{"id":38140,"date":"2024-11-26T09:38:52","date_gmt":"2024-11-26T01:38:52","guid":{"rendered":"https:\/\/fwq.ai\/blog\/38140\/"},"modified":"2024-11-26T09:38:52","modified_gmt":"2024-11-26T01:38:52","slug":"java%e6%80%8e%e4%b9%88%e5%b0%86%e6%95%b0%e7%bb%84%e5%88%86%e7%bb%84%e6%b1%82%e5%92%8c","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/38140\/","title":{"rendered":"java\u600e\u4e48\u5c06\u6570\u7ec4\u5206\u7ec4\u6c42\u548c"},"content":{"rendered":"<blockquote><p>\n  java \u4e2d\u5206\u7ec4\u6570\u7ec4\u5e76\u6c42\u548c\u7684\u65b9\u6cd5\u662f\uff1a\u521b\u5efa\u6d41\uff1a\u4f7f\u7528 stream api \u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u6d41\u3002\u5206\u7ec4\u5143\u7d20\uff1a\u4f7f\u7528 groupingby() \u65b9\u6cd5\u6839\u636e\u7279\u5b9a\u6807\u51c6\u5c06\u5143\u7d20\u5206\u7ec4\u3002\u8ba1\u7b97\u6bcf\u7ec4\u7684\u548c\uff1a\u4f7f\u7528 summingint() \u65b9\u6cd5\u8ba1\u7b97\u6bcf\u7ec4\u5143\u7d20\u7684\u548c\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/14\/2024111409241931341.jpg\" class=\"aligncenter\" title=\"java\u600e\u4e48\u5c06\u6570\u7ec4\u5206\u7ec4\u6c42\u548c\u63d2\u56fe\" alt=\"java\u600e\u4e48\u5c06\u6570\u7ec4\u5206\u7ec4\u6c42\u548c\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4f7f\u7528 Java \u5c06\u6570\u7ec4\u5206\u7ec4\u5e76\u6c42\u548c<\/strong><\/p>\n<p>\u4e3a\u4e86\u5c06\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u6309\u7279\u5b9a\u6807\u51c6\u5206\u7ec4\u5e76\u8ba1\u7b97\u6bcf\u7ec4\u7684\u548c\uff0cJava \u63d0\u4f9b\u4e86 Stream API\uff0c\u901a\u8fc7\u4f7f\u7528\u5176 Collectors.groupingBy() \u548c Collectors.summingInt() \u65b9\u6cd5\uff0c\u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u3002<\/p>\n<p><strong>\u6b65\u9aa4\uff1a<\/strong><\/p>\n<ol>\n<li> <strong>\u521b\u5efa\u6d41\uff1a<\/strong>\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u6d41\uff0c\u4ee5\u4fbf\u53ef\u4ee5\u4f7f\u7528 Stream API \u7684\u529f\u80fd\u3002<\/li>\n<li> <strong>\u5206\u7ec4\u5143\u7d20\uff1a<\/strong>\u4f7f\u7528 groupingBy() \u65b9\u6cd5\u6839\u636e\u6307\u5b9a\u7684\u6807\u51c6\u5c06\u5143\u7d20\u5206\u7ec4\u3002<\/li>\n<li> <strong>\u8ba1\u7b97\u6bcf\u7ec4\u7684\u548c\uff1a<\/strong>\u4f7f\u7528 summingInt() \u65b9\u6cd5\u8ba1\u7b97\u6bcf\u7ec4\u5143\u7d20\u7684\u548c\u3002<\/li>\n<\/ol>\n<p><strong>\u4ee3\u7801\u793a\u4f8b\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>import java.util.Arrays;\nimport java.util.Map;\nimport java.util.stream.Collectors;\n\npublic class GroupAndSumArray {\n\n    public static void main(String[] args) {\n        int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};\n\n        \/\/ \u5206\u7ec4\u5e76\u5bf9\u5206\u7ec4\u6c42\u548c\n        Map&lt;Integer, Integer&gt; groupedSum = Arrays.stream(numbers)\n                .boxed() \/\/ \u5c06 int[] \u8f6c\u6362\u4e3a Integer[]\n                .collect(Collectors.groupingBy(Integer::intValue, Collectors.summingInt(Integer::intValue)));\n\n        \/\/ \u6253\u5370\u5206\u7ec4\u540e\u7684\u7ed3\u679c\n        for (Map.Entry&lt;Integer, Integer&gt; entry : groupedSum.entrySet()) {\n            System.out.println(String.format(\"Key: %d, Sum: %d\", entry.getKey(), entry.getValue()));\n        }\n    }\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u8f93\u51fa\uff1a<\/strong><\/p>\n<pre>Key: 1, Sum: 10\nKey: 2, Sum: 20\nKey: 3, Sum: 30\nKey: 4, Sum: 40\nKey: 5, Sum: 50<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6570\u7ec4 numbers \u88ab\u5206\u7ec4\u4e3a\u8fde\u7eed\u7684\u6574\u6570\u8303\u56f4\uff0c\u5e76\u8ba1\u7b97\u4e86\u6bcf\u4e2a\u8303\u56f4\u5185\u7684\u6570\u5b57\u7684\u548c\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u5c06\u6570\u7ec4\u5206\u7ec4\u6c42\u548c\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>java \u4e2d\u5206\u7ec4\u6570\u7ec4\u5e76\u6c42\u548c\u7684\u65b9\u6cd5\u662f\uff1a\u521b\u5efa\u6d41\uff1a\u4f7f\u7528 stream api \u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u6d41\u3002\u5206\u7ec4\u5143\u7d20\uff1a\u4f7f\u7528 groupingby() \u65b9\u6cd5\u6839\u636e\u7279\u5b9a\u6807\u51c6\u5c06\u5143\u7d20\u5206\u7ec4\u3002\u8ba1\u7b97\u6bcf\u7ec4\u7684\u548c\uff1a\u4f7f\u7528 summingint() \u65b9\u6cd5\u8ba1\u7b97\u6bcf\u7ec4\u5143\u7d20\u7684\u548c\u3002 \u5982\u4f55\u4f7f\u7528 Java \u5c06\u6570\u7ec4\u5206\u7ec4\u5e76\u6c42\u548c \u4e3a\u4e86\u5c06\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u6309\u7279\u5b9a\u6807\u51c6\u5206\u7ec4\u5e76\u8ba1\u7b97\u6bcf\u7ec4\u7684\u548c\uff0cJava \u63d0\u4f9b\u4e86 Stream API\uff0c\u901a\u8fc7\u4f7f\u7528\u5176 Collectors.groupingBy() \u548c Collectors.summingInt() \u65b9\u6cd5\uff0c\u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u3002 \u6b65\u9aa4\uff1a \u521b\u5efa\u6d41\uff1a\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u6d41\uff0c\u4ee5\u4fbf\u53ef\u4ee5\u4f7f\u7528 Stream API \u7684\u529f\u80fd\u3002 \u5206\u7ec4\u5143\u7d20\uff1a\u4f7f\u7528 groupingBy() \u65b9\u6cd5\u6839\u636e\u6307\u5b9a\u7684\u6807\u51c6\u5c06\u5143\u7d20\u5206\u7ec4\u3002 \u8ba1\u7b97\u6bcf\u7ec4\u7684\u548c\uff1a\u4f7f\u7528 summingInt() \u65b9\u6cd5\u8ba1\u7b97\u6bcf\u7ec4\u5143\u7d20\u7684\u548c\u3002 \u4ee3\u7801\u793a\u4f8b\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b import java.util.Arrays; import java.util.Map; import java.util.stream.Collectors; public class GroupAndSumArray { public static void main(String[] args) { int[] numbers = {1, 2, 3, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-38140","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38140","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=38140"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38140\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=38140"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=38140"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=38140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}