{"id":203073,"date":"2025-05-22T12:31:20","date_gmt":"2025-05-22T04:31:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203073\/"},"modified":"2025-05-22T12:31:20","modified_gmt":"2025-05-22T04:31:20","slug":"lambda%e8%a1%a8%e8%be%be%e5%bc%8f%e4%b8%8e%e6%b5%81%e5%bc%8f%e5%a4%84%e7%90%86%e7%9a%84%e7%9a%84%e9%9b%86%e6%88%90%ef%bc%8c%e5%a6%82%e4%bd%95%e4%bc%98%e5%8c%96%e6%80%a7%e8%83%bd%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203073\/","title":{"rendered":"Lambda\u8868\u8fbe\u5f0f\u4e0e\u6d41\u5f0f\u5904\u7406\u7684\u7684\u96c6\u6210\uff0c\u5982\u4f55\u4f18\u5316\u6027\u80fd\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Lambda\u8868\u8fbe\u5f0f\u4e0e\u6d41\u5f0f\u5904\u7406\u7684\u7684\u96c6\u6210\uff0c\u5982\u4f55\u4f18\u5316\u6027\u80fd\uff1f<\/h1>\n<p>\u600e\u4e48\u5165\u95e8\u6587\u7ae0\u7f16\u7a0b\uff1f\u9700\u8981\u5b66\u4e60\u54ea\u4e9b\u77e5\u8bc6\u70b9\uff1f\u8fd9\u662f\u65b0\u624b\u4eec\u521a\u63a5\u89e6\u7f16\u7a0b\u65f6\u5e38\u89c1\u7684\u95ee\u9898\uff1b\u4e0b\u9762\u5c31\u6765\u7ed9\u5927\u5bb6\u6574\u7406\u5206\u4eab\u4e00\u4e9b\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u591f\u7ed9\u521d\u5b66\u8005\u4e00\u4e9b\u5e2e\u52a9\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u4ecb\u7ecd\u300aLambda\u8868\u8fbe\u5f0f\u4e0e\u6d41\u5f0f\u5904\u7406\u7684\u7684\u96c6\u6210\uff0c\u5982\u4f55\u4f18\u5316\u6027\u80fd\uff1f\u300b\uff0c\u6d89\u53ca\u5230\uff0c\u6709\u9700\u8981\u7684\u53ef\u4ee5\u6536\u85cf\u4e00\u4e0b<\/p>\n<p>\u6d41\u5f0f\u5904\u7406\u4e0e Lambda \u8868\u8fbe\u5f0f\u7684\u96c6\u6210\u53ef\u4ee5\u901a\u8fc7\u521b\u5efa\u4ee5\u4e0b\u9ad8\u6548\u7ba1\u9053\u6765\u63d0\u5347\u6027\u80fd\uff1a\u6570\u636e\u6e90 \u2192 \u8f6c\u6362 \u2192 \u8fc7\u6ee4 \u2192 \u8f93\u51fa\u3002Lambda \u8868\u8fbe\u5f0f\u7528\u4e8e\u8f6c\u6362\u3001\u8fc7\u6ee4\u548c\u5904\u7406\u6570\u636e\uff0c\u800c\u6d41\u5f0f\u5904\u7406\u652f\u6301\u5e76\u884c\u5316\u3001\u5ef6\u8fdf\u6267\u884c\u548c\u4ee3\u7801\u53ef\u8bfb\u6027\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241027\/1730038848671e4c40cc0cf.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Lambda \u8868\u8fbe\u5f0f\u4e0e\u6d41\u5f0f\u5904\u7406\u7684\u96c6\u6210\uff1a\u63d0\u5347\u6027\u80fd\u7684\u5b9e\u6218\u6307\u5357<\/strong><\/p>\n<p>\u5728\u73b0\u4ee3\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6d41\u5f0f\u5904\u7406\u548c lambda \u8868\u8fbe\u5f0f\u5df2\u6210\u4e3a\u63d0\u9ad8\u6570\u636e\u5904\u7406\u6548\u7387\u548c\u6027\u80fd\u7684\u5f3a\u5927\u5de5\u5177\u3002\u901a\u8fc7\u5c06\u8fd9\u4e24\u8005\u76f8\u7ed3\u5408\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u521b\u5efa\u9ad8\u6548\u3001\u53ef\u4f38\u7f29\u4e14\u6613\u4e8e\u7ef4\u62a4\u7684\u4ee3\u7801\u3002<\/p>\n<p><strong>\u4ec0\u4e48\u662f Lambda \u8868\u8fbe\u5f0f\uff1f<\/strong><\/p>\n<p>Lambda \u8868\u8fbe\u5f0f\u662f\u533f\u540d\u51fd\u6570\uff0c\u5141\u8bb8\u5f00\u53d1\u4eba\u5458\u4f7f\u7528\u66f4\u7b80\u6d01\u3001\u66f4\u5177\u8868\u73b0\u529b\u7684\u8bed\u6cd5\u7f16\u5199\u4ee3\u7801\u3002\u5b83\u4eec\u53ef\u4ee5\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u7528\u4e8e\u64cd\u4f5c\u6570\u636e\u7ed3\u6784\u6216\u5904\u7406\u6d41\u3002<\/p>\n<p><strong>\u4ec0\u4e48\u662f\u6d41\u5f0f\u5904\u7406\uff1f<\/strong><\/p>\n<p>\u6d41\u5f0f\u5904\u7406\u662f\u4e00\u79cd\u5904\u7406\u5904\u7406\u7684\u6570\u636e\u9879\u5e8f\u5217\u7684\u6280\u672f\uff0c\u800c\u65e0\u9700\u5c06\u5b83\u4eec\u5168\u90e8\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\u3002\u8fd9\u4f7f\u5f97\u5904\u7406\u5927\u6570\u636e\u96c6\u6216\u5b9e\u65f6\u6570\u636e\u6e90\u53d8\u5f97\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<p><strong>\u96c6\u6210 Lambda \u8868\u8fbe\u5f0f\u548c\u6d41\u5f0f\u5904\u7406<\/strong><\/p>\n<p>\u901a\u8fc7\u5c06 lambda \u8868\u8fbe\u5f0f\u4e0e\u6d41\u5f0f\u5904\u7406\u76f8\u7ed3\u5408\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u521b\u5efa\u4ee5\u4e0b\u7ba1\u9053\uff1a<\/p>\n<p><strong>\u2460 \u6570\u636e\u6e90 \u2192 \u2461 \u8f6c\u6362 \u2192 \u2462 \u8fc7\u6ee4 \u2192 \u2463 \u8f93\u51fa<\/strong><\/p>\n<p>\u5728\u8fd9\u6761\u7ba1\u9053\u4e2d\uff0clambda \u8868\u8fbe\u5f0f\u7528\u4e8e\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li><strong>\u8f6c\u6362\uff1a<\/strong>\u5c06\u6570\u636e\u9879\u6620\u5c04\u5230\u65b0\u683c\u5f0f\u6216\u7c7b\u578b\u3002<\/li>\n<li><strong>\u8fc7\u6ee4\uff1a<\/strong>\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u4ece\u6d41\u4e2d\u6392\u9664\u6570\u636e\u9879\u3002<\/li>\n<li><strong>\u5904\u7406\uff1a<\/strong>\u6267\u884c\u805a\u5408\u6216\u5176\u4ed6\u8ba1\u7b97\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a<\/strong><\/p>\n<p><strong>\u4efb\u52a1\uff1a<\/strong>\u4ece\u6587\u672c\u6587\u4ef6\u4e2d\u63d0\u53d6\u6240\u6709\u6570\u5b57\uff0c\u5e76\u8ba1\u7b97\u5b83\u4eec\u7684\u603b\u548c\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6848\u4f7f\u7528 Java 8\uff1a<\/strong><\/p>\n<pre>import java.nio.file.Files;\nimport java.nio.file.Paths;\nimport java.util.Arrays;\nimport java.util.stream.Stream;\n\npublic class Example {\n\n    public static void main(String[] args) throws Exception {\n        \/\/ \u8bfb\u53d6\u6587\u672c\u6587\u4ef6\n        Stream&lt;String&gt; lines = Files.lines(Paths.get(\"numbers.txt\"));\n\n        \/\/ \u8fc7\u6ee4\u51fa\u6570\u5b57\n        Stream&lt;Integer&gt; numbers = lines\n                .flatMap(s -&gt; Arrays.stream(s.split(\" \")))\n                .filter(s -&gt; {\n                    try {\n                        return Integer.parseInt(s) != null;\n                    } catch (NumberFormatException e) {\n                        return false;\n                    }\n                })\n                .map(Integer::valueOf);\n\n        \/\/ \u8ba1\u7b97\u603b\u548c\n        int sum = numbers.reduce(0, (a, b) -&gt; a + b);\n\n        \/\/ \u8f93\u51fa\u7ed3\u679c\n        System.out.println(\"\u603b\u548c\uff1a\" + sum);\n    }\n}<\/pre>\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0clambda \u8868\u8fbe\u5f0f\u7528\u4e8e\uff1a<\/p>\n<ul>\n<li>\u5c06\u6587\u672c\u884c\u4e2d\u7684\u5355\u8bcd\u6241\u5e73\u5316\u4e3a\u5355\u72ec\u7684\u5143\u7d20\u3002<\/li>\n<li>\u8fc7\u6ee4\u51fa\u975e\u6570\u5b57\u5143\u7d20\u3002<\/li>\n<li>\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u578b\u3002<\/li>\n<li>\u6267\u884c\u5f52\u7ea6\u64cd\u4f5c\u4ee5\u8ba1\u7b97\u6570\u5b57\u7684\u603b\u548c\u3002<\/li>\n<\/ul>\n<p><strong>\u6027\u80fd\u63d0\u5347<\/strong><\/p>\n<p>\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u548c\u6d41\u5f0f\u5904\u7406\u53ef\u4ee5\u5e26\u6765\u4ee5\u4e0b\u6027\u80fd\u63d0\u5347\uff1a<\/p>\n<ul>\n<li><strong>\u5e76\u884c\u5316\uff1a<\/strong>\u6d41\u5f0f\u5904\u7406\u5141\u8bb8\u5728\u591a\u6838 CPU \u4e0a\u5e76\u884c\u5904\u7406\u6570\u636e\u3002<\/li>\n<li><strong>\u5ef6\u8fdf\u6267\u884c\uff1a<\/strong>lambda \u8868\u8fbe\u5f0f\u5ef6\u8fdf\u6267\u884c\uff0c\u76f4\u5230\u6d41\u88ab\u7ec8\u7aef\u64cd\u4f5c\u89e6\u53d1\uff0c\u4ece\u800c\u63d0\u9ad8\u5185\u5b58\u5229\u7528\u7387\u3002<\/li>\n<li><strong>\u4ee3\u7801\u53ef\u8bfb\u6027\uff1a<\/strong>\u901a\u8fc7\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\uff0c\u4ee3\u7801\u53d8\u5f97\u66f4\u52a0\u7b80\u6d01\u548c\u53ef\u8bfb\uff0c\u4ece\u800c\u7b80\u5316\u4e86\u7ef4\u62a4\u548c\u8c03\u8bd5\u3002<\/li>\n<\/ul>\n<p>\u672c\u7bc7\u5173\u4e8e\u300aLambda\u8868\u8fbe\u5f0f\u4e0e\u6d41\u5f0f\u5904\u7406\u7684\u7684\u96c6\u6210\uff0c\u5982\u4f55\u4f18\u5316\u6027\u80fd\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lambda\u8868\u8fbe\u5f0f\u4e0e\u6d41\u5f0f\u5904\u7406\u7684\u7684&#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-203073","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203073","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=203073"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203073\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203073"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203073"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}