java 基于comparator的比较器

1 import java.util.Comparator;
2  class Student {
3     private String name;
4     private int age;
5     public Student(String name,int age){
6         this.name=name;
7         this.age=age;
8     }
9     public boolean equals(Object obj){
10         if(this==obj){
11             return true;
12         }
13         if(!(obj instanceof Student)){
14             return false;
15         }
16         Student stu=(Student) obj;
17         if(stu.name.equals(this.name)&&stu.age==this.age){
18             if(stu.name.equals(this.name)&&stu.age==this.age){
19                 return true;
20             }else {
21                 return false;
22             }
23         }
24
25     }
26     public String toString(){
27         return name+"\t\t"+age;
28     }
29     public String getName() {
30         return name;
31     }
32     public void setName(String name) {
33         this.name = name;
34     }
35     public int getAge() {
36         return age;
37     }
38     public void setAge(int age) {
39         this.age = age;
40     }
41 };
42  class StudentComparator implements Comparator<Student>{
43     public int compare(Student s1,Student s2){
44         if(s1.equals(s2)){
45             return 0;
46         }else if(s1.getAge()<s2.getAge()){
47             return 1;
48         }else {
49             return -1;
50         }
51     }
52 }
53 public class comparatotdemo {
54     public static void main(String[] args) {
55         Student stu[]={
56                 new Student("Lisi",20),
57                 new Student("zs",22),
58                 new Student("ww",20),
59                 new Student("zl",20),
60                 new Student("sq",22)
61         };
62         java.util.Arrays.sort(stu,new StudentComparator());
63         for(int i=0;i<stu.length;i++){
64             System.out.println(stu[i]);
65         }
66     }
67 }