{"id":203689,"date":"2025-05-22T13:53:03","date_gmt":"2025-05-22T05:53:03","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203689\/"},"modified":"2025-05-22T13:53:03","modified_gmt":"2025-05-22T05:53:03","slug":"%e6%b5%81%e4%b8%ad%e7%9a%84-foreach-%e5%92%8c-map-%e6%9c%89%e4%bb%80%e4%b9%88%e5%8c%ba%e5%88%ab%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203689\/","title":{"rendered":"\u6d41\u4e2d\u7684 forEach \u548c map \u6709\u4ec0\u4e48\u533a\u522b\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u6d41\u4e2d\u7684 forEach \u548c map \u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u6d41\u4e2d\u7684 forEach \u548c map \u6709\u4ec0\u4e48\u533a\u522b\uff1f\u300b<\/span>\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\uff0c\u6216\u8005\u662f\u5bf9\u6587\u7ae0<\/span>\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01<\/p>\n

<\/p>\n

foreach<\/strong>\uff1a\u5bf9\u6d41\u7684\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u64cd\u4f5c\u4f46\u4e0d\u8f6c\u6362\u6216\u8fd4\u56de\u6570\u636e\u7684\u7ec8\u7aef\u64cd\u4f5c\u3002<\/p>\n

map<\/strong>\uff1a\u8f6c\u6362\u6d41\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u5e76\u8fd4\u56de\u8f6c\u6362\u5143\u7d20\u7684\u65b0\u6d41\u3002<\/p>\n

\u5e26\u6709\u5217\u8868\u7684\u57fa\u672c foreach<\/p>\n

import java.util.arrays;\nimport java.util.list;\n\npublic class foreachexample {\n    public static void main(string[] args) {\n        list<string> names = arrays.aslist(\"alice\", \"bob\", \"charlie\");\n\n        \/\/ print each name using foreach\n        names.foreach(name -> system.out.println(name));\n    }\n}\n\n<\/pre>\n
\u793a\u4f8b<\/strong><\/p>\n
List<String> names = Arrays.asList(\"Alice\", \"Bob\");\nnames.stream().forEach(System.out::println); \/\/ Simply prints each name\n\nList<Integer> nameLengths = names.stream()\n                                 .map(String::length) \/\/ Transforms each name to its length\n                                 .collect(Collectors.toList());\n\n<\/pre>\n
\u4eca\u5929\u5173\u4e8e\u300a\u6d41\u4e2d\u7684 forEach \u548c map \u6709\u4ec0\u4e48\u533a\u522b\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n
      \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb\u5220\u9664<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6d41\u4e2d\u7684 forEach \u548c ma...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-203689","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203689","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=203689"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203689\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203689"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203689"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203689"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}