一、创建Person类
 1 public class Person {//应该卸载Test里面
 2     private int card ;//身份证号
 3     private String name;//姓名
 4     private int age;//年龄
 5     public Person() {
 6         super();
 7     }
 8     public Person(int card, String name, int age) {
 9         super();
10         this.card = card;
11         this.name = name;
12         this.age = age;
13     }
14     public int getCard() {
15         return card;
16     }
17     public void setCard(int card) {
18         this.card = card;
19     }
20     public String getName() {
21         return name;
22     }
23     public void setName(String name) {
24         this.name = name;
25     }
26     public int getAge() {
27         return age;
28     }
29     public void setAge(int age) {
30         this.age = age;
31     }
32     @Override
33     public String toString() {
34         return "Person [card=" + card + ", name=" + name + ", age=" + age + "]";
35     }
36     @Override
37     public int hashCode() {
38         final int prime = 31;
39         int result = 1;
40         result = prime * result + age;
41         result = prime * result + card;
42         result = prime * result + ((name == null) ? 0 : name.hashCode());
43         return result;
44     }
45     @Override
46     public boolean equals(Object obj) {
47         if (this == obj)
48             return true;
49         if (obj == null)
50             return false;
51         if (getClass() != obj.getClass())
52             return false;
53         Person other = (Person) obj;
54         if (age != other.age)
55             return false;
56         if (card != other.card)
57             return false;
58         if (name == null) {
59             if (other.name != null)
60                 return false;
61         } else if (!name.equals(other.name))
62             return false;
63         return true;
64     }    
65 }

二、创建Test类

 1 package HomeWork0607;
 2 
 3 import java.util.ArrayList;
 4 import java.util.Collections;
 5 import java.util.Comparator;
 6 import java.util.List;
 7 
 8 public class ComparatorTest {
 9     public static void main(String[] args) {
10         Person person1 = new Person(1002,"小明",16);
11         Person person2 = new Person(1004,"小红",20);
12         Person person3 = new Person(1006,"小强",18);
13         Person person4 = new Person(1008,"小张",15);
14         List<Person> list = new ArrayList<>();
15         list.add(person1);
16         list.add(person2);
17         list.add(person3);
18         list.add(person4);
19         System.out.println("排序前:"+list);
20         System.out.println("=======按年龄比较大小=======");
21         Age age = new Age();
22         Collections.sort(list,age);
23         for (int i = 0; i < list.size(); i++) {
24             System.out.println(list.get(i));
25         }
26         
27         
28         System.out.println("======按身份证号比较大小======");
29         Card card = new Card();
30         Collections.sort(list,card);
31         for (int i = 0; i < list.size(); i++) {
32             System.out.println(list.get(i));
33         }
34         
35     }
36 }
37 
38 
39 class Card implements Comparator<Person>{
40 
41     @Override
42     public int compare(Person arg0, Person arg1) {
43         return arg0.getCard()-arg1.getCard();//从小到大排序
44     }
45 }
46 class Age implements Comparator<Person>{
47     public int compare(Person arg0, Person arg1) {
48         return arg0.getAge()-arg1.getAge();//从小到大排序
49     }
50 }

三、运行截图