// Java Program to show how to override the compareTo()

// method of comparable interface

import java.util.*;

// implementing Comparable interface

public class GFG implements Comparable<GFG> {

    String name;

    int age;

    // Class constructor

    GFG(String name, int age)

    {

        this.name = name;

        this.age = age;

    }

    public int getage() { return age; }

    public String getname() { return name; }

    public static void main(String[] args)

    {

        // Creating GFG class object

        GFG ob[] = new GFG[4];

        // Inserting elements in the objects

        ob[0] = new GFG("Aayush", 14);

        ob[1] = new GFG("Ravi", 12);

        ob[2] = new GFG("Sachin", 19);

        ob[3] = new GFG("Mohit", 20);

        // sort the array,using overridden method

        Arrays.sort(ob);

        for (GFG o : ob) {

            // printing the sorted array objects name and

            // age

            System.out.println(o.name + " " + o.age);

        }

        // if you want to create a dynamic array ,then you

        // can create an arraylist

        ArrayList<GFG> objects = new ArrayList<>();

        // creating a new GFG object

        GFG newObject1 = new GFG("Rohan Devaki", 20);

        // inserting the new object into the arraylist

        objects.add(newObject1);

        // creating a new GFG object

        GFG newObject2 = new GFG("Algorithammer", 22);

        // inserting the new object into the arraylist

        objects.add(newObject2);

        // using Collections to sort the arraylist

        Collections.sort(objects);

        for (GFG o : objects) {

            // printing the sorted objects in arraylist by

            // name and age

            System.out.format("%s  %d\n", o.name, o.age);

        }

    }

    // Overriding compareTo() method

    @Override public int compareTo(GFG o)

    {

        if (this.age > o.age) {

            // if current object is greater,then return 1

            return 1;

        }

        else if (this.age < o.age) {

            // if current object is greater,then return -1

            return -1;

        }

        else {

            // if current object is equal to o,then return 0

            return 0;

        }

    }

}