{"id":408,"date":"2023-02-22T00:27:20","date_gmt":"2023-04-11T11:08:28","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e7%a4%ba%e4%be%8b%e4%b8%ad%e7%9a%84comparable%e5%92%8ccomparator%e5%8f%af%e4%bb%a5%e6%af%94%e8%be%83%e3%80%82\/"},"modified":"2025-08-02T05:45:35","modified_gmt":"2025-08-01T21:45:35","slug":"java%e7%a4%ba%e4%be%8b%e4%b8%ad%e7%9a%84comparable%e5%92%8ccomparator%e5%8f%af%e4%bb%a5%e6%af%94%e8%be%83%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%a4%ba%e4%be%8b%e4%b8%ad%e7%9a%84comparable%e5%92%8ccomparator%e5%8f%af%e4%bb%a5%e6%af%94%e8%be%83%e3%80%82\/","title":{"rendered":"Java\u4e2dComparable\u548cComparator\u63a5\u53e3\u7684\u533a\u522b\u4e0e\u7528\u6cd5\u8be6\u89e3"},"content":{"rendered":"

Java\u4e2d\u7684Comparable\u548cComparator\u63a5\u53e3\u5bf9\u4e8e\u5bf9\u8c61\u96c6\u5408\u7684\u6392\u5e8f\u64cd\u4f5c\u975e\u5e38\u6709\u7528\u3002Java\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5185\u7f6e\u65b9\u6cd5\u6765\u5bf9\u539f\u59cb\u7c7b\u578b\u6570\u7ec4\u3001\u5305\u88c5\u7c7b\u6570\u7ec4\u6216\u5217\u8868\u8fdb\u884c\u6392\u5e8f\u3002\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u9996\u5148\u5b66\u4e60\u5982\u4f55\u5bf9\u539f\u59cb\u7c7b\u578b\u548c\u5305\u88c5\u7c7b\u7684\u6570\u7ec4\/\u5217\u8868\u8fdb\u884c\u6392\u5e8f\uff0c\u7136\u540e\u4f7f\u7528java.lang.Comparable\u548cjava.util.Comparator\u63a5\u53e3\u6765\u5bf9\u81ea\u5b9a\u4e49\u7c7b\u7684\u6570\u7ec4\/\u5217\u8868\u8fdb\u884c\u6392\u5e8f\u3002\u8ba9\u6211\u4eec\u901a\u8fc7\u7b80\u5355\u7684\u7a0b\u5e8f\u793a\u4f8b\u6765\u4e86\u89e3\u5982\u4f55\u5bf9\u539f\u59cb\u7c7b\u578b\u6216\u5bf9\u8c61\u6570\u7ec4\u548c\u5217\u8868\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n

package com.Olivia.sort;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.Arrays;\r\nimport java.util.Collections;\r\nimport java.util.List;\r\n\r\npublic class JavaObjectSorting {\r\n\r\n    \/**\r\n     * \u8fd9\u4e2a\u7c7b\u5c55\u793a\u4e86\u5982\u4f55\u6392\u5e8f\u539f\u59cb\u7c7b\u578b\u6570\u7ec4\uff0c\r\n     * \u5305\u88c5\u7c7b\u5bf9\u8c61\u6570\u7ec4\r\n     * @param args\r\n     *\/\r\n    public static void main(String[] args) {\r\n        \/\/\u6392\u5e8f\u539f\u59cb\u7c7b\u578b\u6570\u7ec4\uff0c\u5982\u6574\u578b\u6570\u7ec4\r\n        int[] intArr = {5,9,1,10};\r\n        Arrays.sort(intArr);\r\n        System.out.println(Arrays.toString(intArr));\r\n        \r\n        \/\/\u6392\u5e8f\u5b57\u7b26\u4e32\u6570\u7ec4\r\n        String[] strArr = {\"A\", \"C\", \"B\", \"Z\", \"E\"};\r\n        Arrays.sort(strArr);\r\n        System.out.println(Arrays.toString(strArr));\r\n        \r\n        \/\/\u6392\u5e8f\u5305\u88c5\u7c7b\u5bf9\u8c61\u7684\u5217\u8868\r\n        List<String> strList = new ArrayList<String>();\r\n        strList.add(\"A\");\r\n        strList.add(\"C\");\r\n        strList.add(\"B\");\r\n        strList.add(\"Z\");\r\n        strList.add(\"E\");\r\n        Collections.sort(strList);\r\n        for(String str: strList) System.out.print(\" \"+str);\r\n    }\r\n}\r\n<\/code><\/pre>\n
\u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n
[1, 5, 9, 10]\r\n[A, B, C, E, Z]\r\n A B C E Z\r\n<\/code><\/pre>\n
\u73b0\u5728\u8ba9\u6211\u4eec\u6765\u5c1d\u8bd5\u5bf9\u4e00\u4e2a\u5bf9\u8c61\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n
package com.Olivia.sort;\r\n\r\npublic class Employee {\r\n\r\n    private int id;\r\n    private String name;\r\n    private int age;\r\n    private long salary;\r\n\r\n    public int getId() {\r\n        return id;\r\n    }\r\n\r\n    public String getName() {\r\n        return name;\r\n    }\r\n\r\n    public int getAge() {\r\n        return age;\r\n    }\r\n\r\n    public long getSalary() {\r\n        return salary;\r\n    }\r\n\r\n    public Employee(int id, String name, int age, int salary) {\r\n        this.id = id;\r\n        this.name = name;\r\n        this.age = age;\r\n        this.salary = salary;\r\n    }\r\n\r\n    @Override\r\n    \/\/\u91cd\u5199\u6b64\u65b9\u6cd5\u4ee5\u4fbf\u6253\u5370\u5458\u5de5\u5bf9\u8c61\u7684\u53cb\u597d\u4fe1\u606f\r\n    public String toString() {\r\n        return \"[id=\" + this.id + \", name=\" + this.name + \", age=\" + this.age + \", salary=\" +\r\n                this.salary + \"]\";\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n
\u8fd9\u662f\u6211\u7528\u6765\u5bf9\u5458\u5de5\u5bf9\u8c61\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\u7684\u4ee3\u7801\u3002<\/p>\n
\/\/\u6392\u5e8f\u5bf9\u8c61\u6570\u7ec4\r\nEmployee[] empArr = new Employee[4];\r\nempArr[0] = new Employee(10, \"Mikey\", 25, 10000);\r\nempArr[1] = new Employee(20, \"Arun\", 29, 20000);\r\nempArr[2] = new Employee(5, \"Lisa\", 35, 5000);\r\nempArr[3] = new Employee(1, \"Pankaj\", 32, 50000);\r\n\r\n\/\/\u4f7f\u7528Comparable\u63a5\u53e3\u5b9e\u73b0\u6765\u6392\u5e8f\u5458\u5de5\u6570\u7ec4\r\nArrays.sort(empArr);\r\nSystem.out.println(\"\u5458\u5de5\u5217\u8868\u7684\u9ed8\u8ba4\u6392\u5e8f:\\n\"+Arrays.toString(empArr));\r\n<\/code><\/pre>\n
\u5f53\u6211\u5c1d\u8bd5\u8fd0\u884c\u8fd9\u6bb5\u4ee3\u7801\u65f6\uff0c\u5b83\u629b\u51fa\u4e86\u4ee5\u4e0b\u8fd0\u884c\u65f6\u5f02\u5e38\u3002<\/p>\n
Exception in thread \"main\" java.lang.ClassCastException: com.Olivia.sort.Employee cannot be cast to java.lang.Comparable\r\n\tat java.util.ComparableTimSort.countRunAndMakeAscending(ComparableTimSort.java:290)\r\n\tat java.util.ComparableTimSort.sort(ComparableTimSort.java:157)\r\n\tat java.util.ComparableTimSort.sort(ComparableTimSort.java:146)\r\n\tat java.util.Arrays.sort(Arrays.java:472)\r\n\tat com.Olivia.sort.JavaSorting.main(JavaSorting.java:41)\r\n<\/code><\/pre>\n
Comparable\u4e0eComparator\u63a5\u53e3<\/h2>\n
\u8fd9\u662f\u6587\u7ae0\u300aJava\u793a\u4f8b\u4e2d\u7684Comparable\u548cComparator\u53ef\u4ee5\u6bd4\u8f83\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51714\u90e8\u5206\uff09\u3002<\/p>\n
Java\u63d0\u4f9b\u4e86Comparable\u63a5\u53e3<\/strong>\uff0c\u5982\u679c\u6211\u4eec\u60f3\u8981\u4f7f\u7528Arrays\u6216Collections\u7684\u6392\u5e8f\u65b9\u6cd5\uff0c\u5c31\u9700\u8981\u5728\u81ea\u5b9a\u4e49\u7c7b\u4e2d\u5b9e\u73b0\u8fd9\u4e2a\u63a5\u53e3\u3002Comparable\u63a5\u53e3\u5177\u6709compareTo(T obj)<\/strong>\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u4f1a\u88ab\u6392\u5e8f\u65b9\u6cd5\u4f7f\u7528\uff0c\u60a8\u53ef\u4ee5\u67e5\u770b\u4efb\u4f55\u5305\u88c5\u7c7b\u3001\u5b57\u7b26\u4e32\u6216\u65e5\u671f\u7c7b\u6765\u786e\u8ba4\u8fd9\u4e00\u70b9\u3002\u6211\u4eec\u5e94\u8be5\u4ee5\u8fd9\u6837\u4e00\u79cd\u65b9\u5f0f\u91cd\u5199\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u4f7f\u5176\u8fd4\u56de\u4e00\u4e2a\u8d1f\u6574\u6570\u3001\u96f6\u6216\u6b63\u6574\u6570\uff0c\u4ee5\u6307\u793a”this”\u5bf9\u8c61\u662f\u5426\u5c0f\u4e8e\u3001\u7b49\u4e8e\u6216\u5927\u4e8e\u4f20\u9012\u7684\u5bf9\u8c61\u3002\u5728Employee\u7c7b\u4e2d\u5b9e\u73b0Comparable\u63a5\u53e3\u4e4b\u540e\uff0c\u5373\u53ef\u5f97\u5230\u5982\u4e0b\u7684Employee\u7c7b\u3002<\/p>\n
package com.Olivia.sort;\r\n\r\nimport java.util.Comparator;\r\n\r\npublic class Employee implements Comparable<Employee> {\r\n\r\n    private int id;\r\n    private String name;\r\n    private int age;\r\n    private long salary;\r\n\r\n    public int getId() {\r\n        return id;\r\n    }\r\n\r\n    public String getName() {\r\n        return name;\r\n    }\r\n\r\n    public int getAge() {\r\n        return age;\r\n    }\r\n\r\n    public long getSalary() {\r\n        return salary;\r\n    }\r\n\r\n    public Employee(int id, String name, int age, int salary) {\r\n        this.id = id;\r\n        this.name = name;\r\n        this.age = age;\r\n        this.salary = salary;\r\n    }\r\n\r\n    @Override\r\n    public int compareTo(Employee emp) {\r\n        \/\/\u8ba9\u6211\u4eec\u6839\u636eid\u5bf9\u5458\u5de5\u8fdb\u884c\u5347\u5e8f\u6392\u5e8f\r\n        \/\/\u5f53\u6b64\u5458\u5de5id\u5c0f\u4e8e\u3001\u7b49\u4e8e\u6216\u5927\u4e8e\u6307\u5b9a\u5bf9\u8c61\u65f6\uff0c\r\n        \/\/\u8fd4\u56de\u8d1f\u6574\u6570\u3001\u96f6\u6216\u6b63\u6574\u6570\r\n        return (this.id - emp.id);\r\n    }\r\n\r\n    @Override\r\n    \/\/\u8fd9\u662f\u6253\u5370\u5458\u5de5\u53cb\u597d\u4fe1\u606f\u6240\u5fc5\u9700\u7684\r\n    public String toString() {\r\n        return \"[id=\" + this.id + \", name=\" + this.name + \", age=\" + this.age + \", salary=\" +\r\n                this.salary + \"]\";\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n
\u73b0\u5728\u5f53\u6211\u4eec\u6267\u884c\u4e0a\u9762\u7684\u4ee3\u7801\u7247\u6bb5\u5bf9\u96c7\u5458\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\u5e76\u6253\u5370\u65f6\uff0c\u4ee5\u4e0b\u662f\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n
Employees\u5217\u8868\u7684\u9ed8\u8ba4\u6392\u5e8f\uff1a\r\n[[id=1, name=Pankaj, age=32, salary=50000], [id=5, name=Lisa, age=35, salary=5000], [id=10, name=Mikey, age=25, salary=10000], [id=20, name=Arun, age=29, salary=20000]]\r\n<\/code><\/pre>\n
\u6b63\u5982\u60a8\u6240\u770b\u5230\u7684\uff0cEmployees\u6570\u7ec4\u6309\u7167ID\u5347\u5e8f\u6392\u5e8f\u3002\u4f46\u5728\u5927\u591a\u6570\u5b9e\u9645\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u5e0c\u671b\u6839\u636e\u4e0d\u540c\u7684\u53c2\u6570\u8fdb\u884c\u6392\u5e8f\u3002\u4f8b\u5982\uff0c\u4f5c\u4e3aCEO\uff0c\u6211\u5e0c\u671b\u6839\u636e\u85aa\u8d44\u5bf9\u5458\u5de5\u8fdb\u884c\u6392\u5e8f\uff0c\u800cHR\u5e0c\u671b\u6839\u636e\u5e74\u9f84\u8fdb\u884c\u6392\u5e8f\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528Java\u7684Comparator\u63a5\u53e3<\/strong>\uff0c\u56e0\u4e3aComparable.compareTo(Object o)<\/strong>\u65b9\u6cd5\u7684\u5b9e\u73b0\u53ea\u80fd\u63d0\u4f9b\u9ed8\u8ba4\u6392\u5e8f\uff0c\u800c\u4e14\u6211\u4eec\u65e0\u6cd5\u52a8\u6001\u5730\u6539\u53d8\u5b83\u3002\u800c\u4f7f\u7528Comparator\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a\u4e0d\u540c\u7684\u6392\u5e8f\u65b9\u5f0f\uff0c\u7136\u540e\u6839\u636e\u9700\u6c42\u9009\u62e9\u9002\u5f53\u7684\u6392\u5e8f\u65b9\u6cd5\u3002<\/p>\n
Java\u7684\u6bd4\u8f83\u5668\uff08Comparator\uff09<\/h2>\n
\u9700\u8981\u5b9e\u73b0Comparator\u63a5\u53e3\u7684compare(Object o1, Object o2)\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u63a5\u53d7\u4e24\u4e2aObject\u53c2\u6570\u3002\u5b83\u5e94\u8be5\u8fd9\u6837\u5b9e\u73b0\uff1a\u5982\u679c\u7b2c\u4e00\u4e2a\u53c2\u6570\u5c0f\u4e8e\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u8fd4\u56de\u8d1f\u6574\u6570\uff1b\u5982\u679c\u5b83\u4eec\u76f8\u7b49\uff0c\u8fd4\u56de\u96f6\uff1b\u5982\u679c\u7b2c\u4e00\u4e2a\u53c2\u6570\u5927\u4e8e\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u8fd4\u56de\u6b63\u6574\u6570\u3002Comparable\u548cComparator\u63a5\u53e3\u4f7f\u7528\u6cdb\u578b\u7528\u4e8e\u7f16\u8bd1\u65f6\u7c7b\u578b\u68c0\u67e5\uff0c\u53ef\u4ee5\u4e86\u89e3\u66f4\u591a\u5173\u4e8eJava\u6cdb\u578b\u7684\u77e5\u8bc6\u3002\u4e0b\u9762\u662f\u5982\u4f55\u5728Employee\u7c7b\u4e2d\u521b\u5efa\u4e0d\u540c\u7684Comparator\u5b9e\u73b0\u7684\u65b9\u6cd5\u3002<\/p>\n
\/**\r\n     * \u6309\u85aa\u8d44\u6392\u5e8f\u5458\u5de5\u5217\u8868\u6216\u6570\u7ec4\u7684\u6bd4\u8f83\u5668\r\n     *\/\r\n    public static Comparator<Employee> SalaryComparator = new Comparator<Employee>() {\r\n\r\n        @Override\r\n        public int compare(Employee e1, Employee e2) {\r\n            return (int) (e1.getSalary() - e2.getSalary());\r\n        }\r\n    };\r\n\r\n    \/**\r\n     * \u6309\u5e74\u9f84\u6392\u5e8f\u5458\u5de5\u5217\u8868\u6216\u6570\u7ec4\u7684\u6bd4\u8f83\u5668\r\n     *\/\r\n    public static Comparator<Employee> AgeComparator = new Comparator<Employee>() {\r\n\r\n        @Override\r\n        public int compare(Employee e1, Employee e2) {\r\n            return e1.getAge() - e2.getAge();\r\n        }\r\n    };\r\n\r\n    \/**\r\n     * \u6309\u59d3\u540d\u6392\u5e8f\u5458\u5de5\u5217\u8868\u6216\u6570\u7ec4\u7684\u6bd4\u8f83\u5668\r\n     *\/\r\n    public static Comparator<Employee> NameComparator = new Comparator<Employee>() {\r\n\r\n        @Override\r\n        public int compare(Employee e1, Employee e2) {\r\n            return e1.getName().compareTo(e2.getName());\r\n        }\r\n    };\r\n<\/code><\/pre>\n
\u4e0a\u8ff0\u6240\u6709\u7684Comparator\u63a5\u53e3\u7684\u5b9e\u73b0\u90fd\u662f\u533f\u540d\u7c7b\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u6bd4\u8f83\u5668\u5c06\u53c2\u6570\u4f20\u9012\u7ed9Arrays\u548cCollections\u7c7b\u7684\u6392\u5e8f\u51fd\u6570\u3002<\/p>\n
\/\/\u4f7f\u7528\u6bd4\u8f83\u5668\u6309\u85aa\u8d44\u6392\u5e8f\u5458\u5de5\u6570\u7ec4\r\nArrays.sort(empArr, Employee.SalaryComparator);\r\nSystem.out.println(\"\u6309\u85aa\u8d44\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\\n\"+Arrays.toString(empArr));\r\n\r\n\/\/\u4f7f\u7528\u6bd4\u8f83\u5668\u6309\u5e74\u9f84\u6392\u5e8f\u5458\u5de5\u6570\u7ec4\r\nArrays.sort(empArr, Employee.AgeComparator);\r\nSystem.out.println(\"\u6309\u5e74\u9f84\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\\n\"+Arrays.toString(empArr));\r\n\r\n\/\/\u4f7f\u7528\u6bd4\u8f83\u5668\u6309\u59d3\u540d\u6392\u5e8f\u5458\u5de5\u6570\u7ec4\r\nArrays.sort(empArr, Employee.NameComparator);\r\nSystem.out.println(\"\u6309\u59d3\u540d\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\\n\"+Arrays.toString(empArr));\r\n<\/code><\/pre>\n
\u4ee5\u4e0b\u662f\u4e0a\u8ff0\u4ee3\u7801\u7247\u6bb5\u7684\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n
\u6309\u85aa\u8d44\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\r\n[[id=5, name=Lisa, age=35, salary=5000], [id=10, name=Mikey, age=25, salary=10000], [id=20, name=Arun, age=29, salary=20000], [id=1, name=Pankaj, age=32, salary=50000]]\r\n\u6309\u5e74\u9f84\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\r\n[[id=10, name=Mikey, age=25, salary=10000], [id=20, name=Arun, age=29, salary=20000], [id=1, name=Pankaj, age=32, salary=50000], [id=5, name=Lisa, age=35, salary=5000]]\r\n\u6309\u59d3\u540d\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\r\n[[id=20, name=Arun, age=29, salary=20000], [id=5, name=Lisa, age=35, salary=5000], [id=10, name=Mikey, age=25, salary=10000], [id=1, name=Pankaj, age=32, salary=50000]]\r\n<\/code><\/pre>\n
\u6240\u4ee5\u73b0\u5728\u6211\u4eec\u77e5\u9053\u5982\u679c\u6211\u4eec\u60f3\u8981\u5bf9Java\u5bf9\u8c61\u6570\u7ec4\u6216\u5217\u8868\u8fdb\u884c\u6392\u5e8f\uff0c\u6211\u4eec\u9700\u8981\u5b9e\u73b0Java\u7684Comparable\u63a5\u53e3\u6765\u63d0\u4f9b\u9ed8\u8ba4\u6392\u5e8f\uff0c\u800c\u4e14\u6211\u4eec\u5e94\u8be5\u5b9e\u73b0Java\u7684Comparator\u63a5\u53e3\u6765\u63d0\u4f9b\u4e0d\u540c\u7684\u6392\u5e8f\u65b9\u5f0f\u3002\u6211\u4eec\u8fd8\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u5355\u72ec\u7684\u7c7b\u6765\u5b9e\u73b0Comparator\u63a5\u53e3\uff0c\u7136\u540e\u4f7f\u7528\u5b83\u3002\u8fd9\u91cc\u662f\u6211\u4eec\u6700\u7ec8\u7684\u7c7b\uff0c\u89e3\u91ca\u4e86Java\u4e2d\u7684Comparable\u548cComparator\u3002<\/p>\n
package com.Olivia.sort;\r\n\r\nimport java.util.Comparator;\r\n\r\npublic class Employee implements Comparable<Employee> {\r\n\r\n    private int id;\r\n    private String name;\r\n    private int age;\r\n    private long salary;\r\n\r\n    public int getId() {\r\n        return id;\r\n    }\r\n\r\n    public String getName() {\r\n        return name;\r\n    }\r\n\r\n    public int getAge() {\r\n        return age;\r\n    }\r\n\r\n    public long getSalary() {\r\n        return salary;\r\n    }\r\n\r\n    public Employee(int id, String name, int age, int salary) {\r\n        this.id = id;\r\n        this.name = name;\r\n        this.age = age;\r\n        this.salary = salary;\r\n    }\r\n\r\n    @Override\r\n    public int compareTo(Employee emp) {\r\n        \/\/\u8ba9\u6211\u4eec\u6309\u5347\u5e8f\u5bf9\u5458\u5de5ID\u8fdb\u884c\u6392\u5e8f\r\n        \/\/\u5f53\u6b64\u5458\u5de5ID\u5c0f\u4e8e\u3001\u7b49\u4e8e\u6216\u5927\u4e8e\u6307\u5b9a\u5bf9\u8c61\u65f6\uff0c\r\n        \/\/\u8fd4\u56de\u8d1f\u6574\u6570\u3001\u96f6\u6216\u6b63\u6574\u6570\u3002\r\n        return (this.id - emp.id);\r\n    }\r\n\r\n    @Override\r\n    \/\/\u8fd9\u662f\u6253\u5370\u5458\u5de5\u53cb\u597d\u4fe1\u606f\u6240\u5fc5\u9700\u7684\r\n    public String toString() {\r\n        return \"[id=\" + this.id + \", name=\" + this.name + \", age=\" + this.age + \", salary=\" +\r\n                this.salary + \"]\";\r\n    }\r\n\r\n    \/**\r\n     * \u6309\u85aa\u8d44\u6392\u5e8f\u5458\u5de5\u5217\u8868\u6216\u6570\u7ec4\u7684\u6bd4\u8f83\u5668\r\n     *\/\r\n    public static Comparator<Employee> SalaryComparator = new Comparator<Employee>() {\r\n\r\n        @Override\r\n        public int compare(Employee e1, Employee e2) {\r\n            return (int) (e1.getSalary() - e2.getSalary());\r\n        }\r\n    };\r\n\r\n    \/**\r\n     * \u6309\u5e74\u9f84\u6392\u5e8f\u5458\u5de5\u5217\u8868\u6216\u6570\u7ec4\u7684\u6bd4\u8f83\u5668\r\n     *\/\r\n    public static Comparator<Employee> AgeComparator = new Comparator<Employee>() {\r\n\r\n        @Override\r\n        public int compare(Employee e1, Employee e2) {\r\n            return e1.getAge() - e2.getAge();\r\n        }\r\n    };\r\n\r\n    \/**\r\n     * \u6309\u59d3\u540d\u6392\u5e8f\u5458\u5de5\u5217\u8868\u6216\u6570\u7ec4\u7684\u6bd4\u8f83\u5668\r\n     *\/\r\n    public static Comparator<Employee> NameComparator = new Comparator<Employee>() {\r\n\r\n        @Override\r\n        public int compare(Employee e1, Employee e2) {\r\n            return e1.getName().compareTo(e2.getName());\r\n        }\r\n    };\r\n}\r\n<\/code><\/pre>\n
\u4ee5\u4e0b\u662fComparator\u63a5\u53e3\u7684\u5355\u72ec\u7c7b\u5b9e\u73b0\uff0c\u5b83\u5c06\u9996\u5148\u6bd4\u8f83\u4e24\u4e2a\u5458\u5de5\u5bf9\u8c61\u7684ID\uff0c\u5982\u679c\u76f8\u540c\uff0c\u5219\u518d\u6bd4\u8f83\u5b83\u4eec\u7684\u59d3\u540d\u3002<\/p>\n
package com.Olivia.sort;\r\n\r\nimport java.util.Comparator;\r\n\r\npublic class EmployeeComparatorByIdAndName implements Comparator<Employee> {\r\n\r\n    @Override\r\n    public int compare(Employee o1, Employee o2) {\r\n        int flag = o1.getId() - o2.getId();\r\n        if(flag==0) flag = o1.getName().compareTo(o2.getName());\r\n        return flag;\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n
\u8fd9\u662f\u6d4b\u8bd5\u7c7b\uff0c\u6211\u4eec\u5728java\u4e2d\u4f7f\u7528Comparable\u548cComparator\u7684\u4e0d\u540c\u65b9\u5f0f\u6765\u5bf9\u5bf9\u8c61\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n
package com.Olivia.sort;\r\n\r\nimport java.util.Arrays;\r\n\r\npublic class JavaObjectSorting {\r\n\r\n    \/**\r\n     * \u8fd9\u4e2a\u7c7b\u5c55\u793a\u4e86\u5982\u4f55\u901a\u8fc7\u5b9e\u73b0Comparable\u548cComparator\u63a5\u53e3\r\n     * \u6765\u5bf9\u81ea\u5b9a\u4e49\u5bf9\u8c61\u6570\u7ec4\/\u5217\u8868\u8fdb\u884c\u6392\u5e8f\r\n     * @param args\r\n     *\/\r\n    public static void main(String[] args) {\r\n\r\n        \/\/\u6392\u5e8f\u81ea\u5b9a\u4e49\u5bf9\u8c61\u6570\u7ec4\r\n        Employee[] empArr = new Employee[4];\r\n        empArr[0] = new Employee(10, \"Mikey\", 25, 10000);\r\n        empArr[1] = new Employee(20, \"Arun\", 29, 20000);\r\n        empArr[2] = new Employee(5, \"Lisa\", 35, 5000);\r\n        empArr[3] = new Employee(1, \"Pankaj\", 32, 50000);\r\n        \r\n        \/\/\u4f7f\u7528Comparable\u63a5\u53e3\u5b9e\u73b0\u6392\u5e8f\u5458\u5de5\u6570\u7ec4\r\n        Arrays.sort(empArr);\r\n        System.out.println(\"\u5458\u5de5\u5217\u8868\u7684\u9ed8\u8ba4\u6392\u5e8f\uff1a\\n\"+Arrays.toString(empArr));\r\n        \r\n        \/\/\u4f7f\u7528\u6bd4\u8f83\u5668\u6309\u85aa\u8d44\u6392\u5e8f\u5458\u5de5\u6570\u7ec4\r\n        Arrays.sort(empArr, Employee.SalaryComparator);\r\n        System.out.println(\"\u6309\u85aa\u8d44\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\\n\"+Arrays.toString(empArr));\r\n        \r\n        \/\/\u4f7f\u7528\u6bd4\u8f83\u5668\u6309\u5e74\u9f84\u6392\u5e8f\u5458\u5de5\u6570\u7ec4\r\n        Arrays.sort(empArr, Employee.AgeComparator);\r\n        System.out.println(\"\u6309\u5e74\u9f84\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\\n\"+Arrays.toString(empArr));\r\n        \r\n        \/\/\u4f7f\u7528\u6bd4\u8f83\u5668\u6309\u59d3\u540d\u6392\u5e8f\u5458\u5de5\u6570\u7ec4\r\n        Arrays.sort(empArr, Employee.NameComparator);\r\n        System.out.println(\"\u6309\u59d3\u540d\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\\n\"+Arrays.toString(empArr));\r\n        \r\n        \/\/\u4f7f\u7528\u6bd4\u8f83\u5668\u7c7b\u6309ID\u548c\u59d3\u540d\u6392\u5e8f\u5458\u5de5\u5217\u8868\r\n        empArr[0] = new Employee(1, \"Mikey\", 25, 10000);\r\n        Arrays.sort(empArr, new EmployeeComparatorByIdAndName());\r\n        System.out.println(\"\u6309ID\u548c\u59d3\u540d\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\\n\"+Arrays.toString(empArr));\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n
\u4ee5\u4e0b\u662f\u4e0a\u8ff0\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n
\u5458\u5de5\u5217\u8868\u7684\u9ed8\u8ba4\u6392\u5e8f\uff1a\r\n[[id=1, name=Pankaj, age=32, salary=50000], [id=5, name=Lisa, age=35, salary=5000], [id=10, name=Mikey, age=25, salary=10000], [id=20, name=Arun, age=29, salary=20000]]\r\n\u6309\u85aa\u8d44\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\r\n[[id=5, name=Lisa, age=35, salary=5000], [id=10, name=Mikey, age=25, salary=10000], [id=20, name=Arun, age=29, salary=20000], [id=1, name=Pankaj, age=32, salary=50000]]\r\n\u6309\u5e74\u9f84\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\r\n[[id=10, name=Mikey, age=25, salary=10000], [id=20, name=Arun, age=29, salary=20000], [id=1, name=Pankaj, age=32, salary=50000], [id=5, name=Lisa, age=35, salary=5000]]\r\n\u6309\u59d3\u540d\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\r\n[[id=20, name=Arun, age=29, salary=20000], [id=5, name=Lisa, age=35, salary=5000], [id=10, name=Mikey, age=25, salary=10000], [id=1, name=Pankaj, age=32, salary=50000]]\r\n\u6309ID\u548c\u59d3\u540d\u6392\u5e8f\u7684\u5458\u5de5\u5217\u8868\uff1a\r\n[[id=1, name=Mikey, age=25, salary=10000], [id=1, name=Pankaj, age=32, salary=50000], [id=5, name=Lisa, age=35, salary=5000], [id=10, name=Mikey, age=25, salary=10000]]\r\n<\/code><\/pre>\n
java.lang.Comparable\u548cjava.util.Comparator\u662f\u5f3a\u5927\u7684\u63a5\u53e3\uff0c\u53ef\u7528\u4e8e\u5728Java\u4e2d\u63d0\u4f9b\u5bf9\u8c61\u7684\u6392\u5e8f\u3002<\/p>\n
\u53ef\u6bd4\u6027\u4e0e\u6bd4\u8f83\u5668<\/h2>\n
    \n
  1. \u53ef\u6bd4\u5bf9\u63a5\u53e3\u53ef\u7528\u4e8e\u63d0\u4f9b\u5355\u4e00\u7684\u6392\u5e8f\u65b9\u5f0f\uff0c\u800c\u6bd4\u8f83\u5668\u63a5\u53e3\u7528\u4e8e\u63d0\u4f9b\u4e0d\u540c\u7684\u6392\u5e8f\u65b9\u5f0f\u3002<\/li>\n
  2. \u4f7f\u7528\u53ef\u6bd4\u5bf9\u63a5\u53e3\uff0c\u7c7b\u9700\u8981\u5b9e\u73b0\u5b83\uff0c\u800c\u4f7f\u7528\u6bd4\u8f83\u5668\u4e0d\u9700\u8981\u5bf9\u7c7b\u8fdb\u884c\u4efb\u4f55\u66f4\u6539\u3002<\/li>\n
  3. \u53ef\u6bd4\u5bf9\u63a5\u53e3\u5728java.lang\u5305\u4e2d\uff0c\u800c\u6bd4\u8f83\u5668\u63a5\u53e3\u5728java.util\u5305\u4e2d\u3002<\/li>\n
  4. \u5bf9\u4e8e\u4f7f\u7528\u53ef\u6bd4\u5bf9\u63a5\u53e3\uff0c\u6211\u4eec\u4e0d\u9700\u8981\u5728\u5ba2\u6237\u7aef\u4ee3\u7801\u4e2d\u8fdb\u884c\u4efb\u4f55\u66f4\u6539\uff0cArrays.sort()\u6216Collection.sort()\u65b9\u6cd5\u4f1a\u81ea\u52a8\u4f7f\u7528\u7c7b\u7684compareTo()\u65b9\u6cd5\u3002\u5bf9\u4e8e\u6bd4\u8f83\u5668\uff0c\u5ba2\u6237\u7aef\u9700\u8981\u63d0\u4f9b\u6bd4\u8f83\u5668\u7c7b\u6765\u5728compare()\u65b9\u6cd5\u4e2d\u4f7f\u7528\u3002<\/li>\n<\/ol>\n
    \u4f60\u77e5\u9053Collections.sort()\u65b9\u6cd5\u662f\u57fa\u4e8e\u7b56\u7565\u6a21\u5f0f\u7684\u5417\uff1f<\/p>\n
    \u4f60\u53ef\u4ee5\u4ece\u6211\u4eec\u7684GitHub\u5b58\u50a8\u5e93\u4e2d\u83b7\u53d6\u5b8c\u6574\u7684\u4ee3\u7801\u548c\u66f4\u591aJava\u6838\u5fc3\u793a\u4f8b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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