java中实现Comparable接口实现自定义排序的示例

实例如下所示：

class student implements comparable{
  string name;
  int gpa;
  @override
  public int compareto(object arg0) {
    // todo auto-generated method stub
    student s = (student)arg0;
    
    if(gpa == s.gpa) return name.compareto(s.name);
    else if(gpa < s.gpa) return -1;
    else if(gpa > s.gpa) return 1;
    else return 0;
    
  }
  
  
}

class test {
  public static void main(string[] args){
    scanner in = new scanner(system.in);
    
    int n = in.nextint();
    
    student[] s = new student[n];
    
    for(int i = 0;i < n;i ++){
      s[i] = new student();
      s[i].name = in.next();
      s[i].gpa = in.nextint();
    }
    
    arrays.sort(s);
    
    for (student ss : s) 
    { 
      system.out.println(ss.name); 
      system.out.println(ss.gpa); 
    } 
  }
}

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