{"id":281,"date":"2026-07-21T10:01:02","date_gmt":"2026-07-21T02:01:02","guid":{"rendered":"http:\/\/ssjava.xyz\/index.php\/2026\/07\/19\/java-enum-deep-dive\/"},"modified":"2026-07-19T14:54:12","modified_gmt":"2026-07-19T06:54:12","slug":"26-%e6%9e%9a%e4%b8%be%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90%ef%bc%9a%e4%bb%8e%e5%b8%b8%e9%87%8f%e7%ae%a1%e7%90%86%e5%88%b0%e7%8a%b6%e6%80%81%e6%9c%ba%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/ssjava.xyz\/index.php\/2026\/07\/21\/26-%e6%9e%9a%e4%b8%be%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90%ef%bc%9a%e4%bb%8e%e5%b8%b8%e9%87%8f%e7%ae%a1%e7%90%86%e5%88%b0%e7%8a%b6%e6%80%81%e6%9c%ba%e5%ae%9e%e6%88%98\/","title":{"rendered":"26. \u679a\u4e3e\u6df1\u5ea6\u89e3\u6790\uff1a\u4ece\u5e38\u91cf\u7ba1\u7406\u5230\u72b6\u6001\u673a\u5b9e\u6218"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u4e00\u4e2a\u573a\u666f\uff1a\u4f60\u5199\u4e86\u4e00\u4e2a\u7528\u6237\u7ba1\u7406\u7cfb\u7edf\uff0c\u7528\u6237\u6709\u4e2a\u300c\u89d2\u8272\u300d\u5b57\u6bb5\u3002\u4f60\u53ef\u80fd\u4f1a\u5199\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String role = \"admin\";  \/\/ \u7ba1\u7406\u5458\nString role2 = \"user\";  \/\/ \u666e\u901a\u7528\u6237<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u770b\u8d77\u6765\u633a\u5408\u7406\u5bf9\u5427\uff1f\u76f4\u5230\u67d0\u5929\u4f60\u53d1\u73b0\u6570\u636e\u5e93\u91cc\u51fa\u73b0\u4e86\u4e00\u4e2a<code>\"Admin\"<\/code>\uff0c\u4e00\u4e2a<code>\"ADMIN\"<\/code>\uff0c\u8fd8\u6709\u4e00\u4e2a<code>\"\u8d85\u7ea7\u7ba1\u7406\u5458\"<\/code>\u2026\u2026\u8840\u538b\u4e0a\u6765\u4e86\u6ca1\u6709\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b57\u7b26\u4e32\u7684\u7075\u6d3b\u6027\u65e2\u662f\u4f18\u70b9\u4e5f\u662f\u707e\u96be\u2014\u2014\u8c01\u90fd\u53ef\u4ee5\u62fc\u4e00\u4e2a\u5b57\u7b26\u4e32\u4f20\u8fdb\u6765\uff0c\u7f16\u8bd1\u9636\u6bb5\u6839\u672c\u68c0\u67e5\u4e0d\u51fa\u6765\u3002\u8fd9\u5c31\u8981\u8bf7\u51fa\u6211\u4eec\u4eca\u5929\u7684\u4e3b\u89d2\uff1a<strong>\u679a\u4e3e\uff08Enum\uff09<\/strong>\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u679a\u4e3e\u662f\u4ec0\u4e48\uff1f\u4e00\u53e5\u8bdd<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u679a\u4e3e\u5c31\u662f\u4e00\u7ec4\u56fa\u5b9a\u5e38\u91cf\u7684\u7c7b\u578b\u5b89\u5168\u96c6\u5408\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b80\u5355\u8bf4\uff1a\u4f60\u544a\u8bc9 Java\u300c\u7cfb\u7edf\u91cc\u53ea\u6709\u8fd9\u4e09\u79cd\u89d2\u8272\uff1a\u7ba1\u7406\u5458\u3001\u666e\u901a\u7528\u6237\u3001\u6e38\u5ba2\u300d\u2014\u2014Java \u8bb0\u4f4f\u4e86\uff0c\u7136\u540e\u8c01\u60f3\u4f20\u4e2a<code>\"ADMIN\"<\/code>\u6216\u8005<code>\"\u8d85\u7ea7\u7ba1\u7406\u5458\"<\/code>\u8fdb\u6765\uff0c\u7f16\u8bd1\u5668\u76f4\u63a5\u62a5\u9519\uff0c\u95e8\u90fd\u6ca1\u6709\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u57fa\u672c\u8bed\u6cd5\uff1aenum \u5173\u952e\u5b57<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java 5 \u5f15\u5165\u4e86<code>enum<\/code>\u5173\u952e\u5b57\uff0c\u5b9a\u4e49\u4e00\u4e2a\u679a\u4e3e\u5c31\u50cf\u5b9a\u4e49\u4e00\u4e2a\u7c7b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum Role {\n    ADMIN,\n    USER,\n    GUEST\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c31\u8fd9\u4e48\u7b80\u5355\u3002\u4e09\u4e2a\u679a\u4e3e\u5e38\u91cf\u4e4b\u95f4\u7528\u9017\u53f7\u5206\u9694\uff0c\u672b\u5c3e\u53ef\u4ee5\u52a0\u5206\u53f7\uff08\u4e5f\u53ef\u4ee5\u4e0d\u52a0\uff0c\u4f46\u5982\u679c\u679a\u4e3e\u4f53\u91cc\u8fd8\u6709\u522b\u7684\u4e1c\u897f\u5c31\u5fc5\u987b\u52a0\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7528\u7684\u65f6\u5019\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Role myRole = Role.ADMIN;\n\n\/\/ \u5bf9\u6bd4\u4e00\u4e0b\u5b57\u7b26\u4e32\u7248\u672c\u7684\u95ee\u9898\n\/\/ String role = \"admin\";\n\/\/ \u4e0b\u9762\u7684\u4ee3\u7801\u7f16\u8bd1\u671f\u6839\u672c\u4e0d\u77e5\u9053\u4f60\u5728\u73a9\u706b\n\/\/ if (\"ADMIN\".equals(role)) \/\/ \u72d7\u5934\u4fdd\u547d\n\n\/\/ \u679a\u4e3e\u7248\u672c\u2014\u2014\u5b89\u5168\nif (myRole == Role.ADMIN) {\n    System.out.println(\"\u6b22\u8fce\u7ba1\u7406\u5458\");\n}<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><code>==<\/code> \u53ef\u4ee5\u76f4\u63a5\u6bd4\u8f83\u679a\u4e3e\u5e38\u91cf\uff0c\u56e0\u4e3a\u679a\u4e3e\u5e38\u91cf\u662f\u5355\u4f8b\u7684\uff0c\u6bcf\u4e2a\u5e38\u91cf\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\u3002\u4e0d\u7528\u5199<code>.equals()<\/code>\uff0c\u770b\u7740\u5c31\u6e05\u723d\u3002<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u679a\u4e3e\u6bd4\u4f60\u60f3\u7684\u5f3a\u5927\u591a\u4e86<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u591a\u65b0\u624b\u4ee5\u4e3a\u679a\u4e3e\u5c31\u662f\u4e2a\u9ad8\u7ea7\u5e38\u91cf\u5217\u8868\u3002\u9519\u4e86\u3002\u679a\u4e3e\u5176\u5b9e\u662f<strong>\u7c7b<\/strong>\u2014\u2014\u5bf9\uff0c\u4f60\u6ca1\u770b\u9519\uff0c<code>enum<\/code>\u5728 Java \u91cc\u9762\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u7c7b\uff0c\u7ee7\u627f\u81ea <code>java.lang.Enum<\/code>\u3002\u8fd9\u5c31\u610f\u5473\u7740\u679a\u4e3e\u53ef\u4ee5\u6709\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b57\u6bb5\uff08\u6210\u5458\u53d8\u91cf\uff09<\/li>\n\n\n\n<li>\u6784\u9020\u65b9\u6cd5<\/li>\n\n\n\n<li>\u65b9\u6cd5<\/li>\n\n\n\n<li>\u751a\u81f3\u53ef\u4ee5\u6709\u81ea\u5df1\u7684\u62bd\u8c61\u65b9\u6cd5<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u6765\uff0c\u7ed9<code>Role<\/code>\u52a0\u70b9\u6599\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum Role {\n    ADMIN(\"\u7ba1\u7406\u5458\", 1),\n    USER(\"\u666e\u901a\u7528\u6237\", 2),\n    GUEST(\"\u6e38\u5ba2\", 3);\n\n    private final String displayName;\n    private final int level;\n\n    \/\/ \u6784\u9020\u65b9\u6cd5\u5fc5\u987b\u662f private \u7684\n    Role(String displayName, int level) {\n        this.displayName = displayName;\n        this.level = level;\n    }\n\n    public String getDisplayName() {\n        return displayName;\n    }\n\n    public int getLevel() {\n        return level;\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6bcf\u4e2a\u679a\u4e3e\u5e38\u91cf\u540e\u9762\u62ec\u53f7\u91cc\u7684\u503c\u5c31\u662f\u4f20\u7ed9\u6784\u9020\u65b9\u6cd5\u7684\u53c2\u6570\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Role admin = Role.ADMIN;\nSystem.out.println(admin.getDisplayName());  \/\/ \u7ba1\u7406\u5458\nSystem.out.println(admin.getLevel());         \/\/ 1<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u5c31\u6709\u610f\u601d\u4e86\u2014\u2014\u679a\u4e3e\u4e0d\u518d\u662f\u5e72\u5df4\u5df4\u7684\u5e38\u91cf\u540d\u5b57\uff0c\u5b83\u8ddf\u5177\u4f53\u7684\u6570\u636e\u7ed1\u5b9a\u4e86\u3002\u4f60\u5b9a\u4e49\u597d\u4ec0\u4e48\u89d2\u8272\u4ec0\u4e48\u6743\u9650\u7b49\u7ea7\uff0c\u4ee3\u7801\u91cc\u968f\u4fbf\u53d6\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u679a\u4e3e\u5e38\u7528\u7684\u5185\u7f6e\u65b9\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u6709\u679a\u4e3e\u90fd\u7ee7\u627f\u4e86 <code>java.lang.Enum<\/code>\uff0c\u6240\u4ee5\u6709\u51e0\u4e2a\u73b0\u6210\u7684\u65b9\u6cd5\u53ef\u4ee5\u76f4\u63a5\u7528\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u65b9\u6cd5<\/th><th>\u4f5c\u7528<\/th><\/tr><\/thead><tbody><tr><td><code>name()<\/code><\/td><td>\u8fd4\u56de\u679a\u4e3e\u5e38\u91cf\u7684\u540d\u5b57\uff08\u5b57\u7b26\u4e32\uff09\uff0c\u6bd4\u5982 <code>\"ADMIN\"<\/code><\/td><\/tr><tr><td><code>ordinal()<\/code><\/td><td>\u8fd4\u56de\u679a\u4e3e\u5e38\u91cf\u7684\u5e8f\u53f7\uff0c\u4ece 0 \u5f00\u59cb<\/td><\/tr><tr><td><code>values()<\/code><\/td><td>\u8fd4\u56de\u8be5\u679a\u4e3e\u7c7b\u578b\u7684\u6240\u6709\u5e38\u91cf\u6570\u7ec4<\/td><\/tr><tr><td><code>valueOf(String)<\/code><\/td><td>\u6839\u636e\u540d\u5b57\u5b57\u7b26\u4e32\u8fd4\u56de\u5bf9\u5e94\u7684\u679a\u4e3e\u5e38\u91cf<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ values() \u904d\u5386\u6240\u6709\u679a\u4e3e\nfor (Role role : Role.values()) {\n    System.out.println(role.name() + \" -&gt; \" + role.getDisplayName());\n}\n\n\/\/ valueOf() \u5b57\u7b26\u4e32\u8f6c\u679a\u4e3e\nRole role = Role.valueOf(\"ADMIN\");\nSystem.out.println(role.getDisplayName());  \/\/ \u7ba1\u7406\u5458\n\n\/\/ \u5c0f\u5fc3\uff01valueOf(\"admin\") \u4f1a\u629b IllegalArgumentException\n\/\/ \u56e0\u4e3a\u5927\u5c0f\u5199\u5fc5\u987b\u7cbe\u786e\u5339\u914d<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u679a\u4e3e\u4e2d\u7684\u62bd\u8c61\u65b9\u6cd5\u4e0e\u884c\u4e3a\u5b9a\u5236<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u62db\u662f\u6211\u6700\u559c\u6b22\u679a\u4e3e\u7684\u5730\u65b9\u2014\u2014\u6bcf\u4e2a\u679a\u4e3e\u5e38\u91cf\u53ef\u4ee5\u6709\u81ea\u5df1\u7684\u884c\u4e3a\u3002\u770b\u4e2a\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum Operation {\n    ADD {\n        @Override\n        public int apply(int x, int y) {\n            return x + y;\n        }\n    },\n    SUBTRACT {\n        @Override\n        public int apply(int x, int y) {\n            return x - y;\n        }\n    },\n    MULTIPLY {\n        @Override\n        public int apply(int x, int y) {\n            return x * y;\n        }\n    };\n\n    \/\/ \u62bd\u8c61\u65b9\u6cd5\uff0c\u6bcf\u4e2a\u679a\u4e3e\u5e38\u91cf\u5fc5\u987b\u5b9e\u73b0\n    public abstract int apply(int x, int y);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7528\u8d77\u6765\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int result = Operation.ADD.apply(3, 5);       \/\/ 8\nint result2 = Operation.MULTIPLY.apply(3, 5); \/\/ 15<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u662f\u4e0d\u662f\u6709\u70b9\u50cf\u533f\u540d\u5185\u90e8\u7c7b\uff1f\u6bcf\u4e2a\u679a\u4e3e\u5e38\u91cf\u5728\u82b1\u62ec\u53f7\u91cc\u91cd\u5199\u4e86\u62bd\u8c61\u65b9\u6cd5\u3002\u4ee5\u524d\u4f60\u5199\u8ba1\u7b97\u5668\u903b\u8f91\u53ef\u80fd\u662f<code>if...else if...else<\/code>\u4e00\u957f\u4e32\uff0c\u73b0\u5728\u76f4\u63a5<code>Operation.ADD.apply()<\/code>\uff0c\u65e2\u5b89\u5168\u53c8\u4f18\u96c5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u679a\u4e3e\u5b9e\u6218\uff1a\u72b6\u6001\u673a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u679a\u4e3e\u6700\u7ecf\u5178\u7684\u5e94\u7528\u573a\u666f\u5c31\u662f<strong>\u72b6\u6001\u673a<\/strong>\u3002\u62ff\u8ba2\u5355\u4e3e\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum OrderStatus {\n    PENDING_PAYMENT {\n        @Override\n        public OrderStatus next() {\n            return PAID;\n        }\n    },\n    PAID {\n        @Override\n        public OrderStatus next() {\n            return SHIPPED;\n        }\n    },\n    SHIPPED {\n        @Override\n        public OrderStatus next() {\n            return DELIVERED;\n        }\n    },\n    DELIVERED {\n        @Override\n        public OrderStatus next() {\n            return COMPLETED;\n        }\n    },\n    COMPLETED {\n        @Override\n        public OrderStatus next() {\n            return COMPLETED; \/\/ \u7ec8\u6001\n        }\n    };\n\n    public abstract OrderStatus next();\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6574\u4e2a\u8ba2\u5355\u6d41\u8f6c\u903b\u8f91\u76f4\u63a5\u5b9a\u4e49\u5728\u679a\u4e3e\u91cc\u9762\u4e86\uff0c\u4e0d\u7528\u5230\u5904\u5199<code>switch-case<\/code>\uff0c\u4e5f\u4e0d\u7528\u62c5\u5fc3\u67d0\u4e2a\u72b6\u6001\u8f6c\u79fb\u5fd8\u4e86\u5904\u7406\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>OrderStatus current = OrderStatus.PENDING_PAYMENT;\nOrderStatus next = current.next();  \/\/ PAID\nnext = next.next();                   \/\/ SHIPPED<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f\u4e0d\u662f\u6bd4\u4f60\u5728 Service \u91cc\u5199\u4e00\u5927\u5768 if-else \u6e05\u723d\u591a\u4e86\uff1f<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001switch \u4e0e\u679a\u4e3e\u7684\u9ec4\u91d1\u642d\u6863<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java 7 \u4e4b\u524d switch \u53ea\u80fd\u652f\u6301 int\u3001char \u8fd9\u4e9b\uff0c\u4f46\u679a\u4e3e\u4ece Java 5 \u5f00\u59cb\u5c31\u5b8c\u7f8e\u652f\u6301\u4e86\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public void handleRole(Role role) {\n    switch (role) {  \/\/ \u4e0d\u7528\u5199 Role.ADMIN\uff0c\u7f16\u8bd1\u5668\u53ef\u4ee5\u63a8\u65ad\n        case ADMIN:\n            System.out.println(\"\u5168\u6743\u9650\");\n            break;\n        case USER:\n            System.out.println(\"\u6709\u9650\u6743\u9650\");\n            break;\n        case GUEST:\n            System.out.println(\"\u53ea\u8bfb\u6743\u9650\");\n            break;\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\u4e24\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>case<\/code> \u540e\u9762\u76f4\u63a5\u5199\u5e38\u91cf\u540d\uff0c\u4e0d\u7528\u5199 <code>Role.ADMIN<\/code><\/li>\n\n\n\n<li>\u5982\u679c\u589e\u52a0\u4e86\u65b0\u7684\u679a\u4e3e\u5e38\u91cf\u4f46\u6ca1\u6709\u52a0 <code>case<\/code>\uff0c\u7f16\u8bd1\u5668\u4e0d\u4f1a\u62a5\u9519\uff08\u8fd9\u662f switch \u7684\u8001\u6bdb\u75c5\uff0c\u53ea\u80fd\u9760\u4f60\u81ea\u5df1\u7559\u4e2a\u5fc3\u773c\u52a0 <code>default<\/code> \u515c\u5e95\uff09<\/li>\n<\/ul>\n\n\n\n<h2 id=\"\u516b\u3001switch-\u8868\u8fbe\u5f0f\u4e0e\u679a\u4e3e\u7684\u73b0\u4ee3\u73a9\u6cd5\" class=\"wp-block-heading\">\u516b\u3001switch \u8868\u8fbe\u5f0f\u4e0e\u679a\u4e3e\u7684\u73b0\u4ee3\u73a9\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece Java 14 \u5f00\u59cb\uff0cswitch \u6709\u4e86<strong>\u8868\u8fbe\u5f0f<\/strong>\u7684\u5199\u6cd5\uff08\u9884\u89c8\u7279\u6027\u5728 Java 12 \u5c31\u5f15\u5165\u4e86\uff09\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String permission = switch (role) {\n    case ADMIN -&gt; \"ALL\";\n    case USER -&gt; \"READ_WRITE\";\n    case GUEST -&gt; \"READ_ONLY\";\n};\n\n\/\/ \u4e5f\u53ef\u4ee5\u7528 yield \u8fd4\u56de\u503c\nString permission2 = switch (role) {\n    case ADMIN:\n        yield \"ALL\";\n    case USER:\n        yield \"READ_WRITE\";\n    case GUEST:\n        yield \"READ_ONLY\";\n};<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7bad\u5934\u8bed\u6cd5\u914d\u5408\u679a\u4e3e\uff0c\u7b80\u76f4\u5f3a\u8feb\u75c7\u798f\u97f3\u3002\u800c\u4e14\u7f16\u8bd1\u5668\u4f1a\u68c0\u67e5\u4f60\u7684 switch \u8868\u8fbe\u5f0f\u662f\u5426\u8986\u76d6\u4e86\u6240\u6709\u7684\u679a\u4e3e\u5e38\u91cf\u2014\u2014\u6f0f\u4e00\u4e2a\u5c31\u7f16\u8bd1\u62a5\u9519\uff01<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u8fd9\u4e00\u70b9\u5f88\u91cd\u8981\uff1a<strong>switch\u8868\u8fbe\u5f0f\u8981\u6c42\u7a77\u5c3d\u6240\u6709case\u3002<\/strong>\u4e00\u65e6\u4f60\u7ed9\u679a\u4e3e\u65b0\u589e\u4e86\u4e00\u4e2a\u5e38\u91cf\u4f46\u6ca1\u52a0case\uff0c\u7f16\u8bd1\u5668\u76f4\u63a5\u6482\u6311\u5b50\u3002<br>\u8fd9\u662fswitch\u8bed\u53e5\u6ca1\u6709\u7684\u5b89\u5168\u4fdd\u969c\u3002<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e5d\u3001\u679a\u4e3e\u7684\u5730\u96f7\u4e0e\u5c0f\u6280\u5de7<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">1. \u679a\u4e3e\u4e0d\u80fd\u7ee7\u627f\u522b\u7684\u7c7b\uff0c\u4f46\u53ef\u4ee5\u5b9e\u73b0\u63a5\u53e3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\u6240\u6709\u679a\u4e3e\u90fd\u9690\u5f0f\u7ee7\u627f\u4e86 <code>java.lang.Enum<\/code>\uff0cJava \u4e0d\u5141\u8bb8\u4e00\u4e2a\u7c7b\u540c\u65f6\u7ee7\u627f\u4e24\u4e2a\u7236\u7c7b\u3002\u4f46\u679a\u4e3e\u53ef\u4ee5\u5b9e\u73b0\u63a5\u53e3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public interface Describable {\n    String getDescription();\n}\n\npublic enum Role implements Describable {\n    ADMIN(\"\u8d85\u7ea7\u7ba1\u7406\u5458\"),\n    USER(\"\u666e\u901a\u7528\u6237\"),\n    GUEST(\"\u6e38\u5ba2\");\n\n    private final String description;\n\n    Role(String description) {\n        this.description = description;\n    }\n\n    @Override\n    public String getDescription() {\n        return description;\n    }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u7528\u679a\u4e3e\u6d88\u9664\u9b54\u6cd5\u503c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u591a\u9879\u76ee\u91cc\u5145\u65a5\u7740\u8fd9\u79cd\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if (status == 1) { ... }  \/\/ \u8c01\u77e5\u9053 1 \u662f\u5565\uff1f<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6539\u6210\u679a\u4e3e\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum Status {\n    ACTIVE(1),\n    INACTIVE(0),\n    DELETED(-1);\n\n    private final int code;\n\n    Status(int code) {\n        this.code = code;\n    }\n\n    public int getCode() {\n        return code;\n    }\n\n    public static Status fromCode(int code) {\n        for (Status s : values()) {\n            if (s.code == code) return s;\n        }\n        throw new IllegalArgumentException(\"\u672a\u77e5\u72b6\u6001\u7801: \" + code);\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6570\u636e\u5e93\u91cc\u5b58\u7684 1\/0\/-1 \u8bfb\u5230 Java \u91cc\u5c31\u53d8\u6210 <code>Status.ACTIVE<\/code>\uff0c\u53ef\u8bfb\u6027\u548c\u5b89\u5168\u6027\u90fd\u62c9\u6ee1\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u679a\u4e3e\u7684 instance \u5b57\u6bb5\u548c\u6784\u9020\u65b9\u6cd5\u5fc5\u987b\u662f private<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f\u5f3a\u5236\u89c4\u5b9a\u3002\u679a\u4e3e\u7684\u6784\u9020\u65b9\u6cd5\u53ea\u80fd\u662f <code>private<\/code> \u7684\uff08\u4e0d\u5199\u9ed8\u8ba4\u4e5f\u662f private\uff09\uff0c\u56e0\u4e3a\u679a\u4e3e\u5e38\u91cf\u662f\u5728\u7c7b\u52a0\u8f7d\u65f6\u521b\u5efa\u7684\uff0c\u4e0d\u5141\u8bb8\u5916\u90e8 new \u4e00\u4e2a\u679a\u4e3e\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. ordinal() \u548c name() \u614e\u7528<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>ordinal()<\/code> \u8fd4\u56de\u679a\u4e3e\u5e38\u91cf\u7684\u58f0\u660e\u987a\u5e8f\uff0c\u4f46\u5982\u679c\u4f60\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u8c03\u6574\u4e86\u679a\u4e3e\u7684\u987a\u5e8f\uff08\u6bd4\u5982\u628a <code>GUEST<\/code> \u4ece\u7d22\u5f15 2 \u79fb\u5230\u4e86 1\uff09\uff0c\u90a3\u4e4b\u524d\u5e8f\u5217\u5316\u7684\u6570\u636e\u5c31\u5168\u5d29\u4e86\u3002\u6301\u4e45\u5316\u679a\u4e3e\u5230\u6570\u636e\u5e93\u65f6\uff0c\u6700\u597d\u5b58\u81ea\u5b9a\u4e49\u7684 code \u6216 name\uff0c\u800c\u4e0d\u662f ordinal\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5341\u3001\u7ed3\u8bed<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u679a\u4e3e\u662f\u4e2a\u770b\u8d77\u6765\u7b80\u5355\u3001\u5b9e\u9645\u4e0a\u80fd\u73a9\u51fa\u82b1\u7684\u4e1c\u897f\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u57fa\u7840\u7528\u6cd5\uff1a\u7c7b\u578b\u5b89\u5168\u7684\u5e38\u91cf\u96c6\u5408\uff0c\u66ff\u6362 <code>public static final int<\/code><\/li>\n\n\n\n<li>\u8fdb\u9636\u7528\u6cd5\uff1a\u5e26\u5b57\u6bb5\u548c\u6784\u9020\u65b9\u6cd5\uff0c\u751a\u81f3\u6bcf\u4e2a\u5e38\u91cf\u6709\u81ea\u5df1\u7684\u884c\u4e3a<\/li>\n\n\n\n<li>\u5b9e\u6218\u7528\u6cd5\uff1a\u72b6\u6001\u673a\u3001\u6d88\u9664\u9b54\u6cd5\u503c\u3001switch \u8868\u8fbe\u5f0f\u679a\u4e3e\u7a77\u5c3d<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u591a\u4eba\u4e00\u5f00\u59cb\u89c9\u5f97\u679a\u4e3e\u5c31\u662f\u300c\u82b1\u54e8\u7684\u5e38\u91cf\u5b9a\u4e49\u300d\uff0c\u76f4\u5230\u88ab\u5b57\u7b26\u4e32 Bug \u641e\u5d29\u8fc7\u4e00\u6b21\u4e4b\u540e\uff0c\u624d\u660e\u767d\u679a\u4e3e\u7684\u9999\u3002\u4f60\u80fd\u65e9\u7528\u5c31\u65e9\u7528\uff0c\u5c24\u5176\u662f\u90a3\u4e9b\u53ea\u53d6\u6709\u9650\u503c\u7684\u573a\u666f\u2014\u2014\u72b6\u6001\u3001\u89d2\u8272\u3001\u7c7b\u578b\u3001\u914d\u7f6e\u9879\uff0c\u80fd\u7528\u679a\u4e3e\u7684\u5730\u65b9\u7edd\u4e0d\u5199\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u4e00\u7bc7\u6211\u4eec\u804a<strong>\u5305\u88c5\u7c7b\uff08Wrapper Class\uff09<\/strong>\u2014\u2014Java \u7684 int \u4e3a\u4ec0\u4e48\u6709\u5bf9\u8c61\u7248\u672c\uff1f\u81ea\u52a8\u88c5\u7bb1\u62c6\u7bb1\u662f\u600e\u4e48\u5b9e\u73b0\u7684\uff1fInteger \u7f13\u5b58\u6c60\u53c8\u662f\u4ec0\u4e48\u5751\uff1f\u8fd9\u4e9b\u5185\u5bb9\u4e0d\u7b97\u591a\u4f46\u5751\u4e0d\u5c11\uff0c\u503c\u5f97\u5355\u5f00\u4e00\u7bc7\u597d\u597d\u8bb2\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5047\u8bbe\u4e00\u4e2a\u573a\u666f\uff1a\u4f60\u5199\u4e86\u4e00\u4e2a\u7528\u6237\u7ba1\u7406\u7cfb\u7edf\uff0c\u7528\u6237\u6709\u4e2a\u300c\u89d2\u8272\u300d\u5b57\u6bb5\u3002\u4f60\u53ef\u80fd\u4f1a\u5199\uff1a \u8fd9\u770b\u8d77\u6765\u633a\u5408\u7406\u5bf9\u5427\uff1f\u76f4\u5230\u67d0\u5929\u4f60\u53d1\u73b0\u6570 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35,72,9],"tags":[61,89,91,90,86],"class_list":["post-281","post","type-post","status-publish","format-standard","hentry","category-03-","category-08-enum-wrapper","category-java","tag-java","tag-javase","tag-91","tag-90","tag-86"],"_links":{"self":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/281","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=281"}],"version-history":[{"count":2,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/281\/revisions"}],"predecessor-version":[{"id":299,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/281\/revisions\/299"}],"wp:attachment":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=281"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=281"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=281"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}