"modified":"2025-08-04T03:41:08","modified_gmt":"2025-08-03T18:41:08","slug":"java%e3%81%aestream%e3%81%a7groupby%e3%82%92%e4%bd%bf%e3%81%86%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aestream%e3%81%a7groupby%e3%82%92%e4%bd%bf%e3%81%86%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%e3%80%82\/","title":{"rendered":"Java Stream 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class=\"post-pre\"><code>List&lt;Person&gt; persons = Arrays.asList(\r\n    <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">\"Alice\"<\/span>, <span class=\"hljs-number\">25<\/span>),\r\n    <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">\"Bob\"<\/span>, <span class=\"hljs-number\">30<\/span>),\r\n    <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">\"Charlie\"<\/span>, <span class=\"hljs-number\">25<\/span>),\r\n    <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Person<\/span>(<span class=\"hljs-string\">\"David\"<\/span>, <span class=\"hljs-number\">30<\/span>)\r\n);\r\n\r\nMap&lt;Integer, List&lt;Person&gt;&gt; groupedByAge = persons.stream()\r\n    .collect(Collectors.groupingBy(Person::getAge));\r\n\r\ngroupedByAge.forEach((age, people) -&gt; {\r\n    System.out.println(<span class=\"hljs-string\">\"Age \"<\/span> + age + <span class=\"hljs-string\">\": \"<\/span> + people);\r\n});\r\n<\/code><\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u307e\u305aList\u3092Stream\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306bstream\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3001\u6b21\u306bcollect\u30e1\u30bd\u30c3\u30c9\u3068groupingBy\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30b0\u30eb\u30fc\u30d7\u5316\u3092\u884c\u3044\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001forEach\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5404\u30b0\u30eb\u30fc\u30d7\u3092\u7e70\u308a\u8fd4\u3057\u3001\u7d50\u679c\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<p>\u6ce8\u610f\uff1a\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001Person\u30af\u30e9\u30b9\u306f\u5e74\u9f62\u5c5e\u6027\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306egetAge\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306eStream\u3067\u306f\u3001\u30b9\u30c8\u30ea\u30fc\u30e0\u5185\u306e\u8981\u7d20\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\u305f\u3081\u306b\u3001groupBy\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002groupBy\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u8981\u7d20\u306e\u30ad\u30fc\u3092\u62bd\u51fa\u3059\u308b\u305f\u3081\u306bFunction\u3092\u53d7\u3051\u53d6\u308a\u3001\u30b0\u30eb\u30fc\u30d7\u5316\u3055\u308c\u305f\u5024\u3092\u30ad [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2022,42,1592,1165,403],"class_list":["post-9784","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-groupby","tag-java","tag-stream-api","tag-1165","tag-403"],"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 Stream API\u3067groupBy\uff01\u30b0\u30eb\u30fc\u30d7\u5316\u51e6\u7406\u306e\u57fa\u672c\u3068\u5b9f\u8df5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java Stream 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