{"id":202755,"date":"2025-05-22T10:51:42","date_gmt":"2025-05-22T02:51:42","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202755\/"},"modified":"2025-05-22T10:51:42","modified_gmt":"2025-05-22T02:51:42","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8java%e4%b8%ad%e4%bd%bf%e7%94%a8lambda%e8%a1%a8%e8%be%be%e5%bc%8f%e4%bd%9c%e4%b8%ba%e5%8f%82%e6%95%b0%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202755\/","title":{"rendered":"\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\uff1f<\/h1>\n<p>\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u8981\u52aa\u529b\uff0c\u4f46\u662f\u4e0d\u8981\u6025\uff01\u4eca\u5929\u7684\u8fd9\u7bc7\u6587\u7ae0<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\uff1f\u300b<\/span>\u5c06\u4f1a\u4ecb\u7ecd\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u60f3\u6df1\u5165\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\uff0c\u53ef\u4ee5\u5173\u6ce8\u6211\uff01\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\u7684\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u80fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n<p>Java \u4e2d\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\u7684\u65b9\u6cd5\uff1a\u7f16\u5199\u4e00\u4e2a lambda \u8868\u8fbe\u5f0f\uff0c\u7b26\u5408\u51fd\u6570\u5f0f\u63a5\u53e3\uff08\u4ec5\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\uff09\u3002\u5c06 lambda \u8868\u8fbe\u5f0f\u5206\u914d\u7ed9\u51fd\u6570\u5f0f\u63a5\u53e3\u53d8\u91cf\u3002\u5c06\u6b64\u53d8\u91cf\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u9700\u8981\u51fd\u6570\u5f0f\u63a5\u53e3\u4f5c\u4e3a\u53c2\u6570\u7684\u65b9\u6cd5\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729938942671cc5fe4e21b.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570<\/strong><\/p>\n<p>Java 8 \u5f15\u5165\u4e86 lambda \u8868\u8fbe\u5f0f\uff0c\u5b83\u5141\u8bb8\u4ee5\u7b80\u6d01\u7684\u65b9\u5f0f\u7f16\u5199\u533f\u540d\u51fd\u6570\u3002Lambda \u8868\u8fbe\u5f0f\u53ef\u7528\u4e8e\u8bb8\u591a\u573a\u666f\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u65b9\u6cd5\u3002<\/p>\n<p><strong>Lambda \u8868\u8fbe\u5f0f\u8bed\u6cd5<\/strong><\/p>\n<p>Lambda \u8868\u8fbe\u5f0f\u7531\u4e09\u4e2a\u90e8\u5206\u7ec4\u6210\uff1a<\/p>\n<ul>\n<li><strong>\u53c2\u6570\u5217\u8868\uff1a<\/strong>\u53ef\u9009\uff0c\u7528\u5706\u62ec\u53f7\u62ec\u8d77\u6765\u3002<\/li>\n<li><strong>\u7bad\u5934\uff08-&gt;\uff09\uff1a<\/strong>\u5c06\u53c2\u6570\u5217\u8868\u4e0e\u51fd\u6570\u4f53\u5206\u9694\u5f00\u3002<\/li>\n<li><strong>\u51fd\u6570\u4f53\uff1a<\/strong>\u53ef\u7528\u5927\u62ec\u53f7\u5305\u88f9\u7684\u4ee3\u7801\u5757\u6216\u5355\u4e2a\u8868\u8fbe\u5f0f\u8868\u793a\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b lambda \u8868\u8fbe\u5f0f\u8868\u793a\u4e00\u4e2a\u63a5\u53d7\u4e00\u4e2a\u6574\u6570\u4f5c\u4e3a\u53c2\u6570\u5e76\u8fd4\u56de\u5176\u5e73\u65b9\u503c\u7684\u51fd\u6570\uff1a<\/p>\n<pre>(x) -&gt; x * x<\/pre>\n<p><strong>\u5c06 Lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012<\/strong><\/p>\n<p>\u8981\u5c06 lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u65b9\u6cd5\uff0c\u53ea\u9700\u5c06 lambda \u8868\u8fbe\u5f0f\u5206\u914d\u7ed9\u7b26\u5408\u51fd\u6570\u5f0f\u63a5\u53e3\uff08\u5373\u53ea\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\uff09\u7684\u53d8\u91cf\u5373\u53ef\u3002\u7136\u540e\uff0c\u5c06\u8be5\u53d8\u91cf\u4f20\u9012\u7ed9\u65b9\u6cd5\u3002<\/p>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5b9e\u6218\u6848\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5c06 lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u65b9\u6cd5\uff1a<\/p>\n<pre>import java.util.Arrays;\nimport java.util.List;\n\npublic class LambdaAsParameter {\n\n    public static void main(String[] args) {\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u6574\u6570\u5217\u8868\n        List&lt;Integer&gt; numbers = Arrays.asList(1, 2, 3, 4, 5);\n\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u8868\u793a\u4e00\u4e2a\u63a5\u53d7\u6574\u6570\u5e76\u8fd4\u56de\u5e03\u5c14\u503c\u7684\u65b9\u6cd5\n        Predicate&lt;Integer&gt; isEven = x -&gt; x % 2 == 0;\n\n        \/\/ \u5c06 lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9 filter() \u65b9\u6cd5\n        List&lt;Integer&gt; evenNumbers = numbers.stream()\n                .filter(isEven)\n                .toList();\n\n        \/\/ \u6253\u5370\u5076\u6570\u5217\u8868\n        System.out.println(evenNumbers);\n    }\n}<\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>Predicate<\/code> \u63a5\u53e3\u4ee3\u8868\u4e00\u4e2a\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u5b83\u63a5\u53d7\u4e00\u4e2a\u6574\u6570\u5e76\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\u3002\u6211\u4eec\u5c06 lambda \u8868\u8fbe\u5f0f <code>x -&gt; x % 2 == 0<\/code> \u5206\u914d\u7ed9 <code>isEven<\/code> \u53d8\u91cf\uff0c\u7136\u540e\u5c06\u5176\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9 <code>filter()<\/code> \u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u8fc7\u6ee4\u5217\u8868\u5e76\u8fd4\u56de\u6ee1\u8db3\u7ed9\u5b9a\u6761\u4ef6\u7684\u5143\u7d20\uff08\u672c\u4f8b\u4e2d\u4e3a\u5076\u6570\uff09\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6587\u7ae0\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u5728Java\u4e2d\u4f7f\u7528Lambda&#46;&#46;&#46;<\/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-202755","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202755","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=202755"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202755\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202755"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202755"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202755"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}