{"id":72599,"date":"2024-02-21T11:24:12","date_gmt":"2024-02-21T03:24:12","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=72599"},"modified":"2024-02-21T11:25:53","modified_gmt":"2024-02-21T03:25:53","slug":"java-%e4%b8%ad%e7%9a%84lambda%e8%a1%a8%e8%be%be%e5%bc%8f%e5%92%8c%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/72599.html","title":{"rendered":"Java \u4e2d\u7684Lambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b"},"content":{"rendered":"

\"Java<\/p>\n

### Java \u4e2d\u7684Lambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b<\/strong><\/p>\n

\u5728\u8ba8\u8bbaJava\u4e2d\u7684Lambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b<\/strong>\u65f6\uff0c\u6211\u4eec\u9996\u5148\u8981\u660e\u786e\u4e24\u8005\u7684\u6838\u5fc3\u3002Lambda\u8868\u8fbe\u5f0f<\/strong>\u662f\u4e00\u79cd\u7b80\u6d01\u7684\u8868\u8fbe\u65b9\u5f0f\uff0c\u5141\u8bb8\u6211\u4eec\u4ee5\u533f\u540d\u51fd\u6570\u7684\u5f62\u5f0f\u6765\u8868\u793a\u4e00\u4e2a\u63a5\u53e3\u7684\u5b9e\u73b0\uff0c\u4e3b\u8981\u7528\u4e8e\u521b\u5efa\u7b80\u5355\u7684\u51fd\u6570\u5bf9\u8c61\u3001\u7b80\u5316\u4ee3\u7801\u7684\u7f16\u5199\u3002\u51fd\u6570\u5f0f\u7f16\u7a0b<\/strong>\u5219\u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u5f0f\uff0c\u5f3a\u8c03\u5c06\u8ba1\u7b97\u8fc7\u7a0b\u5206\u89e3\u4e3a\u53ef\u590d\u7528\u51fd\u6570\u7684\u96c6\u5408\uff0c\u63d0\u5021\u4f7f\u7528\u51fd\u6570\u4f5c\u4e3a\u4e00\u7b49\u516c\u6c11\uff0c\u901a\u8fc7\u4f20\u9012\u3001\u8fd4\u56de\u51fd\u6570\u589e\u5f3a\u4ee3\u7801\u7684\u62bd\u8c61\u7a0b\u5ea6\u548c\u590d\u7528\u6027\u3002\u8fd9\u4e24\u8005\u5728Java\u4e2d\u7684\u7ed3\u5408\u4f7f\u7528\uff0c\u4e3aJava\u5e26\u6765\u4e86\u66f4\u52a0\u4e30\u5bcc\u7684\u8868\u8fbe\u80fd\u529b\u548c\u66f4\u9ad8\u7684\u4ee3\u7801\u62bd\u8c61\u7ea7\u522b\u3002\u7279\u522b\u662f\u5728\u5904\u7406\u96c6\u5408\u3001\u6d41\u5f0f\u8ba1\u7b97\u65f6\uff0cLambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u4f18\u52bf\u5c24\u4e3a\u660e\u663e\uff0c\u5b83\u4eec\u4f7f\u5f97\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3001\u6613\u8bfb\uff0c\u540c\u65f6\u63d0\u9ad8\u4e86\u5f00\u53d1\u6548\u7387\u548c\u7a0b\u5e8f\u7684\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n

\u4e00\u3001Lambda\u8868\u8fbe\u5f0f\u7684\u57fa\u672c\u8bed\u6cd5<\/strong><\/p>\n

Lambda\u8868\u8fbe\u5f0f\u5728Java\u4e2d\u7684\u5f15\u5165\uff0c\u4e3b\u8981\u662f\u4e3a\u4e86\u7b80\u5316\u90a3\u4e9b\u53ea\u6709\u5355\u4e00\u65b9\u6cd5\u7684\u63a5\u53e3\uff08\u5373\u51fd\u6570\u5f0f\u63a5\u53e3\uff09\u7684\u5b9e\u73b0\u65b9\u5f0f\u3002Lambda\u7684\u57fa\u672c\u8bed\u6cd5\u7ed3\u6784\u662f `(\u53c2\u6570\u5217\u8868) -> { \u8868\u8fbe\u5f0f }`\u3002\u5176\u4e2d\uff0c\u53c2\u6570\u5217\u8868\u7684\u7c7b\u578b\u53ef\u4ee5\u88ab\u81ea\u52a8\u63a8\u65ad\uff0c\u8868\u8fbe\u5f0f\u90e8\u5206\u5219\u53ef\u4ee5\u662f\u5355\u4e2a\u8868\u8fbe\u5f0f\u4e5f\u53ef\u4ee5\u662f\u4e00\u4e2a\u4ee3\u7801\u5757\u3002<\/p>\n

\u4e8c\u3001\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u6838\u5fc3\u6982\u5ff5<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\uff08Functional Programming, FP\uff09\u66f4\u591a\u5730\u4fa7\u91cd\u4e8e\u201c\u505a\u4ec0\u4e48\u201d\u800c\u4e0d\u662f\u201c\u5982\u4f55\u505a\u201d\u3002\u5b83\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\uff0c\u4fa7\u91cd\u4e8e\u58f0\u660e\u5f0f\u7f16\u7a0b\u800c\u975e\u547d\u4ee4\u5f0f\u7f16\u7a0b\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u544a\u8bc9\u8ba1\u7b97\u673a\u9700\u8981\u5b8c\u6210\u4ec0\u4e48\u4efb\u52a1\u800c\u4e0d\u662f\u5982\u4f55\u5b8c\u6210\u8fd9\u4e9b\u4efb\u52a1\u3002\u8fd9\u79cd\u8303\u5f0f\u652f\u6301\u9ad8\u9636\u51fd\u6570\uff0c\u5373\u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u5176\u4ed6\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6216\u8005\u5c06\u51fd\u6570\u4f5c\u4e3a\u8fd4\u56de\u7ed3\u679c\u3002<\/p>\n

\u4e09\u3001Lambda\u8868\u8fbe\u5f0f\u7684\u5e94\u7528\u573a\u666f<\/strong><\/p>\n

Lambda\u8868\u8fbe\u5f0f\u6700\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\u4e4b\u4e00\u662f\u7b80\u5316\u90a3\u4e9b\u5177\u6709\u5355\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\uff08\u51fd\u6570\u5f0f\u63a5\u53e3\uff09\u7684\u5b9e\u73b0\uff0c\u5982`Runnable`\u3001`Callable`\u3001`Comparator`\u7b49\u3002\u5728Java 8\u4e2d\u5f15\u5165\u7684Stream API\u4e2d\uff0cLambda\u8868\u8fbe\u5f0f\u7684\u4f7f\u7528\u5c24\u4e3a\u9891\u7e41\uff0c\u5b83\u4f7f\u5f97\u5bf9\u96c6\u5408\u7684\u64cd\u4f5c\u66f4\u52a0\u76f4\u89c2\u548c\u94fe\u5f0f\u3002<\/p>\n

– \u96c6\u5408\u7684\u904d\u5386<\/strong>\uff1a\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u6781\u5927\u7b80\u5316\u96c6\u5408\u904d\u5386\u7684\u4ee3\u7801\u91cf\u3002<\/p>\n

– \u6570\u636e\u8fc7\u6ee4<\/strong>\uff1a\u914d\u5408Stream API\uff0cLambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u5b9e\u73b0\u975e\u5e38\u7075\u6d3b\u7684\u6570\u636e\u8fc7\u6ee4\u903b\u8f91\u3002<\/p>\n

\u56db\u3001\u51fd\u6570\u5f0f\u63a5\u53e3\u7684\u89d2\u8272<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u63a5\u53e3\u662f\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u57fa\u77f3\uff0c\u5728Java\u4e2d\uff0c\u4efb\u4f55\u63a5\u53e3\u5982\u679c\u53ea\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\uff0c\u90a3\u4e48\u5b83\u5c31\u662f\u4e00\u4e2a\u51fd\u6570\u5f0f\u63a5\u53e3\u3002Java 8\u5f15\u5165\u4e86`@FunctionalInterface`\u6ce8\u89e3\u6765\u663e\u5f0f\u58f0\u660e\u4e00\u4e2a\u63a5\u53e3\u662f\u51fd\u6570\u5f0f\u63a5\u53e3\u3002\u6700\u5e38\u7528\u7684\u51fd\u6570\u5f0f\u63a5\u53e3\u5305\u62ec`Function`\u3001`Predicate`\u3001`Consumer`\u7b49\u3002<\/p>\n

\u4e94\u3001\u5229\u7528Lambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316\u4ee3\u7801<\/strong><\/p>\n

Lambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7ed3\u5408\u4f7f\u7528\uff0c\u4e0d\u4ec5\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3001\u6613\u4e8e\u7406\u89e3\uff0c\u8fd8\u80fd\u63d0\u5347\u4ee3\u7801\u7684\u62bd\u8c61\u5c42\u6b21\u548c\u590d\u7528\u6027\u3002\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u8fd9\u79cd\u7f16\u7a0b\u98ce\u683c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u5730\u5b9e\u73b0\u89e3\u8026\u548c\u6a21\u5757\u5316\u8bbe\u8ba1\u3002<\/p>\n

– \u4ee3\u7801\u7b80\u6d01\u6027<\/strong>\uff1aLambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u51cf\u5c11\u5197\u4f59\u4ee3\u7801\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3002<\/p>\n

– \u6613\u4e8e\u5e76\u884c\u8ba1\u7b97<\/strong>\uff1a\u914d\u5408Stream API\uff0cLambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u4f7f\u5f97\u5e76\u884c\u8ba1\u7b97\u53d8\u5f97\u66f4\u52a0\u5bb9\u6613\u548c\u76f4\u89c2\u3002<\/p>\n

\u7ed3\u8bba<\/strong><\/p>\n

Java\u4e2d\u7684Lambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u662f\u63d0\u5347\u4ee3\u7801\u7b80\u6d01\u6027\u3001\u53ef\u8bfb\u6027\u53ca\u5f00\u53d1\u6548\u7387\u7684\u5f3a\u5927\u5de5\u5177\u3002\u901a\u8fc7\u7406\u89e3\u548c\u5408\u7406\u5e94\u7528\u8fd9\u4e24\u4e2a\u6982\u5ff5\uff0c\u53ef\u4ee5\u5927\u5e45\u5ea6\u63d0\u5347Java\u7a0b\u5e8f\u7684\u8868\u8fbe\u80fd\u529b\u548c\u6027\u80fd\u3002\u968f\u7740Java\u8bed\u8a00\u672c\u8eab\u7684\u4e0d\u65ad\u8fdb\u5316\u548c\u5b8c\u5584\uff0c\u8fd9\u4e24\u4e2a\u7279\u6027\u7684\u5e94\u7528\u8303\u56f4\u548c\u6df1\u5ea6\u5c06\u4f1a\u66f4\u52a0\u5e7f\u6cdb\uff0c\u5bf9Java\u5f00\u53d1\u8005\u800c\u8a00\uff0c\u638c\u63e1\u5b83\u4eec\u5df2\u7ecf\u6210\u4e3a\u4e86\u4e00\u9879\u5fc5\u5907\u7684\u6280\u80fd\u3002<\/p>\n

\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

\u4ec0\u4e48\u662fLambda\u8868\u8fbe\u5f0f\uff1f<\/strong><\/p>\n

Lambda\u8868\u8fbe\u5f0f\u662fJava 8\u4e2d\u5f15\u5165\u7684\u4e00\u79cd\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7279\u6027\uff0c\u53ef\u4ee5\u5c06\u51fd\u6570\u4f5c\u4e3a\u65b9\u6cd5\u7684\u53c2\u6570\u4f20\u9012\u8fdb\u53bb\uff0c\u4f7f\u4ee3\u7801\u66f4\u4e3a\u7b80\u6d01\u548c\u6613\u8bfb\u3002Lambda\u8868\u8fbe\u5f0f\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u533f\u540d\u51fd\u6570\u3002
\nLambda\u8868\u8fbe\u5f0f\u4f7f\u7528\u7b80\u5355\u7684\u8bed\u6cd5\u4ee3\u66ff\u4f20\u7edf\u7684\u533f\u540d\u7c7b\uff0c\u53ef\u4ee5\u589e\u52a0\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7b80\u6d01\u6027\u3002\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u7b80\u5316\u4ee3\u7801\u91cf\u5e76\u4f7f\u5176\u66f4\u6613\u7ef4\u62a4\u3002<\/p>\n

Lambda\u8868\u8fbe\u5f0f\u7684\u8bed\u6cd5\u662f\u600e\u6837\u7684\uff1f<\/strong><\/p>\n

Lambda\u8868\u8fbe\u5f0f\u7684\u8bed\u6cd5\u7531\u4e09\u4e2a\u90e8\u5206\u7ec4\u6210\uff1a\u53c2\u6570\u5217\u8868\u3001\u7bad\u5934\u7b26\u53f7\u548c\u65b9\u6cd5\u4f53\u3002\u53c2\u6570\u5217\u8868\u5bf9\u5e94\u4e8e\u65b9\u6cd5\u7684\u53c2\u6570\uff0c\u5728\u7bad\u5934\u7b26\u53f7”->”\u4e4b\u524d\uff1b\u7bad\u5934\u7b26\u53f7\u5219\u5206\u9694\u53c2\u6570\u5217\u8868\u548c\u65b9\u6cd5\u4f53\uff1b\u65b9\u6cd5\u4f53\u5219\u5305\u542b\u4e86Lambda\u8868\u8fbe\u5f0f\u8981\u6267\u884c\u7684\u4ee3\u7801\u3002
\n\u4f8b\u5982\uff0c(parameter) -> expression \u6216\u8005 (parameter) -> {statements;}\u3002\u5982\u679cLambda\u8868\u8fbe\u5f0f\u53ea\u6709\u4e00\u4e2a\u53c2\u6570\uff0c\u751a\u81f3\u53ef\u4ee5\u7701\u7565\u53c2\u6570\u7684\u62ec\u53f7\uff0c\u4f8b\u5982\uff1aparameter -> expression\u3002<\/p>\n

Java\u4e2d\u51fd\u6570\u5f0f\u63a5\u53e3\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n

Java\u4e2d\u7684\u51fd\u6570\u5f0f\u63a5\u53e3\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u53ea\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\u3002\u51fd\u6570\u5f0f\u63a5\u53e3\u53ef\u4ee5\u4f7f\u7528@FunctionalInterface\u6ce8\u89e3\u8fdb\u884c\u6807\u8bb0\uff0c\u786e\u4fdd\u7f16\u8bd1\u5668\u4e0d\u4f1a\u9519\u8bef\u5730\u5c06\u5176\u6807\u8bb0\u4e3a\u975e\u51fd\u6570\u5f0f\u63a5\u53e3\u3002
\n\u51fd\u6570\u5f0f\u63a5\u53e3\u7684\u5b58\u5728\u4f7f\u5f97\u53ef\u4ee5\u901a\u8fc7Lambda\u8868\u8fbe\u5f0f\u6765\u8868\u793a\u8be5\u63a5\u53e3\u7684\u5b9e\u73b0\uff0c\u4ece\u800c\u5b9e\u73b0\u66f4\u4e3a\u7b80\u6d01\u548c\u4f18\u96c5\u7684\u4ee3\u7801\u7f16\u5199\u3002Java\u4e2d\u7684\u5e38\u89c1\u51fd\u6570\u5f0f\u63a5\u53e3\u6709Runnable\u3001Comparator\u7b49\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"### Java \u4e2d\u7684Lambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b \u5728\u8ba8\u8bbaJava\u4e2d\u7684Lambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u65f6\uff0c\u6211\u4eec […]","protected":false},"author":1,"featured_media":72603,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/72599"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=72599"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/72599\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/72603"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=72599"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=72599"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=72599"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}