{"id":202806,"date":"2025-05-22T11:39:11","date_gmt":"2025-05-22T03:39:11","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202806\/"},"modified":"2025-05-22T11:39:11","modified_gmt":"2025-05-22T03:39:11","slug":"java-%e4%b8%ad%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e4%b8%8e%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e7%9a%84%e5%85%b3%e7%b3%bb","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202806\/","title":{"rendered":"Java \u4e2d\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e0e\u8bbe\u8ba1\u6a21\u5f0f\u7684\u5173\u7cfb"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java \u4e2d\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e0e\u8bbe\u8ba1\u6a21\u5f0f\u7684\u5173\u7cfb<\/h1>\n<p><span style=\"font-size: 15px\">\u6709\u5fd7\u8005\uff0c\u4e8b\u7adf\u6210\uff01\u5982\u679c\u4f60\u5728\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\uff0c\u90a3\u4e48\u672c\u6587<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJava \u4e2d\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e0e\u8bbe\u8ba1\u6a21\u5f0f\u7684\u5173\u7cfb\u300b<\/span>\uff0c\u5c31\u5f88\u9002\u5408\u4f60\uff01\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\uff0c\u82e5\u662f\u4f60\u5bf9\u672c\u6587\u611f\u5174\u8da3\uff0c\u6216\u8005\u662f\u60f3\u641e\u61c2\u5176\u4e2d\u67d0\u4e2a\u77e5\u8bc6\u70b9\uff0c\u5c31\u8bf7\u4f60\u7ee7\u7eed\u5f80\u4e0b\u770b\u5427~<\/span><\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\uff08\u4e0d\u53ef\u53d8\u6027\u3001\u7eaf\u51fd\u6570\u548c\u9ad8\u9636\u51fd\u6570\uff09\u4e0e\u8bbe\u8ba1\u6a21\u5f0f\u7684\u7279\u6027\uff08\u4ee3\u7801\u91cd\u7528\u3001\u62bd\u8c61\u548c\u53ef\u6269\u5c55\u6027\uff09\u5bc6\u5207\u76f8\u5173\uff0c\u76f8\u4e92\u8865\u5145\u3002\u5b83\u4eec\u53ef\u4ee5\u534f\u4f5c\u5b9e\u73b0\uff1a1. \u901a\u8fc7\u533f\u540d\u51fd\u6570\u7b80\u5316\u547d\u4ee4\u6a21\u5f0f\uff1b2. \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u4ea4\u6362\u548c\u7ec4\u5408\u7b56\u7565\u6a21\u5f0f\uff1b3. \u4f7f\u7528\u76d1\u542c\u5668\u63a5\u53e3\u548c lambda \u8868\u8fbe\u5f0f\u7b80\u5316\u89c2\u5bdf\u8005\u6a21\u5f0f\u7684\u5b9e\u73b0\u3002\u901a\u8fc7\u7406\u89e3\u8fd9\u79cd\u5173\u7cfb\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u589e\u5f3a\u8bbe\u8ba1\u6a21\u5f0f\u7684\u5b9e\u73b0\uff0c\u521b\u5efa\u66f4\u5065\u58ee\u3001\u66f4\u53ef\u7ef4\u62a4\u7684 Java \u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729944218671cda9a183b0.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u4e2d\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e0e\u8bbe\u8ba1\u6a21\u5f0f\u7684\u5173\u7cfb<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b (FP) \u548c\u8bbe\u8ba1\u6a21\u5f0f\u662f Java \u4e2d\u8f6f\u4ef6\u5f00\u53d1\u4e2d\u7684\u4e24\u4e2a\u91cd\u8981\u65b9\u9762\u3002\u7406\u89e3\u5b83\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb\u5bf9\u4e8e\u521b\u5efa\u5065\u58ee\u3001\u53ef\u7ef4\u62a4\u7684\u4ee3\u7801\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<p><strong>\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027<\/strong><\/p>\n<ul>\n<li><strong>\u4e0d\u53ef\u53d8\u6027\uff1a<\/strong> \u6570\u636e\u5728\u8fd0\u7b97\u8fc7\u7a0b\u4e2d\u4e0d\u4f1a\u53d1\u751f\u66f4\u6539\u3002<\/li>\n<li><strong>\u7eaf\u51fd\u6570\uff1a<\/strong> \u76f8\u540c\u8f93\u5165\u59cb\u7ec8\u4ea7\u751f\u76f8\u540c\u8f93\u51fa\uff0c\u5e76\u4e14\u4e0d\u5f71\u54cd\u5916\u90e8\u72b6\u6001\u3002<\/li>\n<li><strong>\u9ad8\u9636\u51fd\u6570\uff1a<\/strong> \u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u6216\u8fd4\u56de\u5176\u4ed6\u51fd\u6570\u3002<\/li>\n<\/ul>\n<p><strong>\u8bbe\u8ba1\u6a21\u5f0f\u7279\u6027<\/strong><\/p>\n<ul>\n<li><strong>\u4ee3\u7801\u91cd\u7528\uff1a<\/strong> \u63d0\u4f9b\u7ecf\u8fc7\u9a8c\u8bc1\u7684\u53ef\u91cd\u7528\u89e3\u51b3\u65b9\u6848\u3002<\/li>\n<li><strong>\u62bd\u8c61\uff1a<\/strong> \u9690\u85cf\u5b9e\u73b0\u7ec6\u8282\uff0c\u63d0\u4f9b\u677e\u6563\u8026\u5408\u3002<\/li>\n<li><strong>\u53ef\u6269\u5c55\u6027\uff1a<\/strong> \u6613\u4e8e\u6269\u5c55\u548c\u7ef4\u62a4\u3002<\/li>\n<\/ul>\n<p><strong>\u5173\u7cfb<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b\u548c\u8bbe\u8ba1\u6a21\u5f0f\u5bc6\u5207\u76f8\u5173\uff0c\u53ef\u4ee5\u76f8\u4e92\u8865\u5145\uff1a<\/p>\n<p><strong>1. \u547d\u4ee4\u6a21\u5f0f<\/strong><\/p>\n<p>\u547d\u4ee4\u6a21\u5f0f\u5c06\u884c\u4e3a\u5c01\u88c5\u5728\u5bf9\u8c61\u4e2d\u3002FP \u4e2d\u7684\u533f\u540d\u51fd\u6570\u53ef\u4ee5\u8f7b\u677e\u521b\u5efa\u547d\u4ee4\u5bf9\u8c61\uff0c\u4ece\u800c\u7b80\u5316\u6a21\u5f0f\u7684\u5b9e\u73b0\u3002<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>\/\/ FP \u533f\u540d\u51fd\u6570\u521b\u5efa\u547d\u4ee4\u5bf9\u8c61\nCommand cmd = (param) -&gt; System.out.println(param);\n\n\/\/ \u4f7f\u7528\u547d\u4ee4\u6a21\u5f0f\u6267\u884c\u547d\u4ee4\nInvoker invoker = new Invoker();\ninvoker.setCommand(cmd);\ninvoker.executeCommand(\"Hello world!\");<\/pre>\n<p><strong>2. \u7b56\u7565\u6a21\u5f0f<\/strong><\/p>\n<p>\u7b56\u7565\u6a21\u5f0f\u5141\u8bb8\u5ba2\u6237\u7aef\u9009\u62e9\u7b97\u6cd5\u3002FP \u63d0\u4f9blambda \u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u8f7b\u677e\u4ea4\u6362\u548c\u7ec4\u5408\u7b56\u7565\u3002<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>\/\/ FP Lambda \u8868\u8fbe\u5f0f\u521b\u5efa\u7b56\u7565\u5bf9\u8c61\nStrategy strategy = (param) -&gt; param * 2;\n\n\/\/ \u4f7f\u7528\u7b56\u7565\u6a21\u5f0f\u5e94\u7528\u7b56\u7565\nContext context = new Context();\ncontext.setStrategy(strategy);\n\nint result = context.applyStrategy(5);\nSystem.out.println(result); \/\/ \u8f93\u51fa 10<\/pre>\n<p><strong>3. \u89c2\u5bdf\u8005\u6a21\u5f0f<\/strong><\/p>\n<p>\u89c2\u5bdf\u8005\u6a21\u5f0f\u5141\u8bb8\u5bf9\u8c61\u8ba2\u9605\u5e76\u54cd\u5e94\u4e8b\u4ef6\u3002FP \u4e2d\u7684\u76d1\u542c\u5668\u63a5\u53e3\u548c lambda \u8868\u8fbe\u5f0f\u53ef\u7b80\u5316\u8ba2\u9605\u548c\u4e8b\u4ef6\u5904\u7406\u8fc7\u7a0b\u3002<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>\/\/ FP Lambda \u8868\u8fbe\u5f0f\u521b\u5efa\u89c2\u5bdf\u8005\u5bf9\u8c61\nObserver observer = (event) -&gt; System.out.println(event.getMessage());\n\n\/\/ \u4f7f\u7528\u89c2\u5bdf\u8005\u6a21\u5f0f\u6dfb\u52a0\u89c2\u5bdf\u8005\nSubject subject = new Subject();\nsubject.addObserver(observer);\n\n\/\/ \u89e6\u53d1\u4e8b\u4ef6\nsubject.notifyObservers(new Event(\"Event triggered!\"));<\/pre>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>\u51fd\u6570\u5f0f\u7f16\u7a0b\u548c\u8bbe\u8ba1\u6a21\u5f0f\u76f8\u4e92\u5b8c\u5584\uff0c\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5de5\u5177\u6765\u521b\u5efa\u53ef\u91cd\u7528\u3001\u53ef\u7ef4\u62a4\u548c\u53ef\u6269\u5c55\u7684 Java \u5e94\u7528\u7a0b\u5e8f\u3002\u901a\u8fc7\u7406\u89e3\u5b83\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u5229\u7528 FP \u7684\u7279\u6027\u6765\u589e\u5f3a\u8bbe\u8ba1\u6a21\u5f0f\u7684\u5b9e\u73b0\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u4e2d\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e0e\u8bbe\u8ba1\u6a21\u5f0f&#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-202806","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202806","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=202806"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202806\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202806"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202806"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202806"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}