{"id":1232,"date":"2022-10-27T23:01:42","date_gmt":"2022-10-27T15:01:42","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1232"},"modified":"2022-11-27T12:39:48","modified_gmt":"2022-11-27T04:39:48","slug":"%e9%9b%86%e5%90%88-treemap%e4%b8%a4%e7%a7%8d%e6%b7%bb%e5%8a%a0%e6%96%b9%e5%bc%8f%e7%9a%84%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1232","title":{"rendered":"\u96c6\u5408-TreeMap\u4e24\u79cd\u6dfb\u52a0\u65b9\u5f0f\u7684\u4f7f\u7528"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P557;\r\n\r\nimport org.junit.jupiter.api.Test;\r\n\r\nimport java.util.*;\r\n\r\n\/**\r\n * @author RichieZhang\r\n * @create 2022-10-27 \u4e0b\u5348 9:21\r\n *\/\r\npublic class TreeMapTest {\r\n\r\n    \/\/\u5411TreeMap\u4e2d\u6dfb\u52a0key-value\uff0c\u8981\u6c42key\u5fc5\u987b\u662f\u7531\u540c\u4e00\u4e2a\u7c7b\u521b\u5efa\u7684\u5bf9\u8c61\r\n    \/\/\u56e0\u4e3a\u8981\u6309\u7167key\u8fdb\u884c\u6392\u5e8f\uff1a\u81ea\u7136\u6392\u5e8f\u3001\u5b9a\u5236\u6392\u5e8f\r\n    \/\/\u81ea\u7136\u6392\u5e8f\r\n    @Test\r\n    public void test1(){\r\n        TreeMap map = new TreeMap();\r\n        User u1 = new User(\"Tom\",23);\r\n        User u2 = new User(\"Jerry\",32);\r\n        User u3 = new User(\"Jack\",20);\r\n        User u4 = new User(\"Rose\",18);\r\n        map.put(u1,98);\r\n        map.put(u2,89);\r\n        map.put(u3,76);\r\n        map.put(u4,100);\r\n\r\n        Set entrySet = map.entrySet();\r\n        Iterator iterator1 = entrySet.iterator();\r\n        while (iterator1.hasNext()){\r\n            Object obj = iterator1.next();\r\n            \/\/entrySet\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u90fd\u662fentry\r\n            Map.Entry entry = (Map.Entry) obj;\r\n            System.out.println(entry.getKey() + \"---->\" + entry.getValue());\r\n\r\n        }\r\n    }\r\n\r\n    @Test\r\n    public void test2(){\r\n        TreeMap map = new TreeMap(new Comparator() {\r\n            @Override\r\n            public int compare(Object o1, Object o2) {\r\n                if (o1 instanceof User &amp;&amp; o2 instanceof User){\r\n                    User u1 = (User) o1;\r\n                    User u2 = (User) o2;\r\n                    return Integer.compare(u1.getAge(),u2.getAge());\r\n                }\r\n                throw new RuntimeException(\"\u8f93\u5165\u7684\u7c7b\u578b\u4e0d\u5339\u914d\uff01\");\r\n            }\r\n        });\r\n        User u1 = new User(\"Tom\",23);\r\n        User u2 = new User(\"Jerry\",32);\r\n        User u3 = new User(\"Jack\",20);\r\n        User u4 = new User(\"Rose\",18);\r\n        map.put(u1,98);\r\n        map.put(u2,89);\r\n        map.put(u3,76);\r\n        map.put(u4,100);\r\n\r\n        Set entrySet = map.entrySet();\r\n        Iterator iterator1 = entrySet.iterator();\r\n        while (iterator1.hasNext()){\r\n            Object obj = iterator1.next();\r\n            \/\/entrySet\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u90fd\u662fentry\r\n            Map.Entry entry = (Map.Entry) obj;\r\n            System.out.println(entry.getKey() + \"---->\" + entry.getValue());\r\n\r\n        }\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P557;\r\n\r\n\/**\r\n * @author RichieZhang\r\n * @create 2022-10-26 \u4e0b\u5348 8:16\r\n *\/\r\npublic class User implements Comparable {\r\n\r\n    private String name;\r\n    private int age;\r\n\r\n    public User(){\r\n\r\n    }\r\n\r\n    public User(String name, int age) {\r\n        this.name = name;\r\n        this.age = age;\r\n    }\r\n\r\n    public String getName() {\r\n        return name;\r\n    }\r\n\r\n    public void setName(String name) {\r\n        this.name = name;\r\n    }\r\n\r\n    public int getAge() {\r\n        return age;\r\n    }\r\n\r\n    public void setAge(int age) {\r\n        this.age = age;\r\n    }\r\n\r\n    @Override\r\n    public String toString() {\r\n        return \"User{\" +\r\n                \"name='\" + name + '\\'' +\r\n                \", age=\" + age +\r\n                '}';\r\n    }\r\n\r\n    @Override\r\n    public boolean equals(Object o) {\r\n        System.out.println(\"User equals()....\");\r\n        if (this == o) return true;\r\n        if (o == null || getClass() != o.getClass()) return false;\r\n\r\n        User user = (User) o;\r\n\r\n        if (age != user.age) return false;\r\n        return name != null ? name.equals(user.name) : user.name == null;\r\n    }\r\n\r\n    @Override\r\n    public int hashCode() { \/\/return name.hashCode() + age;\r\n        int result = name != null ? name.hashCode() : 0;\r\n        result = 31 * result + age;\r\n        return result;\r\n    }\r\n\r\n    \/\/\u6309\u7167\u59d3\u540d\u4ece\u5927\u5230\u5c0f\u6392\u5217,\u5e74\u9f84\u4ece\u5c0f\u5230\u5927\u6392\u5217\r\n    @Override\r\n    public int compareTo(Object o) {\r\n        if(o instanceof User){\r\n            User user = (User) o;\r\n\/\/            return -this.name.compareTo(user.name);\r\n            int compare = -this.name.compareTo(user.name);\r\n            if (compare != 0){\r\n                return compare;\r\n            }else {\r\n                return Integer.compare(this.age, user.age);\r\n            }\r\n        }else {\r\n            throw new RuntimeException(\"\u8f93\u5165\u7684\u7c7b\u578b\u4e0d\u5339\u914d\");\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[46],"class_list":["post-1232","post","type-post","status-publish","format-standard","hentry","category-java-code","tag-java"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1232"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1232"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1232\/revisions"}],"predecessor-version":[{"id":1233,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1232\/revisions\/1233"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}