java中实现Comparable接口实现自定义排序

 1 class Student implements Comparable{
 2     String name;
 3     int gpa;
 4     @Override
 5     public int compareTo(Object arg0) {
 6         // TODO Auto-generated method stub
 7         Student s = (Student)arg0;
 8
 9         if(gpa == s.gpa) return name.compareTo(s.name);
10         else if(gpa < s.gpa) return -1;
11         else if(gpa > s.gpa) return 1;
12         else return 0;
13
14     }
15
16
17 }
18
19 class Test {
20     public static void main(String[] args){
21         Scanner in = new Scanner(System.in);
22
23         int n = in.nextInt();
24
25         Student[] s = new Student[n];
26
27         for(int i = 0;i < n;i ++){
28             s[i] = new Student();
29             s[i].name = in.next();
30             s[i].gpa = in.nextInt();
31         }
32
33         Arrays.sort(s);
34
35         for (Student ss : s)
36         {
37             System.out.println(ss.name);
38             System.out.println(ss.gpa);
39         }
40     }
41 }