{"id":202640,"date":"2025-05-22T08:02:55","date_gmt":"2025-05-22T00:02:55","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202640\/"},"modified":"2025-05-22T08:02:55","modified_gmt":"2025-05-22T00:02:55","slug":"java-%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e7%9a%84%e7%94%a8%e4%be%8b%e5%92%8c%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202640\/","title":{"rendered":"Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7528\u4f8b\u548c\u793a\u4f8b"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7528\u4f8b\u548c\u793a\u4f8b<\/h1>\n<p>\u5728IT\u884c\u4e1a\u8fd9\u4e2a\u53d1\u5c55\u66f4\u65b0\u901f\u5ea6\u5f88\u5feb\u7684\u884c\u4e1a\uff0c\u53ea\u6709\u4e0d\u505c\u6b62\u7684\u5b66\u4e60\uff0c\u624d\u4e0d\u4f1a\u88ab\u884c\u4e1a\u6240\u6dd8\u6c70\u3002\u5982\u679c\u4f60\u662f\u6587\u7ae0\u5b66\u4e60\u8005\uff0c\u90a3\u4e48\u672c\u6587\u300aJava \u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7528\u4f8b\u548c\u793a\u4f8b\u300b\u5c31\u5f88\u9002\u5408\u4f60\uff01\u672c\u7bc7\u5185\u5bb9\u4e3b\u8981\u5305\u62ec##content_title##\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01<\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b\u5728 Java \u4e2d\u7684\u7528\u4f8b\u5305\u62ec\u6570\u636e\u5904\u7406\uff08\u4f7f\u7528\u6d41\u8fdb\u884c\u9ad8\u6548\u7684\u6570\u636e\u64cd\u4f5c\uff09\u3001\u5e76\u884c\u7f16\u7a0b\uff08\u4f7f\u7528\u5e76\u884c\u6d41\u52a0\u901f\u8ba1\u7b97\uff09\u548c\u51fd\u6570\u7ec4\u5408\uff08\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u521b\u5efa\u53ef\u8bfb\u7684\u4ee3\u7801\uff09\u3002\u793a\u4f8b\u5305\u62ec\u5c06\u5b57\u7b26\u4e32\u5217\u8868\u8f6c\u6362\u4e3a\u5927\u5199\u5217\u8868\u3001\u8ba1\u7b97\u6574\u6570\u6570\u7ec4\u7684\u5e76\u884c\u6c42\u548c\u4ee5\u53ca\u7ec4\u5408\u51fd\u6570\u4ee5\u68c0\u67e5\u5b57\u7b26\u4e32\u7684\u5076\u6570\u957f\u5ea6\u3002\u5728\u5b9e\u9645\u6848\u4f8b\u5206\u6790\u4e2d\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b\u7528\u4e8e\u5206\u6790\u4f20\u611f\u5668\u6570\u636e\uff0c\u4f8b\u5982\u4ece\u5305\u542b\u4e0d\u540c\u7c7b\u578b\u4f20\u611f\u5668\u6570\u636e\u7684\u5217\u8868\u4e2d\u8ba1\u7b97\u7279\u5b9a\u7c7b\u578b\u4f20\u611f\u5668\u7684\u5e73\u5747\u503c\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729926996671c97541616c.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7528\u4f8b\u548c\u793a\u4f8b<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u5f0f\uff0c\u5b83\u5f3a\u8c03\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u548c\u7eaf\u51fd\u6570\u3002\u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u548c\u6d41\u6765\u5b9e\u73b0\u51fd\u6570\u5f0f\u7f16\u7a0b\u98ce\u683c\u3002<\/p>\n<p><strong>\u7528\u4f8b<\/strong><\/p>\n<p>FP \u5728\u4ee5\u4e0b\u573a\u666f\u4e2d\u7279\u522b\u6709\u7528\uff1a<\/p>\n<ul>\n<li><strong>\u6570\u636e\u5904\u7406\uff1a<\/strong> \u6d41\u64cd\u4f5c\u5141\u8bb8\u5bf9\u5927\u578b\u6570\u636e\u96c6\u8fdb\u884c\u7b80\u6d01\u9ad8\u6548\u7684\u5904\u7406\u3002<\/li>\n<li><strong>\u5e76\u884c\u7f16\u7a0b\uff1a<\/strong> \u5e76\u884c\u6d41\u53ef\u4ee5\u5229\u7528\u591a\u6838\u5904\u7406\u5668\u6765\u52a0\u901f\u8ba1\u7b97\u3002<\/li>\n<li><strong>\u51fd\u6570\u7ec4\u5408\uff1a<\/strong> Lambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u8f7b\u677e\u7ec4\u5408\uff0c\u521b\u5efa\u590d\u6742\u4f46\u53ef\u8bfb\u7684\u4ee3\u7801\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b<\/strong><\/p>\n<p><strong>\u6570\u636e\u5904\u7406\uff1a<\/strong><\/p>\n<pre>List&lt;String&gt; names = List.of(\"Alice\", \"Bob\", \"Charlie\");\nList&lt;String&gt; upperCaseNames = names.stream()\n    .map(String::toUpperCase)\n    .toList();\nSystem.out.println(upperCaseNames); \/\/ [ALICE, BOB, CHARLIE]<\/pre>\n<p><strong>\u5e76\u884c\u7f16\u7a0b\uff1a<\/strong><\/p>\n<pre>int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};\nlong sum = Arrays.stream(numbers)\n    .parallel()\n    .sum();\nSystem.out.println(sum); \/\/ 55<\/pre>\n<p><strong>\u51fd\u6570\u7ec4\u5408\uff1a<\/strong><\/p>\n<pre>Function&lt;String, Integer&gt; lengthFunction = String::length;\nFunction&lt;Integer, Boolean&gt; isEvenFunction = x -&gt; x % 2 == 0;\n\nFunction&lt;String, Boolean&gt; isEvenLengthFunction = lengthFunction.andThen(isEvenFunction);\n\nList&lt;String&gt; words = List.of(\"apple\", \"banana\", \"cherry\");\nList&lt;Boolean&gt; isEvenLength = words.stream()\n    .map(isEvenLengthFunction)\n    .toList();\nSystem.out.println(isEvenLength); \/\/ [true, true, false]<\/pre>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p><strong>\u5206\u6790\u4f20\u611f\u5668\u6570\u636e\uff1a<\/strong><\/p>\n<pre>List&lt;SensorData&gt; data = ... \/\/ \u8fd9\u662f\u4e00\u4e2a\u5927\u578b\u4f20\u611f\u5668\u6570\u636e\u5217\u8868\n\n\/\/ \u4f7f\u7528\u6d41\u548c\u51fd\u6570\u5f0f\u64cd\u4f5c\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u6790\nMap&lt;String, Double&gt; averageValues = data.stream()\n    .filter(d -&gt; d.getSensorType().equals(\"Temperature\"))\n    .mapToDouble(SensorData::getValue)\n    .average()\n    .boxed()\n    .collect(Collectors.toMap(SensorType::getName, Function.identity()));\n\nSystem.out.println(averageValues); \/\/ {Temperature=25.3}<\/pre>\n<p>\u5728\u8be5\u6848\u4f8b\u4e2d\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b\u6280\u672f\u7528\u4e8e\u8fc7\u6ee4\u3001\u6620\u5c04\u548c\u805a\u5408\u4f20\u611f\u5668\u6570\u636e\uff0c\u4ee5\u8ba1\u7b97\u7279\u5b9a\u7c7b\u578b\u7684\u4f20\u611f\u5668\u7684\u5e73\u5747\u503c\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300aJava \u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7528\u4f8b\u548c\u793a\u4f8b\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\u4e8ejava,\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7528\u4f8b\u548c\u793a\u4f8b&#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-202640","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202640","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=202640"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202640\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}