{"id":202572,"date":"2025-05-22T09:46:58","date_gmt":"2025-05-22T01:46:58","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202572\/"},"modified":"2025-05-22T09:46:58","modified_gmt":"2025-05-22T01:46:58","slug":"java-%e4%b8%ad%e7%9a%84%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e5%8f%8a%e5%85%b6%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202572\/","title":{"rendered":"Java \u4e2d\u7684\u8bbe\u8ba1\u6a21\u5f0f\u53ca\u5176\u793a\u4f8b"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java \u4e2d\u7684\u8bbe\u8ba1\u6a21\u5f0f\u53ca\u5176\u793a\u4f8b<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span>    <\/p>\n<p>\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u52aa\u529b\u5b66\u4e60\u5427\uff01\u672c\u6587<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJava \u4e2d\u7684\u8bbe\u8ba1\u6a21\u5f0f\u53ca\u5176\u793a\u4f8b\u300b<\/span>\u4e3b\u8981\u8bb2\u89e3\u4e86<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6211\u4f1a\u5728\u4e2d\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u7684\u7cfb\u5217\u6587\u7ae0\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u5e76\u79ef\u6781\u7559\u8a00\u5efa\u8bae\u3002\u4e0b\u9762\u5c31\u5148\u4e00\u8d77\u6765\u770b\u4e00\u4e0b\u672c\u7bc7\u6b63\u6587\u5185\u5bb9\u5427\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729919003671c781b418ae.jpg\" class=\"aligncenter\"><\/p>\n<h2> java \u4e2d\u7684\u8bbe\u8ba1\u6a21\u5f0f\u662f\u4ec0\u4e48\uff1f <\/h2>\n<p>\u8bbe\u8ba1\u6a21\u5f0f\u662f\u8f6f\u4ef6\u8bbe\u8ba1\u4e2d\u5e38\u89c1\u95ee\u9898\u7684\u53ef\u91cd\u7528\u89e3\u51b3\u65b9\u6848\u3002\u5b83\u4eec\u4ee3\u8868\u4e86\u53ef\u5e94\u7528\u4e8e\u8f6f\u4ef6\u5f00\u53d1\u4e2d\u5404\u79cd\u60c5\u51b5\u7684\u6700\u4f73\u5b9e\u8df5\uff0c\u7279\u522b\u662f\u50cf java \u8fd9\u6837\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u3002<\/p>\n<h3> \u8bbe\u8ba1\u6a21\u5f0f\u7684\u7c7b\u578b <\/h3>\n<ul>\n<li> <strong>\u521b\u5efa\u6a21\u5f0f\uff1a<\/strong> \u5904\u7406\u5bf9\u8c61\u521b\u5efa\u673a\u5236\u3002<\/li>\n<li> <strong>\u7ed3\u6784\u6a21\u5f0f\uff1a<\/strong> \u5173\u6ce8\u7c7b\u548c\u5bf9\u8c61\u7684\u7ec4\u6210\u65b9\u5f0f\u3002<\/li>\n<li> <strong>\u884c\u4e3a\u6a21\u5f0f\uff1a<\/strong> \u4e13\u6ce8\u4e8e\u5bf9\u8c61\u4e4b\u95f4\u7684\u901a\u4fe1\u3002<\/li>\n<\/ul>\n<h3> \u8bbe\u8ba1\u6a21\u5f0f\u7684\u7528\u9014 <\/h3>\n<ul>\n<li> \u4fc3\u8fdb\u4ee3\u7801\u53ef\u91cd\u7528\u6027\u3002<\/li>\n<li> \u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/li>\n<li> \u4fc3\u8fdb\u5f00\u53d1\u8005\u4e4b\u95f4\u7684\u6c9f\u901a\u3002<\/li>\n<\/ul>\n<h3> \u8bbe\u8ba1\u6a21\u5f0f\u793a\u4f8b <\/h3>\n<h4> 1. \u5355\u4f8b\u6a21\u5f0f <\/h4>\n<pre>    public class singleton {\n        private static singleton instance;\n\n        private singleton() {}\n\n        public static singleton getinstance() {\n            if (instance == null) {\n                instance = new singleton();\n            }\n            return instance;\n        }\n    }\n<\/pre>\n<h5> \u4f18\u70b9\uff1a <\/h5>\n<ul>\n<li> \u5bf9\u5355\u4e2a\u5b9e\u4f8b\u7684\u53d7\u63a7\u8bbf\u95ee\u3002<\/li>\n<li> \u901a\u8fc7\u9632\u6b62\u591a\u4e2a\u5b9e\u4f8b\u6765\u8282\u7701\u5185\u5b58\u3002<\/li>\n<\/ul>\n<h5> \u7f3a\u70b9\uff1a <\/h5>\n<ul>\n<li> \u7531\u4e8e\u5168\u5c40\u72b6\u6001\u800c\u96be\u4ee5\u6d4b\u8bd5\u3002<\/li>\n<li> \u53ef\u80fd\u5bfc\u81f4\u7d27\u5bc6\u8026\u5408\u3002<\/li>\n<\/ul>\n<h4> 2. \u89c2\u5bdf\u8005\u6a21\u5f0f <\/h4>\n<pre>    import java.util.arraylist;\n    import java.util.list;\n\n    interface observer {\n        void update(string message);\n    }\n\n    class subject {\n        private list observers = new arraylist&lt;&gt;();\n\n        public void addobserver(observer observer) {\n            observers.add(observer);\n        }\n\n        public void notifyobservers(string message) {\n            for (observer observer : observers) {\n                observer.update(message);\n            }\n        }\n    }\n<\/pre>\n<h5> \u4f18\u70b9\uff1a <\/h5>\n<ul>\n<li> \u4fc3\u8fdb\u4e3b\u4f53\u548c\u89c2\u5bdf\u8005\u4e4b\u95f4\u7684\u677e\u8026\u5408\u3002<\/li>\n<li> \u53ef\u8f7b\u677e\u6269\u5c55\u65b0\u89c2\u5bdf\u8005\u3002<\/li>\n<\/ul>\n<h5> \u7f3a\u70b9\uff1a <\/h5>\n<ul>\n<li> \u5982\u679c\u6709\u5f88\u591a\u89c2\u5bdf\u8005\uff0c\u6027\u80fd\u4f1a\u5f88\u5dee\u3002<\/li>\n<li> \u7531\u4e8e\u95f4\u63a5\u901a\u4fe1\u800c\u96be\u4ee5\u8c03\u8bd5\u3002<\/li>\n<\/ul>\n<h4> 3. \u5efa\u9020\u8005\u6a21\u5f0f <\/h4>\n<pre>    class product {\n        private string part1;\n        private string part2;\n\n        public void setpart1(string part1) { this.part1 = part1; }\n        public void setpart2(string part2) { this.part2 = part2; }\n    }\n\n    class builder {\n        private product product = new product();\n\n        public builder buildpart1(string part1) {\n            product.setpart1(part1);\n            return this;\n        }\n\n        public builder buildpart2(string part2) {\n            product.setpart2(part2);\n            return this;\n        }\n\n        public product build() {\n            return product;\n        }\n    }\n<\/pre>\n<h5> \u4f18\u70b9\uff1a <\/h5>\n<ul>\n<li> \u7b80\u5316\u590d\u6742\u5bf9\u8c61\u7684\u521b\u5efa\u3002<\/li>\n<li> \u4f7f\u4ee3\u7801\u66f4\u5177\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/li>\n<\/ul>\n<h5> \u7f3a\u70b9\uff1a <\/h5>\n<ul>\n<li> \u901a\u8fc7\u591a\u4e2a\u6784\u5efa\u5668\u7c7b\u589e\u52a0\u590d\u6742\u6027\u3002<\/li>\n<li> \u5bf9\u4e8e\u7b80\u5355\u7684\u7269\u4f53\u6765\u8bf4\u53ef\u80fd\u6709\u70b9\u8fc7\u5206\u4e86\u3002<\/li>\n<\/ul>\n<h4> 4.\u5de5\u5382\u6a21\u5f0f <\/h4>\n<pre>    interface Shape {\n       void draw();\n    }\n\n    class Circle implements Shape {\n       public void draw() { System.out.println(\"Drawing a Circle\"); }\n    }\n\n    class Rectangle implements Shape {\n       public void draw() { System.out.println(\"Drawing a Rectangle\"); }\n    }\n\n    class ShapeFactory {\n       public Shape getShape(String shapeType) {\n          if (shapeType == null) return null;\n          if (shapeType.equalsIgnoreCase(\"CIRCLE\")) return new Circle();\n          if (shapeType.equalsIgnoreCase(\"RECTANGLE\")) return new Rectangle();\n          return null;\n       }\n    }\n<\/pre>\n<h5> \u4f18\u70b9\uff1a <\/h5>\n<ul>\n<li> \u5c01\u88c5\u5bf9\u8c61\u521b\u5efa\u903b\u8f91\u3002<\/li>\n<li> \u65e0\u9700\u4fee\u6539\u73b0\u6709\u4ee3\u7801\u5373\u53ef\u8f7b\u677e\u6269\u5c55\u65b0\u5f62\u72b6\u3002<\/li>\n<\/ul>\n<h5> \u7f3a\u70b9\uff1a <\/h5>\n<ul>\n<li> \u6dfb\u52a0\u989d\u5916\u7684\u7c7b\uff0c\u8fd9\u4f1a\u589e\u52a0\u590d\u6742\u6027\u3002<\/li>\n<li> \u5982\u679c\u4f7f\u7528\u4e0d\u5f53\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5de5\u5382\u7c7b\u6fc0\u589e\u3002<\/li>\n<\/ul>\n<h3> \u56db\u4eba\u5e2e (gof) <\/h3>\n<p>\u201c\u56db\u4eba\u5e2e\u201d\u6307\u7684\u662f\u6709\u5f71\u54cd\u529b\u7684\u4e66\u300a\u8bbe\u8ba1\u6a21\u5f0f\uff1a\u53ef\u91cd\u7528\u9762\u5411\u5bf9\u8c61\u8f6f\u4ef6\u7684\u5143\u7d20\u300b\u7684\u4f5c\u8005\u3002\u4f5c\u8005\u2014\u2014erich gamma\u3001richard helm\u3001ralph johnson \u548c john vlissides\u2014\u2014\u4ecb\u7ecd\u4e86 23 \u79cd\u7ecf\u5178\u8bbe\u8ba1\u6a21\u5f0f\uff0c\u8fd9\u4e9b\u6a21\u5f0f\u5df2\u6210\u4e3a\u8f6f\u4ef6\u5de5\u7a0b\u7684\u57fa\u7840\u3002<\/p>\n<h2> \u7ed3\u8bba <\/h2>\n<p>\u8bbe\u8ba1\u6a21\u5f0f\u662f java \u7f16\u7a0b\u4e2d\u5fc5\u4e0d\u53ef\u5c11\u7684\u5de5\u5177\uff0c\u53ef\u5e2e\u52a9\u5f00\u53d1\u4eba\u5458\u521b\u5efa\u5065\u58ee\u4e14\u53ef\u7ef4\u62a4\u7684\u7cfb\u7edf\u3002\u4e86\u89e3\u5b83\u4eec\u7684\u7528\u9014\u3001\u4f18\u70b9\u548c\u7f3a\u70b9\u5bf9\u4e8e\u6709\u6548\u7684\u8f6f\u4ef6\u8bbe\u8ba1\u81f3\u5173\u91cd\u8981\u3002\u56db\u4eba\u5e2e\u7684\u8d21\u732e\u4e3a\u6709\u6548\u5e94\u7528\u8fd9\u4e9b\u6a21\u5f0f\u63d0\u4f9b\u4e86\u575a\u5b9e\u7684\u57fa\u7840\u3002<\/p>\n<p>\u672c\u7bc7\u5173\u4e8e\u300aJava \u4e2d\u7684\u8bbe\u8ba1\u6a21\u5f0f\u53ca\u5176\u793a\u4f8b\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<p>      \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb\u5220\u9664<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u4e2d\u7684\u8bbe\u8ba1\u6a21\u5f0f\u53ca\u5176\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-202572","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202572","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=202572"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202572\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202572"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202572"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202572"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}