{"id":1226,"date":"2022-10-27T22:59:07","date_gmt":"2022-10-27T14:59:07","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1226"},"modified":"2022-11-27T12:39:48","modified_gmt":"2022-11-27T04:39:48","slug":"%e9%9b%86%e5%90%88-treeset%e7%9a%84%e8%af%be%e5%90%8e%e7%bb%83%e4%b9%a0","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1226","title":{"rendered":"\u96c6\u5408-TreeSet\u7684\u8bfe\u540e\u7ec3\u4e60"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P546;\r\n\r\n\/**\r\n * \u5b9a\u4e49\u4e00\u4e2a Employee \u7c7b\u3002\r\n * \u8be5\u7c7b\u5305\u542b\uff1aprivate \u6210\u5458\u53d8\u91cf name,age,birthday\uff0c\u5176\u4e2d birthday \u4e3aMyDate \u7c7b\u7684\u5bf9\u8c61\uff1b\r\n * \u5e76\u4e3a\u6bcf\u4e00\u4e2a\u5c5e\u6027\u5b9a\u4e49 getter, setter \u65b9\u6cd5\uff1b\r\n * \u5e76\u91cd\u5199 toString \u65b9\u6cd5\u8f93\u51fa name, age, birthday\r\n *\r\n * @author RichieZhang\r\n * @create 2022-10-27 \u4e0b\u5348 3:08\r\n *\/\r\npublic class Employee implements Comparable {\r\n\r\n    private String name;\r\n    private int age;\r\n    private MyDate birthday;\r\n\r\n    public Employee() {\r\n    }\r\n\r\n    public Employee(String name, int age, MyDate birthday) {\r\n        this.name = name;\r\n        this.age = age;\r\n        this.birthday = birthday;\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    public MyDate getBirthday() {\r\n        return birthday;\r\n    }\r\n\r\n    public void setBirthday(MyDate birthday) {\r\n        this.birthday = birthday;\r\n    }\r\n\r\n    @Override\r\n    public String toString() {\r\n        return \"Employee{\" +\r\n                \"name='\" + name + '\\'' +\r\n                \", age=\" + age +\r\n                \", birthday=\" + birthday +\r\n                '}';\r\n    }\r\n\r\n    \/\/\u6309 name \u6392\u5e8f\r\n    @Override\r\n    public int compareTo(Object o) {\r\n        if (o instanceof Employee){\r\n            Employee e = (Employee) o;\r\n            return this.name.compareTo(e.name);\r\n        }\r\n\/\/        return 0;\r\n        throw new RuntimeException(\"\u4f20\u5165\u7684\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\uff01\");\r\n    }\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P546;\r\n\r\n\/**\r\n * MyDate \u7c7b\u5305\u542b:\r\n * private \u6210\u5458\u53d8\u91cf year,month,day\uff1b\u5e76\u4e3a\u6bcf\u4e00\u4e2a\u5c5e\u6027\u5b9a\u4e49 getter, setter\u65b9\u6cd5\uff1b\r\n *\r\n * @author RichieZhang\r\n * @create 2022-10-27 \u4e0b\u5348 3:07\r\n *\/\r\npublic class MyDate implements Comparable{\r\n\r\n    private int year;\r\n    private int month;\r\n    private int day;\r\n\r\n    public MyDate() {\r\n    }\r\n\r\n    public MyDate(int year, int month, int day) {\r\n        this.year = year;\r\n        this.month = month;\r\n        this.day = day;\r\n    }\r\n\r\n    public int getYear() {\r\n        return year;\r\n    }\r\n\r\n    public void setYear(int year) {\r\n        this.year = year;\r\n    }\r\n\r\n    public int getMonth() {\r\n        return month;\r\n    }\r\n\r\n    public void setMonth(int month) {\r\n        this.month = month;\r\n    }\r\n\r\n    public int getDay() {\r\n        return day;\r\n    }\r\n\r\n    public void setDay(int day) {\r\n        this.day = day;\r\n    }\r\n\r\n    @Override\r\n    public String toString() {\r\n        return \"MyDate{\" +\r\n                \"year=\" + year +\r\n                \", month=\" + month +\r\n                \", day=\" + day +\r\n                '}';\r\n    }\r\n\r\n    @Override\r\n    public int compareTo(Object o) {\r\n        if (o instanceof MyDate){\r\n            MyDate m = (MyDate) o;\r\n\r\n            \/\/\u6bd4\u8f83\u5e74\r\n            int minusYear = this.getYear() - m.getYear();\r\n            if (minusYear != 0){\r\n                return minusYear;\r\n            }\r\n            \/\/\u6bd4\u8f83\u6708\r\n            int minusMouth = this.getMonth() - m.getMonth();\r\n            if (minusMouth != 0){\r\n                return minusMouth;\r\n            }\r\n            \/\/\u6bd4\u8f83\u65e5\r\n            return this.getDay() - m.getDay();\r\n        }\r\n\r\n        throw new RuntimeException(\"\u4f20\u5165\u7684\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\uff01\");\r\n    }\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P546;\r\n\r\nimport org.junit.jupiter.api.Test;\r\n\r\nimport java.util.Comparator;\r\nimport java.util.Iterator;\r\nimport java.util.TreeSet;\r\n\r\n\/**\r\n * \u521b\u5efa\u8be5\u7c7b\u7684 5 \u4e2a\u5bf9\u8c61\uff0c\u5e76\u628a\u8fd9\u4e9b\u5bf9\u8c61\u653e\u5165 TreeSet \u96c6\u5408\u4e2d\uff08\u4e0b\u4e00\u7ae0\uff1aTreeSet \u9700\u4f7f\u7528\u6cdb\u578b\u6765\u5b9a\u4e49\uff09\r\n * \u5206\u522b\u6309\u4ee5\u4e0b\u4e24\u79cd\u65b9\u5f0f\u5bf9\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u6392\u5e8f\uff0c\u5e76\u904d\u5386\u8f93\u51fa\uff1a\r\n *\r\n * 1). \u4f7f Employee \u5b9e\u73b0 Comparable \u63a5\u53e3\uff0c\u5e76\u6309 name \u6392\u5e8f\r\n * 2). \u521b\u5efa TreeSet \u65f6\u4f20\u5165 Comparator \u5bf9\u8c61\uff0c\u6309\u751f\u65e5\u65e5\u671f\u7684\u5148\u540e\u6392\u5e8f\u3002\r\n *\r\n * @author RichieZhang\r\n * @create 2022-10-27 \u4e0b\u5348 3:30\r\n *\/\r\npublic class EmployeeTest {\r\n\r\n    \/\/\u95ee\u9898\u4e8c\uff1a\u6309\u751f\u65e5\u65e5\u671f\u7684\u5148\u540e\u6392\u5e8f\u3002\r\n    @Test\r\n    public void test2(){\r\n\r\n        TreeSet set = new TreeSet(new Comparator() {\r\n            @Override\r\n            public int compare(Object o1, Object o2) {\r\n                if(o1 instanceof Employee &amp;&amp; o2 instanceof Employee){\r\n                    Employee e1 = (Employee) o1;\r\n                    Employee e2 = (Employee) o2;\r\n\r\n                    MyDate b1 = e1.getBirthday();\r\n                    MyDate b2 = e2.getBirthday();\r\n                    \/\/\u65b9\u5f0f\u4e00\uff1a\r\n\/\/                    \/\/\u6bd4\u8f83\u5e74\r\n\/\/                    int minusYear = b1.getYear() - b2.getYear();\r\n\/\/                    if (minusYear != 0){\r\n\/\/                        return minusYear;\r\n\/\/                    }\r\n\/\/                    \/\/\u6bd4\u8f83\u6708\r\n\/\/                    int minusMouth = b1.getMonth() - b2.getMonth();\r\n\/\/                    if (minusMouth != 0){\r\n\/\/                        return minusMouth;\r\n\/\/                    }\r\n\/\/                    \/\/\u6bd4\u8f83\u65e5\r\n\/\/                    return b1.getDay() - b2.getDay();\r\n\r\n                    \/\/\u65b9\u5f0f\u4e8c\uff1a\r\n                    return b1.compareTo(b2);\r\n                }\r\n\/\/                return 0;\r\n                throw new RuntimeException(\"\u4f20\u5165\u7684\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\uff01\");\r\n            }\r\n        });\r\n\r\n        Employee e1 = new Employee(\"liudehua\",55,new MyDate(1965,5,4));\r\n        Employee e2 = new Employee(\"zhangxueyou\",43,new MyDate(1987,5,4));\r\n        Employee e3 = new Employee(\"guofucheng\",44,new MyDate(1987,5,9));\r\n        Employee e4 = new Employee(\"liming\",51,new MyDate(1954,8,12));\r\n        Employee e5 = new Employee(\"liangchaowei\",21,new MyDate(1978,12,4));\r\n\r\n        set.add(e1);\r\n        set.add(e2);\r\n        set.add(e3);\r\n        set.add(e4);\r\n        set.add(e5);\r\n\r\n        Iterator iterator = set.iterator();\r\n        while (iterator.hasNext()){\r\n            System.out.println(iterator.next());\r\n        }\r\n    }\r\n\r\n    \/\/\u95ee\u9898\u4e00\uff1a\u4f7f\u7528\u81ea\u7136\u6392\u5e8f\r\n    @Test\r\n    public void test1(){\r\n\r\n        TreeSet set = new TreeSet();\r\n\r\n        Employee e1 = new Employee(\"liudehua\",55,new MyDate(1965,5,4));\r\n        Employee e2 = new Employee(\"zhangxueyou\",43,new MyDate(1987,5,4));\r\n        Employee e3 = new Employee(\"guofucheng\",44,new MyDate(1987,5,9));\r\n        Employee e4 = new Employee(\"liming\",51,new MyDate(1954,8,12));\r\n        Employee e5 = new Employee(\"liangchaowei\",21,new MyDate(1978,12,4));\r\n\r\n        set.add(e1);\r\n        set.add(e2);\r\n        set.add(e3);\r\n        set.add(e4);\r\n        set.add(e5);\r\n\r\n        Iterator iterator = set.iterator();\r\n        while (iterator.hasNext()){\r\n            System.out.println(iterator.next());\r\n        }\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-1226","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\/1226"}],"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=1226"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1226\/revisions"}],"predecessor-version":[{"id":1227,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1226\/revisions\/1227"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1226"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}