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package snippet;import java.util.Arrays;import java.util.Comparator;public class ComparatorUse {
       public static void main(String[] args) {        Student[] persons = new Student[5];        persons[0] = new Student("tom", 1, 88, 45);        persons[1] = new Student("jack", 6, 80, 12);        persons[2] = new Student("bill", 4, 68, 21);        persons[3] = new Student("kandy", 2, 98, 34);        persons[4] = new Student("lily", 5, 94, 20);        System.out.println("排序前的数据：");        for (Student student : persons) {            System.out.println(student);        }        //这里是关键        Arrays.sort(persons, new SortByNumber());        System.out.println("根据学生编号由低到高排序：");        for (Student student : persons) {            System.out.println(student);        }        //这里是关键        Arrays.sort(persons, new SortByScore());        System.out.println("根据学生成绩由高到低排序：");        for (Student student : persons) {            System.out.println(student);        }    }    //这里是关键    static class SortByNumber implements Comparator
   
     {
           @Override        public int compare(Student o1, Student o2) {            return o1.getNumber() - o2.getNumber();        }    }    //这里是关键    static class SortByScore implements Comparator
    
      {
           @Override        public int compare(Student o1, Student o2) {            return o2.getScore() - o1.getScore();        }    }}
    
   

输出：

排序前的数据：Student[name:tom,age:45,number:1,score:88]Student[name:jack,age:12,number:6,score:80]Student[name:bill,age:21,number:4,score:68]Student[name:kandy,age:34,number:2,score:98]Student[name:lily,age:20,number:5,score:94]根据学生编号由低到高排序：Student[name:tom,age:45,number:1,score:88]Student[name:kandy,age:34,number:2,score:98]Student[name:bill,age:21,number:4,score:68]Student[name:lily,age:20,number:5,score:94]Student[name:jack,age:12,number:6,score:80]根据学生成绩由高到低排序：Student[name:kandy,age:34,number:2,score:98]Student[name:lily,age:20,number:5,score:94]Student[name:tom,age:45,number:1,score:88]Student[name:jack,age:12,number:6,score:80]Student[name:bill,age:21,number:4,score:68]

student类：

package snippet;class Student {   private String name;   private int number;   private int score;   private int age;   public Student(String name,int number,int score,int age){       this.name = name;       this.number = number;       this.score = score;       this.age = age;   }   @Override   public String toString() {             return "Student[name:"+name+",age:"+age+",number:"+number+",score:"+score+"]";   }   public String getName() {       return name;   }   public void setName(String name) {       this.name = name;   }   public int getNumber() {       return number;   }   public void setNumber(int number) {       this.number = number;   }   public int getScore() {       return score;   }   public void setScore(int score) {       this.score = score;   }   public int getAge() {       return age;   }   public void setAge(int age) {       this.age = age;   }}

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