{"id":1068,"date":"2019-09-22T17:40:34","date_gmt":"2019-09-22T09:40:34","guid":{"rendered":"http:\/\/www.rain1024.com\/?p=1068"},"modified":"2023-08-07T20:57:25","modified_gmt":"2023-08-07T12:57:25","slug":"%e3%80%8aheadfirst%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e3%80%8b%e7%ac%ac%e4%b8%80%e7%ab%a0%e7%ad%96%e7%95%a5%e6%a8%a1%e5%bc%8f-%e8%af%bb%e4%b9%a6%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"http:\/\/rain1024.com\/index.php\/2019\/09\/22\/%e3%80%8aheadfirst%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e3%80%8b%e7%ac%ac%e4%b8%80%e7%ab%a0%e7%ad%96%e7%95%a5%e6%a8%a1%e5%bc%8f-%e8%af%bb%e4%b9%a6%e7%ac%94%e8%ae%b0\/","title":{"rendered":"\u300aHeadFirst\u8bbe\u8ba1\u6a21\u5f0f\u300b\u7b2c\u4e00\u7ae0\u7b56\u7565\u6a21\u5f0f-\u8bfb\u4e66\u7b14\u8bb0"},"content":{"rendered":"

\u300aHeadFirst\u8bbe\u8ba1\u6a21\u5f0f\u300b\u7b2c\u4e00\u7ae0\u7b56\u7565\u6a21\u5f0f-\u8bfb\u4e66\u7b14\u8bb0<\/h1>\n

\u6848\u4f8b\u4ee3\u7801\u94fe\u63a5\uff1ahttps:\/\/github.com\/rainweb521\/My-tutorial\/tree\/master\/Design_patterns<\/h3>\n

1. \u524d\u8a00<\/h2>\n

\n \u5de5\u4f5c\u4ee5\u540e\uff0c\u4ee3\u7801\u4e0d\u5355\u662f\u5199\u5b8c\u5c31\u53ef\u4ee5\u7684\uff0c\u590d\u7528\uff0c\u7ef4\u62a4\u4e5f\u662f\u5f88\u91cd\u8981\u7684\uff0c\u4ee5\u524d\u81ea\u5df1\u5199\u4ee3\u7801\u90fd\u662f\u4ee5\u529f\u80fd\u4e3a\u76ee\u7684\uff0c\u4e0d\u8003\u8651\u5176\u4ed6\u7684\u53ea\u5728\u4e00\u4e2a\u7c7b\u91cc\u5168\u90e8\u5199\u5b8c\u5c31\u884c\uff0c\u4f46\u8fd9\u6837\u4ee5\u540e\u4f1a\u66b4\u9732\u51fa\u66f4\u591a\u7684\u95ee\u9898\uff0c\u4e0e\u5176\u4e71\u5199\uff0c\u4e0d\u5982\u4e0d\u5199\uff0c\u591a\u7559\u4e00\u4e9b\u65f6\u95f4\u53bb\u6784\u601d\u6574\u4e2a\u6d41\u7a0b\uff0c\u800c\u4e0d\u662f\u8bf4\u5e72\u5c31\u5e72\u3002<\/p>\n

\u8bbe\u8ba1\u6a21\u5f0f\u662f\u5f88\u65e9\u4e4b\u524d\u5c31\u63a5\u89e6\u5230\u7684\u6982\u5ff5\uff0c\u4f46\u51fa\u4e8e\u7528\u4e0d\u5230\u5c31\u4e0d\u5b66\u7684\u89c2\u5ff5\uff0c\u4e00\u76f4\u90fd\u6ca1\u6709\u53bb\u8ba4\u771f\u7684\u5b66\u4e60\uff0c\u8fd9\u6b21\u4e0b\u5b9a\u51b3\u5fc3\u53bb\u5b66\u4e00\u904d\u8bbe\u8ba1\u6a21\u5f0f\u548c\u5f00\u53d1\u539f\u5219\uff0c\uff0c\u6253\u597d\u57fa\u7840\uff0c\u63d0\u9ad8\u601d\u7ef4\u7684\u9ad8\u5ea6\u3002\n<\/p><\/blockquote>\n

2. \u4ece\u9e2d\u5b50\u8bf4\u8d77<\/h2>\n

\u5982\u679c\u8bf4\u300a\u673a\u5668\u5b66\u4e60\u300b\u662f\u897f\u74dc\u4e66\uff0c\u90a3\u8bbe\u8ba1\u6a21\u5f0f\u7b2c\u4e00\u7ae0\u5c31\u662f\u9e2d\u5b50\u4e66\uff0c\u4ee5\u7269\u4e3a\u4f8b\u8ba9\u4eba\u7559\u4e0b\u66f4\u52a0\u6df1\u523b\u7684\u5370\u8c61\u3002<\/p>\n

\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u7fa4\u9e2d\u5b50\u7c7b\uff0c\u5b83\u4eec\u90fd\u662f\u7ee7\u627fDuck\u8fd9\u4e2a\u8d85\u7c7b\u3002<\/p>\n

Duck\nquack()\nswim()\ndisplay()\n\/\/\u9e2d\u5b50\u7684\u5176\u4ed6\u65b9\u6cd5\n<\/code><\/pre>\n
\u6240\u6709\u7684\u9e2d\u5b50\u90fd\u4f1a\u5471\u5471\u53eb(Quack)\u4e5f\u4f1a\u6e38\u6cf3(Swim),\u6240\u4ee5\u7531\u8d85\u7c7b\u8d1f\u8d23\u5904\u7406\u8fd9\u90e8\u5206\u7684\u5b9e\u73b0\u4ee3\u7801\u3002<\/strong><\/p>\n
\u56e0 \u4e3a \u6bcf \u4e00 \u79cd \u9e2d \u5b50 \u7684\u5916 \u89c2 \u90fd \u4e0d \u540c , \u6240 \u4ee5display()\u65b9\u6cd5\u662f\u62bd\u8c61\u7684\uff0c\u6bcf\u4e2a\u9e2d\u5b50\u5b50\u7c7b\u8d1f\u8d23\u5b9e\u73b0\u81ea\u5df1\u7684display\u3002<\/p>\n
\u8fd9\u6837\u4eff\u4f5b\u662f\u4e00\u5957\u5b8c\u7f8e\u7684\u7cfb\u7edf\uff0c\u5927\u5bb6\u5404\u53f8\u5176\u804c\uff0c\u5404\u505a\u5404\u7684\uff0c\u4f46\u76f8\u540c\u7684\u90e8\u5206\u7531\u8d85\u7c7b\u8d1f\u8d23\u7ba1\u7406\u3002<\/p>\n
3.\u9e2d\u5b50\u8981\u98de\u4e86<\/h2>\n
\u65b0\u7684\u9700\u6c42\u6765\u4e86\uff0c\u8fd9\u65f6\u5019\u6211\u4eec\u8981\u52a0\u5165\u9e2d\u5b50\u4f1a\u98de\u7684\u529f\u80fd\u3002\u9e2d\u5b50\u672c\u6765\u6709\u7fc5\u8180\uff0c\u6ca1\u95ee\u9898\uff0c\u5728\u8d85\u7c7b\u91cc\u52a0\u5165\u4e00\u4e2afly\u65b9\u6cd5\uff0c\u8ba9\u6240\u6709\u7684\u5b50\u7c7b\u7ee7\u627f\u5c31\u597d\u4e86\uff0c<\/p>\n
Duck\nquack()\nswim()\ndisplay()\nfly() \/\/\u65b0\u52a0\u5165\u7684\u98de\u884c\u65b9\u6cd5\n\/\/\u9e2d\u5b50\u7684\u5176\u4ed6\u65b9\u6cd5\n<\/code><\/pre>\n
\u786e\u5b9e\uff0c\u6240\u6709\u7684\u9e2d\u5b50\u90fd\u4f1a\u98de\u4e86\uff0c\u7136\u800c\u7cfb\u7edf\u91cc\u8fd8\u6709\u4e00\u4e9b\u6a61\u76ae\u9e2d\u5b50\uff0c\u5b83\u4eec\u4e5f\u4f1a\u98de\u4e86\uff0c\u8fd9\u662f\u4e0d\u7b26\u5408\u5e38\u7406\u7684\uff01\uff01\uff01<\/p>\n
\u6211\u4eec\u5ffd\u7565\u4e86\u4e00\u4ef6\u4e8b\u60c5\uff0c\u5e76\u4e0d\u662f\u6240\u6709\u5b50\u7c7b\u90fd\u4f1a\u98de\uff0c\u67d0\u4e9b\u4e0d\u4f1a\u98de\u7684\u4e5f\u7ee7\u627f\u4e86\u6b64\u65b9\u6cd5\u3002<\/p>\n
\n  \u6ce8\u610f\uff1a\u5bf9\u4ee3\u7801\u6240\u505a\u7684\u5c40\u90e8\u4fee\u6539\uff0c\u5f71\u54cd\u5c42\u9762\u53ef\u4e0d\u53ea\u662f\u5c40\u90e8\u3002<\/p>\n
  \u5f53\u6d89\u53ca\"\u7ef4\u62a4\"\u65f6\uff0c\u4e3a\u4e86\"\u590d\u7528\"\u76ee\u7684\u800c\u4f7f\u7528\u7ee7\u627f\uff0c\u7ed3\u5c40\u5e76\u4e0d\u5b8c\u7f8e\u3002\n<\/p><\/blockquote>\n
3.1 \u7b2c\u4e00\u4e2a\u89e3\u51b3\u529e\u6cd5\u2014\u5b50\u7c7b\u8986\u76d6<\/h3>\n
\u6211\u4eec\u53ef\u4ee5\u628a\u6a61\u76ae\u9e2d\u4e2d\u7684fly\u65b9\u6cd5\u8986\u76d6\u6389<\/p>\n
RubberDuck\nquack(){\/\/\u5431\u5431\u53eb}\ndisplay(){\/\/\u6a61\u76ae\u9e2d}\nfly(){\n  \/\/\u8986\u76d6\uff0c\u4ec0\u4e48\u4e5f\u4e0d\u505a\n}\n<\/code><\/pre>\n
\u8fd9\u6837\u597d\u50cf\u786e\u5b9e\u89e3\u51b3\u4e86\u6a61\u76ae\u9e2d\u7684\u95ee\u9898\uff0c\u4f46\u5982\u679c\u6211\u4eec\u4ee5\u540e\u6bcf\u6b21\u52a0\u5165\u4e0d\u4f1a\u98de\u7684\u9e2d\u5b50\uff0c\u90fd\u8981\u8fd9\u6837\u68c0\u67e5\u4e00\u904d\uff0c\u5c31\u5931\u53bb\u4e86\u590d\u7528\u7684\u610f\u4e49\u4e86\u3002<\/p>\n
3.2 \u7b2c\u4e8c\u4e2a\u89e3\u51b3\u529e\u6cd5---\u5229\u7528\u63a5\u53e3<\/h3>\n
\u6211\u4eec\u53ef\u4ee5\u628afly\u65b9\u6cd5\u4ece\u8d85\u7c7b\u4e2d\u53d6\u51fa\u6765\uff0c\u653e\u8fdb\u4e00\u4e2aFlyable\u63a5\u53e3\u4e2d\uff0c\u8fd9\u6837\u4e00\u6765\uff0c\u53ea\u6709\u4f1a\u98de\u7684\u9e2d\u5b50\u624d\u5b9e\u73b0\u6b64\u63a5\u53e3\u3002<\/strong><\/p>\n
\u662f\u4e0d\u662f\u611f\u89c9\u8fd9\u4e2a\u529e\u6cd5\u597d\u50cf\u53ef\u4ee5\uff0c\u5b8c\u5168\u4e0d\u662f\uff01\u8fd9\u4e48\u4e00\u6765\u91cd\u590d\u7684\u4ee3\u7801\u4f1a\u53d8\u591a\uff0c\u5982\u679c\u8986\u76d6\u51e0\u4e2a\u65b9\u6cd5\u5c31\u7b97\u662f\u5dee\u52b2,\u90a3\u4e48\u5bf9\u4e8e48\u4e2aDuck\u7684\u5b50\u7c7b\u90fd\u8981\u7a0d\u5fae\u4fee\u6539\u4e00\u4e0b\u98de\u884c\u7684\u884c\u4e3a,\u7b80\u76f4\u5c31\u662f\u5669\u68a6\u3002<\/p>\n
\u5982\u679c\u80fd\u6709\u4e00\u79cd\u5efa\u7acb\u8f6f\u4ef6\u7684\u65b9\u6cd5,\u597d\u8ba9\u6211\u4eec\u53ef\u4ee5\u7528\u4e00\u79cd\u5bf9\u65e2\u6709\u7684\u4ee3\u7801\u5f71\u54cd\u6700\u5c0f\u7684\u65b9\u5f0f\u6765\u4fee\u6539\u8f6f\u4ef6\u8be5\u6709\u591a\u597d\u3002\u6211\u4eec\u5c31\u53ef\u4ee5\u82b1\u8f83\u5c11\u65f6\u95f4\u91cd\u505a\u4ee3\u7801, \u800c\u591a\u8ba9\u7a0b\u5e8f\u53bb\u505a\u66f4\u9177\u7684\u4e8b\u3002<\/p>\n
4. \u91cd\u65b0\u770b\u5f85\u95ee\u9898<\/h2>\n
\u73b0\u5728\u6211\u4eec\u77e5\u9053\u4f7f\u7528\u7ee7\u627f\u5e76\u4e0d\u80fd\u5f88\u597d\u5730\u89e3\u51b3\u95ee\u9898,\u56e0\u4e3a\u9e2d\u5b50\u7684\u884c\u4e3a\u5728\u5b50\u7c7b\u91cc\u4e0d\u65ad\u5730\u6539\u53d8,\u5e76\u4e14\u8ba9\u6240\u6709\u7684\u5b50\u7c7b\u90fd\u6709\u8fd9\u4e9b\u884c\u4e3a\u662f\u4e0d\u6070\u5f53\u7684\u3002Flyable\u4e0eQuackable\u63a5\u53e3\u4e00\u5f00\u59cb\u4f3c\u4e4e\u8fd8\u633a\u4e0d\u9519,\u89e3\u51b3\u4e86\u95ee\u9898(\u53ea\u6709\u4f1a\u98de\u7684\u9e2d\u5b50\u624d\u7ee7\u627fFlyable),\u4f46\u662fJava\u63a5\u53e3\u4e0d\u5177\u6709\u5b9e\u73b0\u4ee3\u7801,\u6240\u4ee5\u7ee7\u627f\u63a5\u53e3\u65e0\u6cd5\u8fbe\u5230\u4ee3\u7801\u7684\u590d\u7528\u3002\u8fd9\u610f\u5473\u7740: \u65e0\u8bba\u4f55\u65f6\u4f60\u9700\u8981\u4fee\u6539\u67d0\u4e2a\u884c\u4e3a,\u4f60\u5fc5\u987b\u5f97\u5f80\u4e0b\u8ffd\u8e2a\u5e76\u5728\u6bcf\u4e00\u4e2a\u5b9a\u4e49\u6b64\u884c\u4e3a\u7684\u7c7b\u4e2d\u4fee\u6539\u5b83,\u4e00\u4e0d\u5c0f\u5fc3,\u53ef\u80fd\u4f1a\u9020\u6210\u65b0\u7684\u9519\u8bef!<\/p>\n
\u5e78\u8fd0\u7684\u662f,\u6709\u4e00\u4e2a\u8bbe\u8ba1\u539f\u5219,\u6070\u597d\u9002\u7528\u4e8e\u6b64\u72b6\u51b5\u3002<\/p>\n
\n  \u8bbe\u8ba1\u539f\u5219: \u627e\u51fa\u5e94\u7528\u4e2d\u53ef\u80fd\u9700\u8981\u53d8\u5316\u4e4b\u5904,\u628a\u5b83\u4eec\u72ec\u7acb\u51fa\u6765,\u4e0d\u8981\u548c\u90a3\u4e9b\u4e0d\u9700\u8981\u53d8\u5316\u7684\u4ee3\u7801\u6df7\u5728\u4e00\u8d77\u3002\n<\/p><\/blockquote>\n
\u6362\u53e5\u8bdd\u8bf4,\u5982\u679c\u6bcf\u6b21\u65b0\u7684\u9700\u6c42\u4e00\u6765,\u90fd\u4f1a\u4f7f\u67d0\u65b9\u9762\u7684\u4ee3\u7801\u53d1\u751f\u53d8\u5316,\u90a3\u4e48\u4f60\u5c31\u53ef\u4ee5\u786e\u5b9a,\u8fd9\u90e8\u5206\u7684\u4ee3\u7801\u9700\u8981\u88ab\u62bd\u51fa\u6765,\u548c\u5176\u4ed6\u7a33\u5b9a\u7684\u4ee3\u7801\u6709\u6240\u533a\u5206\u3002
\n\u4e0b\u9762\u662f\u8fd9\u4e2a\u539f\u5219\u7684\u53e6\u4e00\u79cd\u601d\u8003\u65b9\u5f0f:\u201c\u628a\u4f1a\u53d8\u5316\u7684\u90e8\u5206\u53d6\u51fa\u5e76\u5c01\u88c5\u8d77\u6765,\u4ee5\u4fbf\u4ee5\u540e\u53ef\u4ee5\u8f7b\u6613\u5730\u6539\u52a8\u6216\u6269\u5145\u6b64\u90e8\u5206,\u800c\u4e0d\u5f71\u54cd\u4e0d\u9700\u8981\u53d8\u5316\u7684\u5176\u4ed6\u90e8\u5206\u201d\u3002
\n\u8fd9\u6837\u7684\u6982\u5ff5\u5f88\u7b80\u5355,\u51e0\u4e4e\u662f\u6bcf\u4e2a\u8bbe\u8ba1\u6a21\u5f0f\u80cc\u540e\u7684\u7cbe\u795e\u6240\u5728\u3002\u6240\u6709\u7684\u6a21\u5f0f\u90fd\u63d0\u4f9b\u4e86\u4e00\u5957\u65b9\u6cd5\u8ba9\u201c\u7cfb\u7edf\u4e2d\u7684\u67d0\u90e8\u5206\u6539\u53d8\u4e0d\u4f1a\u5f71\u54cd\u5176\u4ed6\u90e8\u5206\u201d\u3002
\n\u597d,\u8be5\u662f\u628a\u9e2d\u5b50\u7684\u884c\u4e3a\u4eceDuck\u7c7b\u4e2d\u53d6\u51fa\u7684\u65f6\u5019\u4e86!<\/p>\n
5 \u91cd\u65b0\u8bbe\u8ba1\u9e2d\u5b50<\/h2>\n
\u6211\u4eec\u63d0\u53d6\u51fa\u4e24\u7ec4\u7c7b\uff0c\u4e00\u4e2a\u662ffly\uff0c\u4e00\u4e2a\u662fquack\uff0c\u6bcf\u4e00\u7ec4\u7c7b\u5b9e\u73b0\u5404\u81ea\u7684\u52a8\u4f5c\uff0c\u53ef\u4ee5\u6307\u5b9a\u7279\u5b9a\u7c7b\u578b\u7684\u98de\u884c\u884c\u4e3a\u7ed9\u9e2d\u5b50\uff0c\u8ba9\u5b83\u4eec\u52a8\u6001\u7684\u53bb\u6539\u53d8\u5c31\u597d\u4e86\u3002<\/p>\n
\n  \u8bbe\u8ba1\u539f\u5219\uff1a\u9488\u5bf9\u63a5\u53e3\u7f16\u7a0b\uff0c\u800c\u4e0d\u662f\u9488\u5bf9\u5b9e\u73b0\u7f16\u7a0b\u3002\n<\/p><\/blockquote>\n
\u6211\u4eec\u5229\u7528\u63a5\u53e3\u4ee3\u8868\u6bcf\u4e2a\u884c\u4e3a\uff0c\u884c\u4e3a\u7684\u6bcf\u4e2a\u5b9e\u73b0\u90fd\u5c06\u5b9e\u73b0\u5176\u4e2d\u7684\u4e00\u4e2a\u63a5\u53e3\u3002<\/p>\n
\u8fd9\u6837\u7684\u505a\u6cd5\u8fe5\u5f02\u4e8e\u4ee5\u5f80,\u4ee5\u524d\u7684\u505a\u6cd5\u662f:\u884c\u4e3a\u6765\u81eaDuck\u8d85\u7c7b\u7684\u5177\u4f53\u5b9e\u73b0,\u6216\u662f\u7ee7\u627f\u67d0\u4e2a\u63a5\u53e3\u5e76\u7531\u5b50\u7c7b\u81ea\u884c\u5b9e\u73b0\u800c\u6765\u3002\u8fd9\u4e24\u79cd\u505a\u6cd5\u90fd\u662f\u4f9d\u8d56\u4e8e\u201c\u5b9e\u73b0\u201d,\u6211\u4eec\u88ab\u5b9e\u73b0\u7ed1\u5f97\u6b7b\u6b7b\u7684,\u6ca1\u529e\u6cd5\u66f4\u6539\u884c\u4e3a(\u9664\u975e\u5199\u66f4\u591a\u4ee3\u7801)\u3002\u5728\u6211\u4eec\u7684\u65b0\u8bbe\u8ba1\u4e2d,\u9e2d\u5b50\u7684\u5b50\u7c7b\u5c06\u4f7f\u7528\u63a5\u53e3(FlyBehavior\u4e0eQuackBehavior)\u6240\u8868\u793a\u7684\u884c\u4e3a,\u6240\u4ee5\u5b9e\u9645\u7684\u201c\u5b9e\u73b0\u201d\u4e0d\u4f1a\u88ab\u7ed1\u6b7b\u5728\u9e2d\u5b50\u7684\u5b50\u7c7b\u4e2d\u3002(\u6362\u53e5\u8bdd\u8bf4,\u7279\u5b9a\u7684\u5177\u4f53\u884c\u4e3a\u7f16\u5199\u5728\u5b9e\u73b0\u4e86FlyBehavior\u4e0eQuakcBehavior\u7684\u7c7b\u4e2d)\u3002<\/p>\n
\"image-20190922172247753\"<\/p>\n
\u8fd9\u6837\u7684\u8bbe\u8ba1\uff0c\u53ef\u4ee5\u8ba9\u98de\u884c\u548c\u5471\u5471\u53eb\u7684\u52a8\u4f5c\u88ab\u5176\u4ed6\u7684\u5bf9\u8c61\u590d\u7528,\u56e0\u4e3a\u8fd9\u4e9b\u884c\u4e3a\u5df2\u7ecf\u4e0e\u9e2d\u5b50\u7c7b\u65e0\u5173\u4e86\uff0c\u4e0d\u53ea\u662f\u4e3aDuck\u7c7b\u800c\u63d0\u53d6\uff0c\u73b0\u5728\u4e0eDuck\u65e0\u5173\u4e86\u3002<\/p>\n
\n  \u8fd9\u4e48\u4e00\u6765,\u6709\u4e86\u7ee7\u627f\u7684\u201c\u590d\u7528\u201d\u597d\u5904,\u5374\u6ca1\u6709\u7ee7\u627f\u6240\u5e26\u6765\u7684\u5305\u88b1\u3002\n<\/p><\/blockquote>\n
6. \u5b9e\u73b0\u9e2d\u5b50\u884c\u4e3a<\/h2>\n
\u9996\u5148,\u5728Duck\u7c7b\u4e2d\u201c\u52a0\u5165\u4e24\u4e2a\u5b9e\u4f8b\u53d8\u91cf\u201d,\u5206\u522b\u4e3a\u201cflyBehavior\u201d\u4e0e\u201cquack Behavior\u201d,\u58f0\u660e\u4e3a\u63a5\u53e3\u7c7b\u578b(\u800c\u4e0d\u662f\u5177\u4f53\u7c7b\u5b9e\u73b0\u7c7b\u578b),\u6bcf\u4e2a\u9e2d\u5b50\u5bf9\u8c61\u90fd\u4f1a\u52a8\u6001\u5730\u8bbe\u7f6e\u8fd9\u4e9b\u53d8\u91cf\u4ee5\u5728\u8fd0\u884c\u65f6\u5f15\u7528\u6b63\u786e\u7684\u884c\u4e3a\u7c7b\u578b(\u4f8b\u5982:FlyWithWings\u3001Squeak\u7b49)\u3002
\n\u6211\u4eec\u4e5f\u5fc5\u987b\u5c06Duck\u7c7b\u4e0e\u5176\u6240\u6709\u5b50\u7c7b\u4e2d\u7684fly()\u4e0equack()\u5220\u9664,\u56e0\u4e3a\u8fd9\u4e9b\u884c\u4e3a\u5df2\u7ecf\u88ab\u642c\u5230FlyBehavior\u4e0eQuackBehavior\u7c7b\u4e2d\u4e86\u3002
\n\u6211\u4eec\u7528\u4e24\u4e2a\u76f8\u4f3c\u7684\u65b9\u6cd5performFly()\u548cperformQuack()\u53d6\u4ee3Duck\u7c7b\u4e2d\u7684fly()\u4e0equack()\u3002<\/p>\n
\u8d85\u7c7b<\/p>\n
Duck\nFlyBehavior flyBehavior\nQuackBehavior quackBehavior\nperformQuack(){      quackBehavior.quack();    }\nswim()\ndisplay()\nperformFly()\n<\/code><\/pre>\n
\u67d0\u4e2a\u5b50\u7c7b<\/p>\n
public class MallardDuck extends Duck {    \npublic MallardDuck() {       \nquackBehavior = new Quack();       \nflyBehavior = new FlyWithWings();\n}    \npublic void display() {  \nSystem.out.println(\u201cI\u2019m a real Mallard duck\u201d);    \n} \n}\n<\/code><\/pre>\n
7. \u603b\u7ed3<\/h2>\n
\u5f53\u4f60\u5c06\u4e24\u4e2a\u7c7b\u7ed3\u5408\u8d77\u6765\u4f7f\u7528\uff0c\u5982\u540c\u672c\u4f8b\u4e00-\u822c\uff0c\u8fd9\u5c31\u662f\u7ec4\u5408(composition)\u3002\u8fd9\u79cd\u505a\u6cd5\u548c\u201c\u7ee7\u627f\u201d\u4e0d\u540c\u7684\u5730\u65b9\u5728\u4e8e,\u9e2d\u5b50\u7684\u884c\u4e3a\u4e0d\u662f\u7ee7\u627f\u6765\u7684\uff0c\u800c\u662f\u548c\u9002\u5f53\u7684\u884c\u4e3a\u5bf9\u8c61\u201c\u7ec4\u5408\u201d\u6765\u7684\u3002<\/p>\n
\u5982\u4f60\u6240\u89c1\uff0c\u4f7f\u7528\u7ec4\u5408\u5efa\u7acb\u7cfb\u7edf\u5177\u6709\u5f88\u5927\u7684\u5f39\u6027\uff0c\u4e0d\u4ec5\u53ef\u5c06\u7b97\u6cd5\u65cf\u5c01\u88c5\u6210\u7c7b\uff0c\u66f4\u53ef\u4ee5\u201c\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u5730\u6539\u53d8\u884c\u4e3a\u201d\uff0c\u53ea\u8981\u7ec4\u5408\u7684\u884c\u4e3a\u5bf9\u8c61\u7b26\u5408\u6b63\u786e\u7684\u63a5\u53e3\u6807\u51c6\u5373\u53ef\u3002<\/p>\n
\n  \u8bbe\u8ba1\u539f\u5219\uff1a\u591a\u7528\u7ec4\u5408\uff0c\u5c11\u7528\u7ee7\u627f\u3002\n<\/p><\/blockquote>\n
\u7b56\u7565\u6a21\u5f0f<\/h2>\n
\n  \u5b9a\u4e49\u4e86\u7b97\u6cd5\u65cf\uff0c\u5206\u522b\u5c01\u88c5\u8d77\u6765\uff0c\u8ba9\u5b83\u4eec\u4e4b\u95f4\u53ef\u4ee5\u4e92\u76f8\u66ff\u6362\uff0c\u6b64\u6a21\u5f0f\u8ba9\u7b97\u6cd5\u7684\u53d8\u5316\u72ec\u7acb\u4e8e\u4f7f\u7528\u7b97\u6cd5\u7684\u5ba2\u6237\u3002\n<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"
\u300aHeadFirst\u8bbe\u8ba1\u6a21\u5f0f\u300b\u7b2c\u4e00\u7ae0\u7b56\u7565\u6a21\u5f0f-\u8bfb\u4e66\u7b14\u8bb0 \u6848\u4f8b\u4ee3\u7801\u94fe\u63a5\uff1ahttps:\/\/github.com\/r\u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[91],"class_list":["post-1068","post","type-post","status-publish","format-standard","hentry","category-23","tag-91"],"_links":{"self":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/1068","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/comments?post=1068"}],"version-history":[{"count":1,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/1068\/revisions"}],"predecessor-version":[{"id":1378,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/1068\/revisions\/1378"}],"wp:attachment":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/media?parent=1068"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/categories?post=1068"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/tags?post=1068"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}