Implementation example of Comparable interface and custom sorting in Java

The following editor will bring you an example of implementing the Comparable interface in Java to implement custom sorting. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

The example is as follows:

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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