{"id":1289,"date":"2026-04-22T23:00:12","date_gmt":"2026-04-22T15:00:12","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=1289"},"modified":"2026-04-22T23:00:14","modified_gmt":"2026-04-22T15:00:14","slug":"%e3%80%90java%e3%80%91%e4%b8%80%e6%96%87%e5%90%83%e9%80%8f-java-%e6%9e%9a%e4%b8%be%ef%bc%9a%e4%bb%8e%e5%9f%ba%e7%a1%80%e5%88%b0%e5%ae%9e%e6%88%98%e7%9a%84%e5%ae%8c%e6%95%b4%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=1289","title":{"rendered":"\u3010Java\u3011\u4e00\u6587\u5403\u900f Java \u679a\u4e3e\uff1a\u4ece\u57fa\u7840\u5230\u5b9e\u6218\u7684\u5b8c\u6574\u6307\u5357"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u4eca\u5929\u60f3\u548c\u5927\u5bb6\u6df1\u5165\u804a\u804a Java \u4e2d\u7684\u679a\u4e3e\uff08enum\uff09\u3002\u4f5c\u4e3a Java 1.5 \u7248\u672c\u5f15\u5165\u7684\u91cd\u8981\u7279\u6027\uff0c\u679a\u4e3e\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u6709\u7740\u5e7f\u6cdb\u7684\u5e94\u7528\uff0c\u4f46\u5f88\u591a\u5f00\u53d1\u8005\u53ef\u80fd\u53ea\u505c\u7559\u5728\u8868\u9762\u4f7f\u7528\uff0c\u6ca1\u6709\u5145\u5206\u53d1\u6325\u5176\u5f3a\u5927\u529f\u80fd\u3002\u8fd9\u7bc7\u6587\u7ae0\u5c31\u5e26\u5927\u5bb6\u4ece\u6982\u5ff5\u5230\u5b9e\u6218\uff0c\u5168\u9762\u638c\u63e1 Java \u679a\u4e3e\u7684\u6838\u5fc3\u77e5\u8bc6\u70b9\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u679a\u4e3e\u7684\u6838\u5fc3\u6982\u5ff5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\u6211\u4eec\u8981\u660e\u786e\uff1a<strong>\u679a\u4e3e\uff08enum\uff09\u662f\u4e00\u79cd\u7279\u6b8a\u7c7b\u578b\u7684\u7c7b\uff0c\u9690\u5f0f\u7ee7\u627f\u81ea java.lang.Enum<\/strong>\uff0c\u5b83\u4e3b\u8981\u7528\u4e8e\u8868\u793a\u4e00\u7ec4\u56fa\u5b9a\u7684\u5e38\u91cf\u96c6\u5408\u3002\u6bd4\u5982\u6e38\u620f\u4e2d\u7684\u73a9\u5bb6\u7c7b\u578b\u3001\u8ba2\u5355\u72b6\u6001\u3001\u6027\u522b\u9009\u9879\u7b49\u573a\u666f\uff0c\u90fd\u975e\u5e38\u9002\u5408\u7528\u679a\u4e3e\u6765\u5b9a\u4e49\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u5982\u4f55\u5b9a\u4e49\u679a\u4e3e\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9a\u4e49\u679a\u4e3e\u7684\u8bed\u6cd5\u975e\u5e38\u7b80\u6d01\uff0c\u4e0b\u9762\u4ee5\u73a9\u5bb6\u7c7b\u578b\u4e3a\u4f8b\uff0c\u521b\u5efa\u4e00\u4e2a\u679a\u4e3e\u7c7b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u5b9a\u4e49\u679a\u4e3ePlayerType\npublic enum PlayerType {\n    TANK, \/\/ \u5766\u514b\n    DAMAGE_DEALER, \/\/ \u8f93\u51fa\n    HEALER, \/\/ \u6cbb\u7597\n    SUPPORTER \/\/ \u8f85\u52a9\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\u5c31\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b\u56db\u79cd\u73a9\u5bb6\u7c7b\u578b\u7684\u679a\u4e3e\uff0c\u6bcf\u4e2a\u679a\u4e3e\u5e38\u91cf\u90fd\u662f PlayerType \u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001Java \u7f16\u8bd1\u5668\u5bf9\u679a\u4e3e\u7684 &#8220;\u6697\u7bb1\u64cd\u4f5c&#8221;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u591a\u4eba\u4e0d\u77e5\u9053\uff0c\u5f53\u6211\u4eec\u5b9a\u4e49\u4e00\u4e2a\u679a\u4e3e\u65f6\uff0cJava \u7f16\u8bd1\u5668\u4f1a\u5728\u80cc\u540e\u505a\u4e00\u7cfb\u5217\u9690\u5f0f\u5de5\u4f5c\uff0c\u8ba9\u679a\u4e3e\u80fd\u591f\u76f4\u63a5\u4f7f\u7528\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9690\u5f0f\u7ee7\u627f<\/strong>\uff1a\u679a\u4e3e\u7c7b\u81ea\u52a8\u7ee7\u627f java.lang.Enum\uff0c\u56e0\u6b64\u4e0d\u80fd\u518d\u7ee7\u627f\u5176\u4ed6\u7c7b\uff08\u4f46\u53ef\u4ee5\u5b9e\u73b0\u63a5\u53e3\uff09<\/li>\n\n\n\n<li><strong>\u79c1\u6709\u6784\u9020\u65b9\u6cd5<\/strong>\uff1a\u7f16\u8bd1\u5668\u751f\u6210\u79c1\u6709\u6784\u9020\u65b9\u6cd5\uff0c\u786e\u4fdd\u5916\u90e8\u65e0\u6cd5\u901a\u8fc7 new \u521b\u5efa\u679a\u4e3e\u5b9e\u4f8b<\/li>\n\n\n\n<li><strong>\u9759\u6001\u53d8\u91cf\u4e0e\u6570\u7ec4<\/strong>\uff1a\u4e3a\u6bcf\u4e2a\u679a\u4e3e\u5e38\u91cf\u521b\u5efa\u9759\u6001\u5b9e\u4f8b\uff0c\u5e76\u751f\u6210\u4e00\u4e2a\u6570\u7ec4\u5b58\u50a8\u6240\u6709\u679a\u4e3e<\/li>\n\n\n\n<li><strong>\u9759\u6001\u521d\u59cb\u5316\u5757<\/strong>\uff1a\u901a\u8fc7\u9759\u6001\u5757\u521d\u59cb\u5316\u4e0a\u8ff0\u9759\u6001\u53d8\u91cf\u548c\u6570\u7ec4<\/li>\n\n\n\n<li><strong>\u63d0\u4f9b\u9759\u6001\u65b9\u6cd5<\/strong>\uff1a\u81ea\u52a8\u751f\u6210 values ()\uff08\u8fd4\u56de\u6240\u6709\u679a\u4e3e\u5e38\u91cf\u6570\u7ec4\uff09\u548c valueOf (String name)\uff08\u6839\u636e\u540d\u79f0\u83b7\u53d6\u679a\u4e3e\uff09\u65b9\u6cd5<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u53cd\u7f16\u8bd1\u9a8c\u8bc1\u8fd9\u4e00\u70b9\uff0c\u6bd4\u5982\u4e0a\u9762\u7684 PlayerType \u679a\u4e3e\uff0c\u7f16\u8bd1\u5668\u4f1a\u9690\u5f0f\u751f\u6210\u7c7b\u4f3c\u4e0b\u9762\u7684\u4ee3\u7801\uff08\u7b80\u5316\u7248\uff09\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public final class PlayerType extends Enum {\n    \/\/ \u679a\u4e3e\u5e38\u91cf\u5bf9\u5e94\u7684\u9759\u6001\u5b9e\u4f8b\n    public static final PlayerType TANK = new PlayerType();\n    public static final PlayerType DAMAGE_DEALER = new PlayerType();\n    public static final PlayerType HEALER = new PlayerType();\n    public static final PlayerType SUPPORTER = new PlayerType();\n    \n    \/\/ \u5b58\u50a8\u6240\u6709\u679a\u4e3e\u5e38\u91cf\u7684\u6570\u7ec4\n    private static final PlayerType&#91;] VALUES = new PlayerType&#91;]{TANK, DAMAGE_DEALER, HEALER, SUPPORTER};\n    \n    \/\/ \u79c1\u6709\u6784\u9020\u65b9\u6cd5\n    private PlayerType() {\n        super(\"TANK\", 0); \/\/ \u8c03\u7528Enum\u7236\u7c7b\u6784\u9020\u65b9\u6cd5\uff0c\u4f20\u5165\u540d\u79f0\u548c\u5e8f\u53f7\n    }\n    \n    \/\/ \u9759\u6001\u65b9\u6cd5\n    public static PlayerType&#91;] values() {\n        return VALUES.clone();\n    }\n    \n    public static PlayerType valueOf(String name) {\n        return Enum.valueOf(PlayerType.class, name);\n    }\n}\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u679a\u4e3e\u7684\u4f5c\u7528\u57df\u4e0e\u8bbf\u95ee\u63a7\u5236<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u679a\u4e3e\u7684\u4f5c\u7528\u57df\u5206\u4e3a\u4e24\u79cd\u573a\u666f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9876\u7ea7\u679a\u4e3e<\/strong>\uff1a\u5355\u72ec\u5b9a\u4e49\u5728.java \u6587\u4ef6\u4e2d\uff0c\u4f5c\u7528\u57df\u4e3a\u6574\u4e2a\u5305<\/li>\n\n\n\n<li><strong>\u5185\u90e8\u679a\u4e3e<\/strong>\uff1a\u5b9a\u4e49\u5728\u5176\u4ed6\u7c7b\u5185\u90e8\uff0c\u4f5c\u7528\u57df\u9650\u5b9a\u4e8e\u5916\u90e8\u7c7b\uff0c\u7c7b\u4f3c\u5185\u90e8\u7c7b<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u793a\u4f8b\uff1a\u5185\u90e8\u679a\u4e3e\u7684\u4f7f\u7528<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class GameSystem {\n    \/\/ \u5185\u90e8\u679a\u4e3e\uff0c\u4ec5\u5728GameSystem\u7c7b\u4e2d\u53ef\u8bbf\u95ee\n    public enum Difficulty {\n        EASY, NORMAL, HARD, HELL\n    }\n    \n    \/\/ \u4f7f\u7528\u5185\u90e8\u679a\u4e3e\n    public void startGame(Difficulty difficulty) {\n        switch (difficulty) {\n            case EASY:\n                System.out.println(\"\u7b80\u5355\u6a21\u5f0f\u542f\u52a8\uff0c\u654c\u4eba\u653b\u51fb\u529b\u964d\u4f4e30%\");\n                break;\n            case HELL:\n                System.out.println(\"\u5730\u72f1\u6a21\u5f0f\u542f\u52a8\uff0c\u5c0f\u5fc3\u88ab\u79d2\u6740\uff01\");\n                break;\n            default:\n                System.out.println(\"\u666e\u901a\u6a21\u5f0f\u542f\u52a8\");\n        }\n    }\n    \n    public static void main(String&#91;] args) {\n        \/\/ \u8bbf\u95ee\u5185\u90e8\u679a\u4e3e\u9700\u8981\u901a\u8fc7\u5916\u90e8\u7c7b\n        GameSystem game = new GameSystem();\n        game.startGame(GameSystem.Difficulty.HELL);\n    }\n}\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u679a\u4e3e\u7684\u6bd4\u8f83\uff1a\u4e3a\u4ec0\u4e48\u63a8\u8350\u7528 == \u800c\u4e0d\u662f equals ()\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u679a\u4e3e\u5e38\u91cf\u662f\u5355\u4f8b\u7684\uff0c\u56e0\u6b64\u6bd4\u8f83\u4e24\u4e2a\u679a\u4e3e\u5b9e\u4f8b\u65f6\uff0c<strong>\u5f3a\u70c8\u63a8\u8350\u4f7f\u7528 == \u8fd0\u7b97\u7b26<\/strong>\uff0c\u800c\u975e equals () \u65b9\u6cd5\uff0c\u539f\u56e0\u6709\u4e24\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7a7a\u6307\u9488\u5b89\u5168<\/strong>\uff1a\u5f53\u4e24\u4e2a\u5bf9\u8c61\u90fd\u4e3a null \u65f6\uff0c== \u4e0d\u4f1a\u629b\u51fa NullPointerException\uff0c\u800c equals () \u4f1a<\/li>\n\n\n\n<li><strong>\u7f16\u8bd1\u65f6\u7c7b\u578b\u68c0\u67e5<\/strong>\uff1a\u5982\u679c == \u4e24\u4fa7\u7c7b\u578b\u4e0d\u5339\u914d\uff0c\u7f16\u8bd1\u5668\u4f1a\u76f4\u63a5\u62a5\u9519\uff1bequals () \u5219\u4e0d\u4f1a\uff0c\u53ef\u80fd\u5bfc\u81f4\u903b\u8f91\u9519\u8bef<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u793a\u4f8b\u5bf9\u6bd4\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>PlayerType type1 = PlayerType.TANK;\nPlayerType type2 = null;\nPlayerType type3 = PlayerType.DAMAGE_DEALER;\n\n\/\/ \u6b63\u786e\u7528\u6cd5\uff1a==\u6bd4\u8f83\nif (type2 == null) { \/\/ \u4e0d\u4f1a\u62a5\u9519\n    System.out.println(\"type2\u4e3anull\");\n}\n\n\/\/ \u9519\u8bef\u7528\u6cd5\uff1aequals()\u6bd4\u8f83null\nif (type2.equals(type1)) { \/\/ \u629b\u51faNullPointerException\n    System.out.println(\"\u76f8\u7b49\");\n}\n\n\/\/ \u7f16\u8bd1\u9519\u8bef\uff1a\u7c7b\u578b\u4e0d\u5339\u914d\nif (type1 == \"TANK\") { \/\/ \u7f16\u8bd1\u5668\u76f4\u63a5\u63d0\u793a\u9519\u8bef\n}\n\n\/\/ \u65e0\u7f16\u8bd1\u9519\u8bef\uff0c\u4f46\u903b\u8f91\u9519\u8bef\nif (type1.equals(\"TANK\")) { \/\/ \u8fd0\u884c\u7ed3\u679c\u4e3afalse\uff0c\u4e0d\u6613\u6392\u67e5\n}\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u679a\u4e3e\u4e0e switch \u8bed\u53e5\u7684\u5b8c\u7f8e\u7ed3\u5408<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u679a\u4e3e\u662f switch \u8bed\u53e5\u7684\u7406\u60f3\u642d\u6863\uff0c\u4f7f\u7528\u65f6\u65e0\u9700\u50cf\u5b57\u7b26\u4e32\u90a3\u6837\u62c5\u5fc3\u7a7a\u6307\u9488\uff0c\u4e5f\u65e0\u9700\u50cf\u6574\u6570\u90a3\u6837\u62c5\u5fc3\u53d6\u503c\u8303\u56f4\u9519\u8bef\uff0c\u4ee3\u7801\u53ef\u8bfb\u6027\u66f4\u5f3a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u793a\u4f8b\uff1a\u679a\u4e3e\u5728 switch \u4e2d\u7684\u5e94\u7528<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class PlayerFactory {\n    public static Player createPlayer(PlayerType type) {\n        switch (type) {\n            case TANK:\n                return new TankPlayer(\"\u94a2\u94c1\u5b88\u536b\", 10000, 500);\n            case DAMAGE_DEALER:\n                return new DamageDealer(\"\u6697\u5f71\u523a\u5ba2\", 3000, 2000);\n            case HEALER:\n                return new Healer(\"\u5723\u5149\u7267\u5e08\", 4000, 800);\n            case SUPPORTER:\n                return new Supporter(\"\u79d8\u6cd5\u8d24\u8005\", 3500, 600);\n            default:\n                throw new IllegalArgumentException(\"\u672a\u77e5\u7684\u73a9\u5bb6\u7c7b\u578b\uff1a\" + type);\n        }\n    }\n    \n    public static void main(String&#91;] args) {\n        Player player = createPlayer(PlayerType.HEALER);\n        System.out.println(\"\u521b\u5efa\u73a9\u5bb6\uff1a\" + player.getName());\n        player.castSkill();\n    }\n}\n\n\/\/ \u73a9\u5bb6\u57fa\u7c7b\nabstract class Player {\n    private String name;\n    private int hp;\n    private int attack;\n    \n    \/\/ \u6784\u9020\u65b9\u6cd5\u3001getter\/setter\u7701\u7565\n    \n    public abstract void castSkill();\n}\n\n\/\/ \u5177\u4f53\u73a9\u5bb6\u7c7b\nclass Healer extends Player {\n    public Healer(String name, int hp, int attack) {\n        super(name, hp, attack);\n    }\n    \n    @Override\n    public void castSkill() {\n        System.out.println(getName() + \"\u91ca\u653e\u795e\u5723\u6cbb\u6108\uff0c\u4e3a\u961f\u53cb\u6062\u590d\u751f\u547d\u503c\uff01\");\n    }\n}\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u5e26\u53c2\u6570\u7684\u679a\u4e3e\uff1a\u8ba9\u679a\u4e3e\u66f4\u5f3a\u5927<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9ed8\u8ba4\u7684\u679a\u4e3e\u5e38\u91cf\u53ea\u80fd\u8868\u793a\u540d\u79f0\uff0c\u5b9e\u9645\u5f00\u53d1\u4e2d\u6211\u4eec\u5e38\u5e38\u9700\u8981\u4e3a\u679a\u4e3e\u6dfb\u52a0\u66f4\u591a\u4fe1\u606f\uff08\u5982\u63cf\u8ff0\u3001\u7f16\u7801\u7b49\uff09\uff0c\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u81ea\u5b9a\u4e49\u679a\u4e3e\u7684\u5b57\u6bb5\u548c\u5e26\u53c2\u6784\u9020\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u793a\u4f8b\uff1a\u5e26\u53c2\u6570\u7684\u679a\u4e3e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum OrderStatus {\n    \/\/ \u679a\u4e3e\u5e38\u91cf\uff1a\u540d\u79f0(\u7f16\u7801, \u63cf\u8ff0)\n    PENDING(1, \"\u5f85\u652f\u4ed8\"),\n    PAID(2, \"\u5df2\u652f\u4ed8\"),\n    SHIPPED(3, \"\u5df2\u53d1\u8d27\"),\n    DELIVERED(4, \"\u5df2\u9001\u8fbe\"),\n    CANCELLED(5, \"\u5df2\u53d6\u6d88\");\n    \n    \/\/ \u81ea\u5b9a\u4e49\u5b57\u6bb5\n    private final int code;\n    private final String desc;\n    \n    \/\/ \u5e26\u53c2\u6784\u9020\u65b9\u6cd5\uff08\u5fc5\u987b\u662fprivate\uff09\n    private OrderStatus(int code, String desc) {\n        this.code = code;\n        this.desc = desc;\n    }\n    \n    \/\/ \u63d0\u4f9bgetter\u65b9\u6cd5\n    public int getCode() {\n        return code;\n    }\n    \n    public String getDesc() {\n        return desc;\n    }\n    \n    \/\/ \u9759\u6001\u65b9\u6cd5\uff1a\u6839\u636e\u7f16\u7801\u83b7\u53d6\u679a\u4e3e\n    public static OrderStatus getByCode(int code) {\n        for (OrderStatus status : values()) {\n            if (status.code == code) {\n                return status;\n            }\n        }\n        throw new IllegalArgumentException(\"\u65e0\u6548\u7684\u8ba2\u5355\u72b6\u6001\u7f16\u7801\uff1a\" + code);\n    }\n}\n\n\/\/ \u4f7f\u7528\u793a\u4f8b\npublic class OrderService {\n    public static void main(String&#91;] args) {\n        OrderStatus status = OrderStatus.getByCode(2);\n        System.out.println(\"\u72b6\u6001\u7f16\u7801\uff1a\" + status.getCode());\n        System.out.println(\"\u72b6\u6001\u63cf\u8ff0\uff1a\" + status.getDesc());\n        \/\/ \u8f93\u51fa\uff1a\n        \/\/ \u72b6\u6001\u7f16\u7801\uff1a2\n        \/\/ \u72b6\u6001\u63cf\u8ff0\uff1a\u5df2\u652f\u4ed8\n    }\n}\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u679a\u4e3e\u7684\u9ad8\u7ea7\u7528\u6cd5\uff1aEnumSet \u4e0e EnumMap<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u63d0\u4f9b\u4e86\u4e13\u95e8\u9488\u5bf9\u679a\u4e3e\u7684\u96c6\u5408\u7c7b EnumSet \u548c EnumMap\uff0c\u5b83\u4eec\u5728\u6027\u80fd\u548c\u6613\u7528\u6027\u4e0a\u90fd\u4f18\u4e8e\u666e\u901a\u7684 HashSet \u548c HashMap\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. EnumSet\uff1a\u9ad8\u6548\u7684\u679a\u4e3e\u96c6\u5408<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">EnumSet \u662f\u62bd\u8c61\u7c7b\uff0c\u4e0d\u80fd\u901a\u8fc7 new \u521b\u5efa\uff0c\u9700\u4f7f\u7528\u9759\u6001\u5de5\u5382\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>noneOf (Class&gt; elementType)\uff1a\u521b\u5efa\u7a7a\u96c6\u5408<\/li>\n\n\n\n<li>allOf (Class)\uff1a\u521b\u5efa\u5305\u542b\u6240\u6709\u679a\u4e3e\u5e38\u91cf\u7684\u96c6\u5408<\/li>\n\n\n\n<li>of (E e1, E e2&#8230;)\uff1a\u521b\u5efa\u5305\u542b\u6307\u5b9a\u679a\u4e3e\u5e38\u91cf\u7684\u96c6\u5408<\/li>\n\n\n\n<li>complementOf (EnumSet&gt; s)\uff1a\u521b\u5efa\u5305\u542b\u6307\u5b9a\u96c6\u5408\u8865\u96c6\u7684\u96c6\u5408<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u793a\u4f8b\uff1aEnumSet \u7684\u4f7f\u7528<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.EnumSet;\n\npublic class EnumSetDemo {\n    public static void main(String&#91;] args) {\n        \/\/ \u521b\u5efa\u7a7a\u7684PlayerType\u7c7b\u578b\u96c6\u5408\n        EnumSet emptySet = EnumSet.noneOf(PlayerType.class);\n        System.out.println(\"\u7a7a\u96c6\u5408\uff1a\" + emptySet); \/\/ \u8f93\u51fa\uff1a&#91;]\n\n        \/\/ \u521b\u5efa\u5305\u542b\u6240\u6709\u679a\u4e3e\u7684\u96c6\u5408\n        EnumSet allSet = EnumSet.allOf(PlayerType.class);\n        System.out.println(\"\u6240\u6709\u73a9\u5bb6\u7c7b\u578b\uff1a\" + allSet); \/\/ \u8f93\u51fa\uff1a&#91;TANK, DAMAGE_DEALER, HEALER, SUPPORTER]\n\n        \/\/ \u521b\u5efa\u5305\u542b\u6307\u5b9a\u679a\u4e3e\u7684\u96c6\u5408\n        EnumSet combatSet = EnumSet.of(PlayerType.TANK, PlayerType.DAMAGE_DEALER);\n        System.out.println(\"\u6218\u6597\u578b\u73a9\u5bb6\uff1a\" + combatSet); \/\/ \u8f93\u51fa\uff1a&#91;TANK, DAMAGE_DEALER]\n\n        \/\/ \u521b\u5efa\u8865\u96c6\n        EnumSet supportSet = EnumSet.complementOf(combatSet);\n        System.out.println(\"\u652f\u63f4\u578b\u73a9\u5bb6\uff1a\" + supportSet); \/\/ \u8f93\u51fa\uff1a&#91;HEALER, SUPPORTER]\n    }\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. EnumMap\uff1a\u679a\u4e3e\u4e13\u7528\u7684 Map<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">EnumMap \u7684 key \u5fc5\u987b\u662f\u6307\u5b9a\u7684\u679a\u4e3e\u7c7b\u578b\uff0c\u6548\u7387\u6bd4 HashMap \u9ad8\uff08\u5e95\u5c42\u4f7f\u7528\u6570\u7ec4\u5b58\u50a8\uff09\uff0c\u521b\u5efa\u65f6\u9700\u8981\u6307\u5b9a\u679a\u4e3e\u7c7b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u793a\u4f8b\uff1aEnumMap \u7684\u4f7f\u7528<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.EnumMap;\nimport java.util.Map;\n\npublic class EnumMapDemo {\n    public static void main(String&#91;] args) {\n        \/\/ \u521b\u5efaEnumMap\uff0c\u6307\u5b9akey\u7c7b\u578b\u4e3aPlayerType\n        EnumMap&lt;PlayerType, String&gt; skillMap = new EnumMap&lt;&gt;(PlayerType.class);\n\n        \/\/ \u5b58\u5165\u6570\u636e\n        skillMap.put(PlayerType.TANK, \"\u5632\u8bbd\uff1a\u5438\u5f15\u654c\u4eba\u653b\u51fb\u81ea\u5df1\");\n        skillMap.put(PlayerType.DAMAGE_DEALER, \"\u66b4\u51fb\uff1a\u9020\u6210200%\u4f24\u5bb3\");\n        skillMap.put(PlayerType.HEALER, \"\u6cbb\u6108\u672f\uff1a\u6062\u590d\u961f\u53cb\u751f\u547d\u503c\");\n\n        \/\/ \u904d\u5386EnumMap\n        for (Map.Entry&lt;PlayerType, String&gt; entry : skillMap.entrySet()) {\n            System.out.println(entry.getKey() + \"\u7684\u6280\u80fd\uff1a\" + entry.getValue());\n        }\n\n        \/\/ \u6839\u636ekey\u83b7\u53d6value\n        String healerSkill = skillMap.get(PlayerType.HEALER);\n        System.out.println(\"\u6cbb\u7597\u5e08\u6280\u80fd\uff1a\" + healerSkill);\n    }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001\u679a\u4e3e\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\uff1a\u6700\u7b80\u5355\u5b89\u5168\u7684\u65b9\u5f0f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5355\u4f8b\u6a21\u5f0f\u8981\u6c42\u4e00\u4e2a\u7c7b\u4ec5\u6709\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u800c\u679a\u4e3e\u5929\u751f\u5c31\u662f\u5355\u4f8b\u7684\uff0c\u5e76\u4e14 Java \u865a\u62df\u673a\u4fdd\u8bc1\u4e86\u679a\u4e3e\u7684\u7ebf\u7a0b\u5b89\u5168\u548c\u5e8f\u5217\u5316\u5b89\u5168\uff0c\u662f\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u7684\u6700\u4f18\u65b9\u6848\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f20\u7edf\u5355\u4f8b\uff08\u53cc\u91cd\u68c0\u67e5\u9501\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Singleton {\n    \/\/  volatile\u4fdd\u8bc1\u53ef\u89c1\u6027\u548c\u7981\u6b62\u6307\u4ee4\u91cd\u6392\n    private static volatile Singleton instance;\n    \n    \/\/ \u79c1\u6709\u6784\u9020\u65b9\u6cd5\n    private Singleton() {}\n    \n    \/\/ \u53cc\u91cd\u68c0\u67e5\u9501\u83b7\u53d6\u5b9e\u4f8b\n    public static Singleton getInstance() {\n        if (instance == null) {\n            synchronized (Singleton.class) {\n                if (instance == null) {\n                    instance = new Singleton();\n                }\n            }\n        }\n        return instance;\n    }\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u679a\u4e3e\u5355\u4f8b\uff08\u63a8\u8350\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public enum EasySingleton {\n    \/\/ \u552f\u4e00\u5b9e\u4f8b\n    INSTANCE;\n    \n    \/\/ \u679a\u4e3e\u53ef\u4ee5\u62e5\u6709\u6210\u5458\u65b9\u6cd5\n    public void doSomething() {\n        System.out.println(\"\u679a\u4e3e\u5355\u4f8b\u6267\u884c\u64cd\u4f5c...\");\n    }\n    \n    \/\/ \u5916\u90e8\u83b7\u53d6\u5b9e\u4f8b\u7684\u65b9\u5f0f\n    public static Singleton getInstance() {\n        return INSTANCE;\n    }\n}\n\n\/\/ \u4f7f\u7528\u793a\u4f8b\npublic class EasySingletonDemo {\n    public static void main(String&#91;] args) {\n        EasySingleton singleton1 = EasySingleton.getInstance();\n        EasySingleton singleton2 = EasySingleton.getInstance();\n        \n        System.out.println(singleton1 == singleton2); \/\/ \u8f93\u51fa\uff1atrue\uff0c\u8bc1\u660e\u662f\u5355\u4f8b\n        singleton1.doSomething(); \/\/ \u8f93\u51fa\uff1a\u679a\u4e3e\u5355\u4f8b\u6267\u884c\u64cd\u4f5c...\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u679a\u4e3e\u5355\u4f8b\u7684\u4f18\u52bf\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4ee3\u7801\u7b80\u6d01\uff0c\u65e0\u9700\u624b\u52a8\u5904\u7406\u7ebf\u7a0b\u5b89\u5168<\/li>\n\n\n\n<li>\u5929\u7136\u9632\u6b62\u53cd\u5c04\u521b\u5efa\u5b9e\u4f8b\uff08Java \u4e0d\u5141\u8bb8\u901a\u8fc7\u53cd\u5c04\u521b\u5efa\u679a\u4e3e\u5b9e\u4f8b\uff09<\/li>\n\n\n\n<li>\u81ea\u52a8\u652f\u6301\u5e8f\u5217\u5316\uff08\u679a\u4e3e\u9ed8\u8ba4\u5b9e\u73b0 Serializable\uff0c\u4e14\u53cd\u5e8f\u5217\u5316\u65f6\u4e0d\u4f1a\u521b\u5efa\u65b0\u5b9e\u4f8b\uff09<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u679a\u4e3e\u8fdc\u4e0d\u6b62\u662f\u7b80\u5355\u7684\u5e38\u91cf\u5b9a\u4e49\uff0c\u5b83\u662f\u4e00\u79cd\u529f\u80fd\u5f3a\u5927\u7684\u7c7b\uff0c\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9690\u5f0f\u7ee7\u627f java.lang.Enum\uff0c\u4e0d\u53ef\u7ee7\u627f\u5176\u4ed6\u7c7b\u4f46\u53ef\u5b9e\u73b0\u63a5\u53e3<\/li>\n\n\n\n<li>\u679a\u4e3e\u5e38\u91cf\u662f\u5355\u4f8b\u7684\uff0c\u63a8\u8350\u4f7f\u7528 == \u8fdb\u884c\u6bd4\u8f83<\/li>\n\n\n\n<li>\u652f\u6301\u81ea\u5b9a\u4e49\u5b57\u6bb5\u548c\u5e26\u53c2\u6784\u9020\u65b9\u6cd5\uff0c\u53ef\u5b58\u50a8\u66f4\u591a\u4fe1\u606f<\/li>\n\n\n\n<li>\u4e0e switch \u8bed\u53e5\u5b8c\u7f8e\u517c\u5bb9\uff0c\u4ee3\u7801\u53ef\u8bfb\u6027\u66f4\u9ad8<\/li>\n\n\n\n<li>\u914d\u5408 EnumSet \u548c EnumMap \u4f7f\u7528\uff0c\u6027\u80fd\u66f4\u4f18<\/li>\n\n\n\n<li>\u662f\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u7684\u6700\u4f18\u65b9\u6848\uff0c\u5b89\u5168\u7b80\u6d01<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u5e2e\u52a9\u5927\u5bb6\u5168\u9762\u638c\u63e1 Java \u679a\u4e3e\u7684\u7528\u6cd5\uff0c\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u7075\u6d3b\u8fd0\u7528\u679a\u4e3e\u63d0\u5347\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3001\u5b89\u5168\u6027\u548c\u6548\u7387\u3002\u5982\u679c\u6709\u4efb\u4f55\u7591\u95ee\u6216\u8865\u5145\uff0c\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u7559\u8a00\u4ea4\u6d41\uff5e<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u4eca\u5929\u60f3\u548c\u5927\u5bb6\u6df1\u5165\u804a\u804a Java \u4e2d\u7684\u679a\u4e3e\uff08enum\uff09\u3002\u4f5c\u4e3a Java 1.5 \u7248\u672c\u5f15\u5165\u7684\u91cd<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"https:\/\/yunyanglib.cn\/?p=1289\" class=\"link-btn theme-btn\"><span>Read More <\/span> <i class=\"fa fa-caret-right\"><\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":1292,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[15],"class_list":["post-1289","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-java"],"_links":{"self":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1289","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1289"}],"version-history":[{"count":4,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1289\/revisions"}],"predecessor-version":[{"id":1297,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1289\/revisions\/1297"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/1292"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1289"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1289"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1289"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}