{"id":9776,"date":"2024-03-15T03:44:24","date_gmt":"2024-03-14T18:44:24","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%b0%e3%83%ab%e3%83%bc%e3%83%97%e5%8c%96%e3%81%97%e3%81%a6%e5%90%88%e8%a8%88%e3%81%99\/"},"modified":"2025-08-04T03:38:23","modified_gmt":"2025-08-03T18:38:23","slug":"java%e3%81%a7%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%b0%e3%83%ab%e3%83%bc%e3%83%97%e5%8c%96%e3%81%97%e3%81%a6%e5%90%88%e8%a8%88%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%b0%e3%83%ab%e3%83%bc%e3%83%97%e5%8c%96%e3%81%97%e3%81%a6%e5%90%88%e8%a8%88%e3%81%99\/","title":{"rendered":"Java Stream API\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u3066\u5408\u8a08\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u30c7\u30fc\u30bf\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\u305f\u3081\u306bStream API\u306eCollectors.groupingBy\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3001\u305d\u306e\u5f8c\u3001Collectors.summingInt\u3001Collectors.summingLong\u3001\u307e\u305f\u306fCollectors.summingDouble\u30e1\u30bd\u30c3\u30c9\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u30b0\u30eb\u30fc\u30d7\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306e\u5408\u8a08\u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u3001\u8907\u6570\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u542b\u307e\u308c\u308b\u30c7\u30fc\u30bf\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u7279\u5b9a\u306e\u5c5e\u6027\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u3001\u5404\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306b\u5408\u8a08\u64cd\u4f5c\u3092\u884c\u3046\u65b9\u6cd5\u3092\u793a\u3059\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.Arrays;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.List;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.Map;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.stream.Collectors;\r\n\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Item<\/span> {\r\n    String category;\r\n    <span class=\"hljs-type\">int<\/span> amount;\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">Item<\/span><span class=\"hljs-params\">(String category, <span class=\"hljs-type\">int<\/span> amount)<\/span> {\r\n        <span class=\"hljs-built_in\">this<\/span>.category = category;\r\n        <span class=\"hljs-built_in\">this<\/span>.amount = amount;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> String <span class=\"hljs-title function_\">getCategory<\/span><span class=\"hljs-params\">()<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> category;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">getAmount<\/span><span class=\"hljs-params\">()<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> amount;\r\n    }\r\n}\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Main<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        List&lt;Item&gt; items = Arrays.asList(\r\n                <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Item<\/span>(<span class=\"hljs-string\">\"A\"<\/span>, <span class=\"hljs-number\">10<\/span>),\r\n                <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Item<\/span>(<span class=\"hljs-string\">\"B\"<\/span>, <span class=\"hljs-number\">20<\/span>),\r\n                <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Item<\/span>(<span class=\"hljs-string\">\"A\"<\/span>, <span class=\"hljs-number\">30<\/span>),\r\n                <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Item<\/span>(<span class=\"hljs-string\">\"B\"<\/span>, <span class=\"hljs-number\">40<\/span>),\r\n                <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Item<\/span>(<span class=\"hljs-string\">\"A\"<\/span>, <span class=\"hljs-number\">50<\/span>)\r\n        );\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u6309\u7167 category \u5206\u7ec4\uff0c\u5e76\u5bf9\u6bcf\u4e2a\u5206\u7ec4\u7684 amount \u6c42\u548c<\/span>\r\n        Map&lt;String, Integer&gt; sumByCategory = items.stream()\r\n                .collect(Collectors.groupingBy(Item::getCategory, Collectors.summingInt(Item::getAmount)));\r\n\r\n        System.out.println(sumByCategory);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u3001\u7570\u306a\u308b\u30ab\u30c6\u30b4\u30ea\u30fc\u306e\u5408\u8a08\u3092\u542b\u3080\u30de\u30c3\u30d7\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>{A=90, B=60}\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u30c7\u30fc\u30bf\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\u305f\u3081\u306bStream API\u306eCollectors.groupingBy\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3001\u305d\u306e\u5f8c\u3001Collectors.summingInt\u3001Collectors.summin [&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":[42,1592,1165,26,1166],"class_list":["post-9776","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java","tag-stream-api","tag-1165","tag-26","tag-1166"],"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\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u3066\u5408\u8a08\u3059\u308b\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java Stream 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