{"id":1446,"date":"2026-05-18T08:55:08","date_gmt":"2026-05-18T00:55:08","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=1446"},"modified":"2026-05-18T08:55:08","modified_gmt":"2026-05-18T00:55:08","slug":"%e3%80%90java%e3%80%91comparable-%e5%92%8c-comparator-%e7%9a%84%e5%8c%ba%e5%88%ab%ef%bc%9a%e4%bb%8e%e5%8e%9f%e7%90%86%e5%88%b0%e4%bb%a3%e7%a0%81%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=1446","title":{"rendered":"\u3010Java\u3011Comparable \u548c Comparator \u7684\u533a\u522b\uff1a\u4ece\u539f\u7406\u5230\u4ee3\u7801\u5b9e\u6218"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u4eca\u5929\u6765\u548c\u5927\u5bb6\u6df1\u5165\u804a\u804a Java \u4e2d\u4e24\u4e2a\u6838\u5fc3\u7684\u6bd4\u8f83\u63a5\u53e3\uff1a<code>Comparable<\/code>\u548c<code>Comparator<\/code>\u3002\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u5bf9\u5bf9\u8c61\u8fdb\u884c\u6392\u5e8f\uff08\u6bd4\u5982\u5217\u8868\u6392\u5e8f\u3001\u96c6\u5408\u53bb\u91cd\u7b49\uff09\uff0c\u8fd9\u4e24\u4e2a\u63a5\u53e3\u6b63\u662f\u5b9e\u73b0\u5bf9\u8c61\u6bd4\u8f83\u7684\u5173\u952e\uff0c\u4f46\u5f88\u591a\u5c0f\u4f19\u4f34\u5bb9\u6613\u6df7\u6dc6\u5b83\u4eec\u7684\u4f7f\u7528\u573a\u666f\u3002\u8fd9\u7bc7\u6587\u7ae0\u5c31\u4ece\u5b9a\u4e49\u3001\u7528\u6cd5\u3001\u6838\u5fc3\u533a\u522b\u4e09\u4e2a\u7ef4\u5ea6\uff0c\u7ed3\u5408\u4ee3\u7801\u793a\u4f8b\u5e2e\u5927\u5bb6\u5f7b\u5e95\u641e\u61c2\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u6838\u5fc3\u5b9a\u4e49\uff1a\u5404\u81ea\u7684 &#8220;\u804c\u8d23\u8fb9\u754c&#8221;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\u660e\u786e\u4e24\u4e2a\u63a5\u53e3\u7684\u6838\u5fc3\u5b9a\u4f4d\uff0c\u8fd9\u662f\u533a\u5206\u5b83\u4eec\u7684\u57fa\u7840\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Comparable<\/strong>\uff1a\u300c\u81ea\u7136\u6392\u5e8f\u300d\u63a5\u53e3\uff0c\u5c5e\u4e8e<strong>\u7c7b\u5185\u90e8\u5b9e\u73b0<\/strong>\u3002\u5f53\u4e00\u4e2a\u7c7b\u5b9e\u73b0\u4e86<code>Comparable<\/code>\u63a5\u53e3\uff0c\u5c31\u610f\u5473\u7740\u8be5\u7c7b\u7684\u5bf9\u8c61\u5177\u5907\u4e86 &#8220;\u5929\u751f&#8221; \u7684\u6bd4\u8f83\u80fd\u529b\uff0c\u65e0\u9700\u989d\u5916\u4f9d\u8d56\u5c31\u80fd\u76f4\u63a5\u6392\u5e8f\u3002<\/li>\n\n\n\n<li><strong>Comparator<\/strong>\uff1a\u300c\u5b9a\u5236\u6392\u5e8f\u300d\u63a5\u53e3\uff0c\u5c5e\u4e8e<strong>\u7c7b\u5916\u90e8\u5b9e\u73b0<\/strong>\u3002\u5b83\u4e0d\u4fee\u6539\u539f\u6709\u7c7b\u7684\u4ee3\u7801\uff0c\u800c\u662f\u901a\u8fc7\u5916\u90e8\u5b9a\u4e49\u6bd4\u8f83\u89c4\u5219\uff0c\u8ba9\u540c\u4e00\u4e2a\u7c7b\u7684\u5bf9\u8c61\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u9700\u6c42\u7075\u6d3b\u6392\u5e8f\uff08\u6bd4\u5982\u4e00\u4e2a User \u7c7b\u65e2\u53ef\u4ee5\u6309\u5e74\u9f84\u6392\uff0c\u4e5f\u53ef\u4ee5\u6309\u59d3\u540d\u6392\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u4ee3\u7801\u5b9e\u6218\uff1a\u4e24\u79cd\u63a5\u53e3\u7684\u5177\u4f53\u7528\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5149\u8bf4\u7406\u8bba\u4e0d\u591f\uff0c\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u5b9e\u9645\u573a\u666f\u6765\u6f14\u793a \u2014\u2014 \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a<code>User<\/code>\u7c7b\uff0c\u9700\u8981\u5bf9\u5176\u5bf9\u8c61\u8fdb\u884c\u6392\u5e8f\uff0c\u5206\u522b\u7528<code>Comparable<\/code>\u548c<code>Comparator<\/code>\u5b9e\u73b0\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Comparable\uff1a\u5b9e\u73b0\u81ea\u7136\u6392\u5e8f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\uff0c\u8ba9<code>User<\/code>\u7c7b\u5b9e\u73b0<code>Comparable<\/code>\u63a5\u53e3\uff0c\u5e76\u91cd\u5199<code>compareTo(T o)<\/code>\u65b9\u6cd5\u3002\u8fd9\u91cc\u6211\u4eec\u5b9a\u4e49 &#8220;\u81ea\u7136\u6392\u5e8f&#8221; \u4e3a\u300c\u6309\u5e74\u9f84\u5347\u5e8f\u6392\u5217\u300d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.List;\n\n\/\/ \u5b9e\u73b0Comparable\u63a5\u53e3\uff0c\u6307\u5b9a\u6bd4\u8f83\u7684\u5bf9\u8c61\u7c7b\u578b\u4e3aUser\npublic class User implements Comparable&lt;User> {\n    private String id;\n    private String name;\n    private int age;\n\n    \/\/ \u6784\u9020\u65b9\u6cd5\n    public User(String id, String name, int age) {\n        this.name = name;\n        this.age = age;\n    }\n\n    \/\/ \u91cd\u5199compareTo\u65b9\u6cd5\uff1a\u6309\u5e74\u9f84\u5347\u5e8f\u6392\u5e8f\n    @Override\n    public int compareTo(User other) {\n        \/\/ \u6838\u5fc3\u89c4\u5219\uff1a\n        \/\/ \u8fd4\u56de\u8d1f\u6570\uff1a\u5f53\u524d\u5bf9\u8c61 \u6392\u5728\u524d\u9762\uff09\n        \/\/ \u8fd4\u56de0\uff1a\u5f53\u524d\u5bf9\u8c61 == \u76ee\u6807\u5bf9\u8c61\uff08\u4f4d\u7f6e\u4e0d\u53d8\uff09\n        \/\/ \u8fd4\u56de\u6b63\u6570\uff1a\u5f53\u524d\u5bf9\u8c61 > \u76ee\u6807\u5bf9\u8c61\uff08\u6392\u5728\u540e\u9762\uff09\n        return this.age - other.age;\n    }\n\n    \/\/ toString\u65b9\u6cd5\uff0c\u65b9\u4fbf\u6253\u5370\n    @Override\n    public String toString() {\n        return \"User{name='\" + name + \"', age=\" + age + \"}\";\n    }\n\n    \/\/ \u6d4b\u8bd5\u65b9\u6cd5\n    public static void main(String&#91;] args) {\n        \n        \/\/ \u6d4b\u8bd5Comparable\u63a5\u53e3\uff1a\u6309\u5e74\u9f84\u5347\u5e8f\u6392\u5e8f\n        List&lt;User> userList = new ArrayList&lt;>();\n        userList.add(new User(\"1\", \"\u5f20\u4e09\", 25));\n        userList.add(new User(\"2\", \"\u674e\u56db\", 20));\n        userList.add(new User(\"3\", \"\u738b\u4e94\", 30));\n\n        \/\/ \u76f4\u63a5\u8c03\u7528Collections.sort()\uff0c\u65e0\u9700\u989d\u5916\u6bd4\u8f83\u5668\n        Collections.sort(userList);\n\n        \/\/ \u6253\u5370\u7ed3\u679c\uff1a\u6309\u5e74\u9f84\u5347\u5e8f\u6392\u5217\n        System.out.println(\"Comparable\u81ea\u7136\u6392\u5e8f\u7ed3\u679c\uff1a\");\n        for (User user : userList) {\n            System.out.println(user);\n        }\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8fd0\u884c\u7ed3\u679c<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Comparable\u81ea\u7136\u6392\u5e8f\u7ed3\u679c\uff1a\nUser(name=\u674e\u56db, age=20)\nUser(name=\u5f20\u4e09, age=25)\nUser(name=\u738b\u4e94, age=30)\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5173\u952e\u8bf4\u660e<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9e\u73b0<code>Comparable<\/code>\u540e\uff0c<code>User<\/code>\u5bf9\u8c61\u5c31\u5177\u5907\u4e86 &#8220;\u81ea\u7136\u6392\u5e8f&#8221; \u80fd\u529b\uff0c\u76f4\u63a5\u8c03\u7528<code>Collections.sort(list)<\/code>\u5373\u53ef\u5b8c\u6210\u6392\u5e8f\uff0c\u65e0\u9700\u989d\u5916\u53c2\u6570\u3002<\/li>\n\n\n\n<li><code>compareTo<\/code>\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u89c4\u5219\u662f\u6838\u5fc3\uff0c\u8bb0\u4f4f &#8220;\u51cf\u53f7\u987a\u5e8f&#8221;\uff1a<code>this.\u5c5e\u6027 - other.\u5c5e\u6027<\/code>\u662f\u5347\u5e8f\uff0c\u53cd\u8fc7\u6765\u5c31\u662f\u964d\u5e8f\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Comparator\uff1a\u5b9e\u73b0\u5b9a\u5236\u6392\u5e8f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u73b0\u5728\u6709\u65b0\u9700\u6c42\uff1a\u4e0d\u4fee\u6539<code>User<\/code>\u7c7b\u7684\u4ee3\u7801\uff08\u6bd4\u5982<code>User<\/code>\u662f\u7b2c\u4e09\u65b9\u4f9d\u8d56\u7c7b\uff0c\u65e0\u6cd5\u4fee\u6539\uff09\uff0c\u4f46\u9700\u8981\u6309\u300c\u59d3\u540d\u9996\u5b57\u6bcd\u964d\u5e8f\u300d\u6392\u5e8f\uff0c\u8fd9\u65f6\u5c31\u8be5<code>Comparator<\/code>\u51fa\u573a\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u901a\u8fc7\u4e24\u79cd\u65b9\u5f0f\u5b9e\u73b0<code>Comparator<\/code>\uff1a\u533f\u540d\u5185\u90e8\u7c7b\uff08\u7b80\u6d01\uff09\u548c Lambda \u8868\u8fbe\u5f0f\uff08Java 8 + \u63a8\u8350\uff09\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.ArrayList;\nimport java.util.Collections;\nimport java.util.Comparator;\nimport java.util.List;\n\n\/\/ \u539f\u59cbUser\u7c7b\uff08\u672a\u5b9e\u73b0Comparable\uff0c\u65e0\u6cd5\u76f4\u63a5\u6392\u5e8f\uff09\nclass User {\n    private String id\uff1b\n    private String name;\n    private int age;\n\n    public User(String id, String name, int age) {\n        this.id = id;\n        this.name = name;\n        this.age = age;\n    }\n\n    \/\/ getter\u65b9\u6cd5\uff08\u5fc5\u987b\u63d0\u4f9b\uff0c\u56e0\u4e3aComparator\u5728\u5916\u90e8\uff0c\u9700\u8981\u83b7\u53d6\u5c5e\u6027\uff09\n    public String getId() {\n        return id;\n    }\n\n    public String getName() {\n        return name;\n    }\n\n    public int getAge() {\n        return age;\n    }\n\n    @Override\n    public String toString() {\n        return \"User{name='\" + name + \"', age=\" + age + \"}\";\n    }\n\n    public static void main(String&#91;] args) {\n        List&lt;User> userList = new ArrayList&lt;>();\n        userList.add(new User(\"1\", \"\u5f20\u4e09\", 25));\n        userList.add(new User(\"2\", \"\u674e\u56db\", 20));\n        userList.add(new User(\"3\", \"\u738b\u4e94\", 30));\n\n        \/\/ \u65b9\u5f0f1\uff1a\u533f\u540d\u5185\u90e8\u7c7b\u5b9e\u73b0Comparator\uff08\u6309\u59d3\u540d\u9996\u5b57\u6bcd\u964d\u5e8f\uff09\n        userList.sort(new Comparator&lt;User>() {\n            @Override\n            public int compare(User o1, User o2) {\n                return o1.getName().compareTo(o2.getName());\n            }\n        });\n\n        System.out.println(\"Comparator\u5b9a\u5236\u6392\u5e8f\uff08\u59d3\u540d\u964d\u5e8f\uff09\uff1a\");\n        for (User user : userList) {\n            System.out.println(user);\n        }\n\n        \/\/ \u65b9\u5f0f2\uff1aLambda\u8868\u8fbe\u5f0f\u7b80\u5316\uff08Java 8+\uff09\uff0c\u6309\u5e74\u9f84\u964d\u5e8f\n        System.out.println(\"\\nComparator Lambda\u6392\u5e8f\uff08\u5e74\u9f84\u964d\u5e8f\uff09\uff1a\");\n        userList.sort((u1, u2) -> u2.getAge() - u1.getAge());\n        userList.forEach(System.out::println);\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8fd0\u884c\u7ed3\u679c<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Comparator\u5b9a\u5236\u6392\u5e8f\uff08\u59d3\u540d\u964d\u5e8f\uff09\uff1a\nUser{name='\u738b\u4e94', age=30}\nUser{name='\u5f20\u4e09', age=25}\nUser{name='\u674e\u56db', age=20}\n\nComparator Lambda\u6392\u5e8f\uff08\u5e74\u9f84\u964d\u5e8f\uff09\uff1a\nUser{name='\u738b\u4e94', age=30}\nUser{name='\u5f20\u4e09', age=25}\nUser{name='\u674e\u56db', age=20}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5173\u952e\u8bf4\u660e<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Comparator<\/code>\u662f\u72ec\u7acb\u4e8e<code>User<\/code>\u7c7b\u7684\u5916\u90e8\u6bd4\u8f83\u5668\uff0c\u65e0\u9700\u4fee\u6539\u539f\u6709\u7c7b\u4ee3\u7801\uff0c\u7075\u6d3b\u6027\u6781\u9ad8\u3002<\/li>\n\n\n\n<li>\u5f53\u9700\u8981\u591a\u79cd\u6392\u5e8f\u89c4\u5219\u65f6\uff0c\u53ea\u9700\u5b9a\u4e49\u591a\u4e2a<code>Comparator<\/code>\u5b9e\u73b0\uff08\u6216\u7528 Lambda \u5feb\u901f\u5207\u6362\uff09\uff0c\u65e0\u9700\u6539\u52a8\u5bf9\u8c61\u672c\u8eab\u3002<\/li>\n\n\n\n<li>Java 8 + \u4e2d\uff0c<code>List<\/code>\u63a5\u53e3\u65b0\u589e\u4e86<code>sort(Comparator c)<\/code>\u65b9\u6cd5\uff0c\u914d\u5408 Lambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u8ba9\u4ee3\u7801\u66f4\u7b80\u6d01\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u6838\u5fc3\u533a\u522b\u4e0e\u9009\u62e9\u5efa\u8bae<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u603b\u7ed3\u51fa\u4e24\u8005\u7684\u6838\u5fc3\u533a\u522b\uff0c\u7528\u8868\u683c\u66f4\u6e05\u6670\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">\u7279\u6027<\/th><th class=\"has-text-align-left\" data-align=\"left\">Comparable<\/th><th class=\"has-text-align-left\" data-align=\"left\">Comparator<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">\u5b9e\u73b0\u4f4d\u7f6e<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u7c7b\u5185\u90e8\uff08implements Comparable\uff09<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u7c7b\u5916\u90e8\uff08\u72ec\u7acb\u5b9e\u73b0\u6216\u533f\u540d\u5185\u90e8\u7c7b\uff09<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u6392\u5e8f\u65b9\u5f0f<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u81ea\u7136\u6392\u5e8f\uff08\u56fa\u5b9a\u4e00\u79cd\u89c4\u5219\uff09<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u5b9a\u5236\u6392\u5e8f\uff08\u53ef\u591a\u79cd\u89c4\u5219\uff09<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u4ee3\u7801\u4fb5\u5165\u6027<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u6709\uff08\u9700\u4fee\u6539\u539f\u6709\u7c7b\uff09<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u65e0\uff08\u4e0d\u5f71\u54cd\u539f\u6709\u7c7b\uff09<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u4f7f\u7528\u573a\u666f<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u7c7b\u7684\u5bf9\u8c61\u53ea\u6709\u4e00\u79cd\u6392\u5e8f\u903b\u8f91<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u7c7b\u7684\u5bf9\u8c61\u9700\u8981\u591a\u79cd\u6392\u5e8f\u903b\u8f91\uff0c\u6216\u65e0\u6cd5\u4fee\u6539\u539f\u7c7b<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u6838\u5fc3\u65b9\u6cd5<\/td><td class=\"has-text-align-left\" data-align=\"left\">int compareTo(T o)<\/td><td class=\"has-text-align-left\" data-align=\"left\">int compare(T o1, T o2)<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u8c03\u7528\u65b9\u5f0f<\/td><td class=\"has-text-align-left\" data-align=\"left\">Collections.sort(list)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Collections.sort(list, comparator)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u9009\u62e9\u5efa\u8bae<\/strong>\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5982\u679c\u4f60\u7684\u7c7b\u662f\u81ea\u5b9a\u4e49\u7684\uff0c\u4e14\u6392\u5e8f\u89c4\u5219\u56fa\u5b9a\uff08\u6bd4\u5982<code>Integer<\/code>\u6309\u6570\u503c\u6392\u5e8f\u3001<code>String<\/code>\u6309\u5b57\u5178\u5e8f\u6392\u5e8f\uff09\uff0c\u4f18\u5148\u4f7f\u7528<code>Comparable<\/code>\uff0c\u8ba9\u5bf9\u8c61\u5177\u5907 &#8220;\u5929\u7136\u53ef\u6bd4\u8f83&#8221; \u7684\u80fd\u529b\uff0c\u4ee3\u7801\u66f4\u7b80\u6d01\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u4f60\u7684\u7c7b\u662f\u7b2c\u4e09\u65b9\u63d0\u4f9b\u7684\uff08\u65e0\u6cd5\u4fee\u6539\u6e90\u7801\uff09\uff0c\u6216\u9700\u8981\u591a\u79cd\u6392\u5e8f\u89c4\u5219\uff08\u6bd4\u5982 User \u7c7b\u65e2\u6309\u5e74\u9f84\u6392\uff0c\u53c8\u6309\u59d3\u540d\u6392\uff09\uff0c\u4f18\u5148\u4f7f\u7528<code>Comparator<\/code>\uff0c\u7075\u6d3b\u6027\u66f4\u9ad8\uff0c\u7b26\u5408 &#8220;\u5f00\u95ed\u539f\u5219&#8221;\uff08\u5bf9\u6269\u5c55\u5f00\u653e\uff0c\u5bf9\u4fee\u6539\u5173\u95ed\uff09\u3002<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u5e38\u89c1\u5751\u70b9\u63d0\u9192<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7a7a\u6307\u9488\u98ce\u9669<\/strong>\uff1a\u65e0\u8bba\u662f<code>compareTo<\/code>\u8fd8\u662f<code>compare<\/code>\u65b9\u6cd5\uff0c\u90fd\u8981\u6ce8\u610f\u5bf9\u8c61\u4e3a\u7a7a\u7684\u60c5\u51b5\u3002\u6bd4\u5982\u6bd4\u8f83\u59d3\u540d\u65f6\uff0c\u5148\u5224\u65ad<code>name<\/code>\u662f\u5426\u4e3a null\uff0c\u907f\u514d<code>NullPointerException<\/code>\u3002<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u5b89\u5168\u7684\u6bd4\u8f83\u65b9\u5f0f\n@Override\npublic int compare(User u1, User u2) {\n    if (u1.getName() == null) return -1;\n    if (u2.getName() == null) return 1;\n    return u1.getName().compareTo(u2.getName());\n}<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e00\u81f4\u6027\u95ee\u9898<\/strong>\uff1a\u5982\u679c\u540c\u65f6\u4f7f\u7528<code>Comparable<\/code>\u548c<code>Comparator<\/code>\uff0c\u8981\u786e\u4fdd\u6392\u5e8f\u89c4\u5219\u7684\u4e00\u81f4\u6027\uff0c\u907f\u514d\u51fa\u73b0\u903b\u8f91\u6df7\u4e71\u3002<\/li>\n\n\n\n<li><strong>\u57fa\u672c\u7c7b\u578b\u5305\u88c5\u7c7b<\/strong>\uff1aJava \u4e2d<code>Integer<\/code>\u3001<code>String<\/code>\u3001<code>Date<\/code>\u7b49\u7c7b\u5df2\u7ecf\u5b9e\u73b0\u4e86<code>Comparable<\/code>\u63a5\u53e3\uff0c\u53ef\u76f4\u63a5\u6392\u5e8f\uff0c\u65e0\u9700\u91cd\u590d\u5b9e\u73b0\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u603b\u7ed3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Comparable<\/code>\u662f &#8220;\u5185\u90e8\u89c4\u5219&#8221;\uff0c\u8ba9\u5bf9\u8c61\u81ea\u5e26\u6392\u5e8f\u80fd\u529b\uff1b<code>Comparator<\/code>\u662f &#8220;\u5916\u90e8\u89c4\u5219&#8221;\uff0c\u8ba9\u6392\u5e8f\u903b\u8f91\u7075\u6d3b\u53ef\u6269\u5c55\u3002\u4e24\u8005\u6ca1\u6709\u7edd\u5bf9\u7684\u4f18\u52a3\uff0c\u6838\u5fc3\u662f\u6839\u636e\u5b9e\u9645\u9700\u6c42\u9009\u62e9\uff1a\u56fa\u5b9a\u6392\u5e8f\u7528<code>Comparable<\/code>\uff0c\u7075\u6d3b\u6392\u5e8f\u7528<code>Comparator<\/code>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u7ed3\u5408\u4ee3\u7801\u793a\u4f8b\u7684\u89e3\u6790\uff0c\u80fd\u5e2e\u5927\u5bb6\u5f7b\u5e95\u641e\u61c2\u4e24\u8005\u7684\u533a\u522b\uff5e \u5982\u679c\u4f60\u6709\u5176\u4ed6 Java \u96c6\u5408\u76f8\u5173\u7684\u95ee\u9898\uff0c\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u4ea4\u6d41\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u4eca\u5929\u6765\u548c\u5927\u5bb6\u6df1\u5165\u804a\u804a Java \u4e2d\u4e24\u4e2a\u6838\u5fc3\u7684\u6bd4\u8f83\u63a5\u53e3\uff1aComparable\u548cCompara<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"https:\/\/yunyanglib.cn\/?p=1446\" 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":1488,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[15],"class_list":["post-1446","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\/1446","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=1446"}],"version-history":[{"count":5,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1446\/revisions"}],"predecessor-version":[{"id":1451,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1446\/revisions\/1451"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/1488"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}