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How to implement Comparator Interface in Java with an example ?

Program to demonstrate the implementation of Comparator Interface in Java

package com.hubberspot.collections.example;

import java.util.*;

class Student 
{
  public String name; 
  public double percentage;
 
  Student(String name, double percentage)
  {
    this.name = name; this.percentage = percentage; 
  }
 
  public String toString()
  {
    return "\nName = " + name + "\n"+
           "Percentage = " + percentage+"\n";
  }
}

class CompareWithPercentage implements Comparator
{
  public int compare(Object obj1, Object obj2)
  {
    Student o1 = (Student)obj1;
    Student o2 = (Student)obj2;
  
    if(o1.percentage == o2.percentage)
       return 0;

    if(o1.percentage > o2.percentage)
       return 1;
    return -1;
  }
}

public class ComparatorExample
{
  public static void main(String[] args)
  {
    ArrayList list = new ArrayList();

    list.add(new Student("Dinesh",76.2));
    list.add(new Student("Jonty",96.5));
    list.add(new Student("Gunjan",81.7));
    list.add(new Student("Parishrut",62.1));
  
    System.out.println("Before Sorting : \n" + list);
  
    Collections.sort(list,new CompareWithPercentage());
  
    System.out.println("\nAfter Sorting : \n" + list);
  }
}

Output of the program :


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