{"id":1093,"date":"2019-11-11T08:53:06","date_gmt":"2019-11-11T00:53:06","guid":{"rendered":"http:\/\/www.rain1024.com\/?p=1093"},"modified":"2023-08-07T20:57:24","modified_gmt":"2023-08-07T12:57:24","slug":"%e3%80%8aheadfirst%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e3%80%8b%e7%ac%ac%e5%85%ab%e7%ab%a0%e6%a8%a1%e7%89%88%e6%96%b9%e6%b3%95%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\/11\/11\/%e3%80%8aheadfirst%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e3%80%8b%e7%ac%ac%e5%85%ab%e7%ab%a0%e6%a8%a1%e7%89%88%e6%96%b9%e6%b3%95%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\u516b\u7ae0\u6a21\u7248\u65b9\u6cd5\u6a21\u5f0f-\u8bfb\u4e66\u7b14\u8bb0"},"content":{"rendered":"

\u300aHeadFirst\u8bbe\u8ba1\u6a21\u5f0f\u300b\u7b2c\u516b\u7ae0\u6a21\u7248\u65b9\u6cd5\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. \u627e\u76f8\u540c<\/h2>\n

1.1\u5728\u51b2\u6ce1\u5496\u5561\u548c\u8336\u7684\u65f6\u5019\u6709\u4ee5\u4e0b\u4e24\u79cd\u64cd\u4f5c\u6b65\u9aa4<\/h3>\n

\u5496\u5561\u51b2\u6ce1\u6cd5<\/p>\n

    \n
  1. \u628a\u6c34\u716e\u6cb8<\/li>\n
  2. \u7528\u6cb8\u6c34\u51b2\u6ce1\u5496\u5561<\/li>\n
  3. \u628a\u5496\u5561\u5012\u8fdb\u676f\u5b50<\/li>\n
  4. \u52a0\u7cd6\u548c\u725b\u5976<\/li>\n<\/ol>\n

    \u8336\u51b2\u6ce1\u6cd5<\/p>\n

      \n
    1. \u628a\u6c34\u716e\u6cb8<\/li>\n
    2. \u7528\u6cb8\u6c34\u6d78\u6ce1\u8336\u53f6<\/li>\n
    3. \u628a\u8336\u5012\u8fdb\u676f\u5b50<\/li>\n
    4. \u52a0\u67e0\u6aac<\/li>\n<\/ol>\n

      1.2 \u5b9e\u73b0\u5496\u5561\u548c\u8336\u7684\u51b2\u6ce1<\/h3>\n
      public class Coffee {\n    void prepareRecipe(){\n        boilWater();\n        brewCoffeeGrinds();\n        pourInCup();\n        addSugarAndMilk();\n\n    }\n    public void boilWater(){\n        System.out.println(\"\u628a\u6c34\u716e\u6cb8\");\n    }\n    public void brewCoffeeGrinds(){\n        System.out.println(\"\u7528\u6cb8\u6c34\u51b2\u6ce1\u5496\u5561\");\n    }\n    public void pourInCup(){\n        System.out.println(\"\u628a\u5496\u5561\u5012\u8fdb\u676f\u5b50\");\n    }\n    public void addSugarAndMilk(){\n        System.out.println(\"\u6dfb\u52a0\u7cd6\u548c\u725b\u5976\");\n    }\n}\n<\/code><\/pre>\n
      public class Tea {\n    void prepareRecipe(){\n        boilWater();\n        steepTeaBag();\n        pourInCup();\n        addLemon();\n\n    }\n    public void boilWater(){\n        System.out.println(\"\u628a\u6c34\u716e\u6cb8\");\n    }\n    public void steepTeaBag(){\n        System.out.println(\"\u7528\u6cb8\u6c34\u51b2\u6ce1\u8336\");\n    }\n    public void pourInCup(){\n        System.out.println(\"\u628a\u8336\u5012\u8fdb\u676f\u5b50\");\n    }\n    public void addLemon(){\n        System.out.println(\"\u6dfb\u52a0\u67e0\u6aac\");\n    }\n}\n\n<\/code><\/pre>\n
      2. \u62bd\u53d6\u5171\u540c\u70b9<\/h3>\n
      \n  \u6211\u4eec\u5c06\u201c\u628a\u6c34\u716e\u6cb8\u201d\uff0c\u201c\u5012\u8fdb\u676f\u5b50\u201d\u62bd\u53d6\u51fa\u6765\uff0c\u6d78\u6ce1\u548c\u51b2\u6ce1\u90fd\u5c5e\u4e8e\u6ce1\uff0c\u800c\u52a0\u67e0\u6aac\u548c\u52a0\u7cd6\uff0c\u725b\u5976\uff0c\u90fd\u662f\u6dfb\u52a0\u914d\u6599\u7684\u64cd\u4f5c\u3002\u6240\u4ee5\u6839\u636e\u8fd9\u4e9b\u6761\u4ef6\uff0c\u8fdb\u884c\u62bd\u53d6\uff0c\u62bd\u8c61\u3002\n<\/p><\/blockquote>\n
      2.1 \u7c7b\u56fe<\/h3>\n
      \"image-20191029083253035\"<\/p>\n
      2.2 \u62bd\u53d6\u4ee3\u7801<\/h3>\n
      public abstract class CaffeineBeverage {\n    final void prepareRecipe(){\n        boilWater();\n        brew();\n        addCondimennts();\n        pourInCup();\n    }\n    abstract void brew();\n    abstract void addCondimennts();\n    public void boilWater(){\n        System.out.println(\"\u628a\u6c34\u716e\u6cb8\");\n    }\n    public void pourInCup(){\n        System.out.println(\"\u5012\u8fdb\u676f\u5b50\");\n    }\n}\n<\/code><\/pre>\n
      public class Coffee extends CaffeineBeverage{\n    public void brew(){\n        System.out.println(\"\u7528\u6cb8\u6c34\u51b2\u6ce1\u5496\u5561\");\n    }\n    public void addCondimennts(){\n        System.out.println(\"\u6dfb\u52a0\u7cd6\u548c\u725b\u5976\");\n    }\n}\n<\/code><\/pre>\n
      public class Tea extends CaffeineBeverage{\n    public void brew(){\n        System.out.println(\"\u7528\u6cb8\u6c34\u51b2\u6ce1\u8336\");\n    }\n    public void addCondimennts(){\n        System.out.println(\"\u6dfb\u52a0\u67e0\u6aac\");\n    }\n}\n<\/code><\/pre>\n
      3.\u8ba4\u8bc6\u6a21\u7248\u65b9\u6cd5<\/h2>\n
      3.1\u6a21\u677f\u65b9\u6cd5\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7b97\u6cd5\u7684\u6b65\u9aa4,\u5e76\u5bb9\u8bb8\u5b50\u7c7b\u4e3a\u4e00\u4e2a\u6216\u591a\u4e2a\u6b65\u9aa4\u63d0\u4f9b\u7a81\u73b0\u3002<\/h3>\n
        \n
      1. \u9996\u5148\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u8336\u5bf9\u8c61\n
        Tea mytea=new Tea()<\/p>\n<\/li>\n
      2. \n
        \u7136\u540e\u6211\u4eec\u8c03\u7528\u8fd9\u4e2a\u6a21\u677f\u65b9\u6cd5<\/p>\n
        mytea. preparerecipe()<\/p>\n
        \u5b83\u4f1a\u4f9d\u7167\u7b97\u6cd5\u6765\u5236\u4f5c\u5496\u5561\u56e0\u996e\u6599<\/p>\n<\/li>\n
      3. \n
        \u9996\u5148,\u628a\u6c34\u716e\u6cb8:<\/p>\n
        boilwater()<\/p>\n<\/li>\n
      4. \n
        \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u9700\u8981\u6ce1\u8336\uff0c\u8fd9\u4ef6\u4e8b\u60c5\u53ea\u6709\u5b50\u7c7b\u624d\u77e5\u9053\u8981\u600e
        \n\u4e48\u505a:
        \nbrew() ;<\/p>\n<\/li>\n
      5. \n
        \u73b0\u5728\u628a\u8336\u5012\u8fdb\u676f\u5b50\u4e2d;\u6240\u6709\u7684\u996e\u6599\u505a\u6cd5\u90fd\u4e00-\u6837\uff0c\u6240\u4ee5\u8fd9\u4ef6\u4e8b\u60c5\u53d1\u751f
        \n\u5728\u8d85\u7c7b\u4e2d:
        \npour InCup() ;<\/p>\n<\/li>\n
      6. \n
        \u6700\u540e\uff0c\u6211\u4eec\u52a0\u8fdb\u8c03\u6599\uff0c\u7531\u4e8e\u8c03\u6599\u662f\u5404\u4e2a\u996e\u6599\u72ec\u6709\u7684\uff0c\u6240\u4ee5\u7531\u5b50\u7c7b\u6765
        \n\u5b9e\u73b0\u5b83:
        \naddCondiments () ;<\/p>\n<\/li>\n<\/ol>\n
        3.2 \u5b9a\u4e49\u6a21\u7248\u65b9\u6cd5\u6a21\u5f0f<\/h3>\n
        \n
        \u6a21\u7248\u65b9\u6cd5\u6a21\u5f0f\uff1a\u5728\u4e00\u4e2a\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u7b97\u6cd5\u7684\u9aa8\u67b6\uff0c\u800c\u5c06\u4e00\u4e9b\u6b65\u9aa4\u5ef6\u8fdf\u5230\u5b50\u7c7b\u4e2d\u3002\u6a21\u7248\u65b9\u6cd5\u4f7f\u5f97\u5b50\u7c7b\u53ef\u4ee5\u5728\u4e0d\u6539\u53d8\u7b97\u6cd5\u7ed3\u6784\u7684\u60c5\u51b5\u4e0b\uff0c\u91cd\u65b0\u5b9a\u4e49\u7b97\u6cd5\u4e2d\u7684\u67d0\u4e9b\u6b65\u9aa4\u3002\n<\/p><\/blockquote>\n
        \u6a21\u7248\u65b9\u6cd5\u7684\u5b9a\u4e49<\/h4>\n
        \"image-20191029195131095\"<\/p>\n
        4.\u6709\u8da3\u7684\u94a9\u5b50<\/h2>\n
        \n  \u94a9\u5b50\u662f\u4e00\u79cd\u88ab\u58f0\u660e\u5728\u62bd\u8c61\u7c7b\u4e2d\u7684\u65b9\u6cd5,\u4f46\u53ea\u6709\u7a7a\u7684\u6216\u8005\u9ed8\u8ba4\u7684\u5b9e\u73b0\u3002\u94a9\u5b50\u7684\u5b58\u5728, \u53ef\u4ee5\u8ba9\u5b50\u7c7b\u6709\u80fd\u529b\u5bf9\u7b97\u6cd5\u7684\u4e0d\u540c\u70b9\u8fdb\u884c\u6302\u94a9\u3002\u8981\u4e0d\u8981\u6302\u94a9,\u7531\u5b50\u7c7b\u81ea\u884c\u51b3\u5b9a\u3002\n<\/p><\/blockquote>\n
        \u6709\u4e86\u94a9\u5b50,\u6211\u80fd\u591f\u51b3\u5b9a\u8981\u4e0d\u8981\u8986\u76d6\u65b9\u6cd5\u3002\u5982\u679c\u6211\u4e0d\u63d0\u4f9b\u81ea\u5df1\u7684\u65b9\u6cd5,\u62bd\u8c61\u7c7b\u4f1a\u63d0\u4f9b\u4e00\u4e2a\u9ed8\u8ba4\u7684\u7a81\u73b0\u3002<\/p>\n
        \u57fa\u7c7b<\/h4>\n
        public abstract class CaffeineBeverage {\n    final void prepareRecipe(){\n        boilWater();\n        brew();\n        pourInCup();\n        \/**\n         * \u6b8b\u4eec\u52a0\u4e0a\u4e86\u4e00\u4e2a\u5c0f\u7684\u6761\u4ef6\u8bed\u53e5,\u800c\u8be5\u6761\u4ef6\u662f\u5426\u6210\u7acb,\u662f\u7531\u4e00\u4e2a\n         * \u5177\u4f53\u65b9\u6cd5customerWantsCondiments()\u6c7a\u5b9a\u7684\u3002\n         * \u5982\u679c\u987e\u5ba2\u201c\u60f3\u8981\u201d\u8c03\u6599,\u6709\u8fd9\u65f6\u6211\u4eec\u624d\u8c03\u7528addCondimennts()\n         *\/\n        if (customerWantsCondiments()){\n            addCondimennts();\n        }\n    }\n    \/**\n     * \u6b8b\u4eec\u5728\u8fd9\u91cc\u5b9a\u4e49\u4e86-\u4e2a\u65b9\u6cd5, (\u901a\u5e38)\u662f\u7a7a\u7684\u7f3a\u7701\u5b9e\u73b0\u3002\n     * \u8fd9\u4e2a\u65b9\u6cd5\u4f1a\u8fd4\u56detrue,\u4e0d\u505a\u522b\u7684\u4e8b\u3002\n     * \u8fd9\u5c31\u662f\u4e00\u4e2a\u94a9\u5b50,\u5b50\u7c7b\u53ef\u4ee5\u8986\u76d6\u8fd9\u4e2a\u65b9\u6cd5,\u4f46\u4e0d\u89c1\u5f97\u4e00\u5b9a\u8981\u8fd9\u4e48\u505a\u3002\n     * @return\n     *\/\n    boolean customerWantsCondiments(){\n        return true;\n    }\n    abstract void brew();\n    abstract void addCondimennts();\n    public void boilWater(){\n        System.out.println(\"\u628a\u6c34\u716e\u6cb8\");\n    }\n    public void pourInCup(){\n        System.out.println(\"\u5012\u8fdb\u676f\u5b50\");\n    }\n}\n<\/code><\/pre>\n
        \u5b50\u7c7b\u4e2d<\/h4>\n
        public class Coffee extends CaffeineBeverage{\n\/\/    \u7528\u6237\u8f93\u5165\u7684\u503c\n    private String answer;\n    public void brew(){\n        System.out.println(\"\u7528\u6cb8\u6c34\u51b2\u6ce1\u5496\u5561\");\n    }\n    public void addCondimennts(){\n        System.out.println(\"\u6dfb\u52a0\u7cd6\u548c\u725b\u5976\");\n    }\n    \/\/\u8986\u76d6\u94a9\u5b50\uff0c\u63d0\u4f9b\u81ea\u5df1\u7684\u529f\u80fd\n    @Override\n    boolean customerWantsCondiments() {\n\/\/        \u8ba9\u7528\u6237\u6839\u636e\u4ed6\u4eec\u7684\u8f93\u5165\u6765\u5224\u65ad\u662f\u5426\u9700\u8981\u6dfb\u52a0\u914d\u6599\n        if (answer.toLowerCase().startsWith(\"y\")){\n            return true;\n        }else {\n            return false;\n        }\n    }\n}\n<\/code><\/pre>\n
        \n  \u8fd9\u4e2a\u4f8b\u5b50\u5b9e\u5728\u5f88\u9177,\u94a9\u5b50\u7adf\u7136\u80fd\u591f\u4f5c\u4e3a\u6761\u4ef6\u63a7\u5236,\u5f71\u54cd\u62bd\u8c61\u7c7b\u4e2d\u7684\u7b97\u6cd5\u6d41\u7a0b\u3002\n<\/p><\/blockquote>\n
        5.\u597d\u83b1\u575e\u539f\u5219<\/h2>\n
        \n  \u597d\u83b1\u575e\u539f\u5219\uff1a\u522b\u8c03\u7528(\u6253\u7535\u8bdd\u7ed9)\u6211\u4eec,\u6211\u4eec\u4f1a\u8c03\u7528(\u6253\u7535\u8bdd\u7ed9)\u4f60\u3002\n<\/p><\/blockquote>\n
        \u597d\u83b1\u575e\u539f\u5219\u53ef\u4ee5\u7ed9\u6211\u4eec\u4e00\u79cd\u9632\u6b62\u201c\u4f9d\u8d56\u8150\u8d25\u201d\u7684\u65b9\u6cd5\u3002<\/p>\n
        \u5f53\u9ad8\u5c42\u7ec4\u4ef6\u4f9d\u8d56\u4f4e\u5c42\u7ec4\u4ef6,\u800c\u4f4e\u5c42\u7ec4\u4ef6\u53c8\u4f9d\u8d56\u9ad8\u5c42\u7ec4\u4ef6,\u800c\u9ad8\u5c42\u7ec4\u4ef6\u53c8\u4f9d\u8d56\u8fb9\u4fa7\u7ec4\u4ef6,\u800c\u8fb9\u4fa7\u7ec4\u4ef6\u53c8\u4f9d\u8d56\u4f4e\u5c42\u7ec4\u4ef6\u65f6, \u4f9d\u8d56\u8150\u8d25\u5c31\u53d1\u751f\u4e86\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b,\u6ca1\u6709\u4eba\u53ef\u4ee5\u8f7b\u6613\u5730\u641e\u61c2\u7cfb\u7edf\u662f\u5982\u4f55\u8bbe\u8ba1\u7684\u3002
        \n\u5728\u597d\u83b1\u575e\u539f\u5219\u4e4b\u4e0b,\u6211\u4eec\u5141\u8bb8\u4f4e\u5c42\u7ec4\u4ef6\u5c06\u81ea\u5df1\u6302\u94a9\u5230\u7cfb\u7edf\u4e0a,\u4f46\u662f\u9ad8\u5c42\u7ec4\u4ef6\u4f1a\u51b3\u5b9a\u4ec0\u4e48\u65f6\u5019\u548c\u600e\u6837\u4f7f\u7528\u8fd9\u4e9b\u4f4e\u5c42\u7ec4\u4ef6\u3002\u6362\u53e5\u8bdd\u8bf4,\u9ad8\u5c42\u7ec4\u4ef6\u5bf9\u5f85\u4f4e\u5c42\u7ec4\u4ef6\u7684\u65b9\u5f0f\u662f\u201c\u522b\u8c03\u7528\u6211\u4eec,\u6211\u4eec\u4f1a\u8c03\u7528\u4f60\u201d<\/p>\n
        \u597d\u83b1\u575e\u539f\u5219\u548c\u4f9d\u8d56\u5012\u7f6e\u539f\u5219\u4e4b\u95f4\u7684\u5173\u7cfb\u5982\u4f55?<\/h4>\n
        \u7b54\u4f9d\u8d56\u5012\u7f6e\u539f\u5219\u6559\u6211\u4eec\u5c3d\u91cf\u907f\u514d\u4f7f\u7528\u5177\u4f53\u7c7b,\u800c\u591a\u4f7f\u7528\u62bd\u8c61\u800c\u597d\u83dc\u575e\u539f\u5219\u662f\u7528\u5728\u521b\u5efa\u6846\u67b6\u6216\u7ec4\u4ef6\u4e0a\u7684\u4e00\u79cd\u6280\u5de7,\u597d\u8ba9\u4f4e\u5c42\u7ec4\u4ef6\u80fd\u591f\u88ab\u6302\u94a9\u8fdb\u8ba1\u7b97\u4e2d,\u800c\u4e14\u53c8\u4e0d\u4f1a\u8ba9\u9ad8\u5c42\u7ec4\u4ef6\u4f9d\u8d56\u4f4e\u5c42\u7ec4\u4ef6\u3002\u4e24\u8005\u7684\u76ee\u6807\u90fd\u662f\u5728\u4e8e\u89e3\u8026,\u4f46\u662f\u4f9d\u8d56\u5012\u7f6e\u539f\u5219\u66f4\u52a0\u6ce8\u91cd\u5982\u4f55\u5728\u8bbe\u8ba1\u4e2d\u907f\u514d\u4f9d\u8d56\u3002
        \n\u597d\u83dc\u575e\u539f\u5219\u6559\u6211\u4eec\u4e00\u4e2a\u6280\u5de7,\u521b\u5efa\u4e2a\u6709\u5f39\u6027\u7684\u8bbe\u8ba1,\u5141\u8bb8\u4f4e\u5c42\u7ed3\u6784\u80fd\u591f\u4e92\u76f8\u64cd\u4f5c,\u800c\u53c8\u9632\u6b62\u5176\u4ed6\u7c7b\u592a\u8fc7\u4f9d\u8d56\u5b83\u4eec\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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