Java Comparator HackerRank Solution

Java Comparator HackerRank Solution

Java Interview Questions

Problem:

Comparators are used to compare two objects. In this challenge, you'll create a comparator and use it to sort an array.

The Player class is provided for you in your editor. It has  fields: a  String and a  integer.

Given an array of  Player objects, write a comparator that sorts them in order of decreasing score; if  or more players have the same score, sort those players alphabetically by name. To do this, you must create a Checker class that implements the Comparator interface, then write an int compare(Player a, Player b) method implementing the Comparator.compare(T o1, T o2) method.

Input Format:

Input from stdin is handled by the locked stub code in the Solution class.

The first line contains an integer, , denoting the number of players.
Each of the  subsequent lines contains a player's  and , respectively.

Constraints:

•  players can have the same name.
• Player names consist of lowercase English letters.

Output Format

You are not responsible for printing any output to stdout. The locked stub code in Solution will create a Checker object, use it to sort the Player array, and print each sorted element.

Sample Input

5
amy 100
david 100
heraldo 50
aakansha 75
aleksa 150

Sample Output

aleksa 150
amy 100
david 100
aakansha 75
heraldo 50

Solution in JAVA:

import java.util.*;

// Write your Checker class here

class Checker implements Comparator<Player>

{  public int compare(Player a,Player b)

{    if(a.score>b.score)

      return -1;

     else if(a.score<b.score)

     return 1;

     else

     return a.name.compareTo(b.name);

}

}

//  Checker class closed

class Player{

    String name;

    int score;

    

    Player(String name, int score){

        this.name = name;

        this.score = score;

    }

}

class Solution {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int n = scan.nextInt();

        Player[] player = new Player[n];

        Checker checker = new Checker();

        

        for(int i = 0; i < n; i++){

            player[i] = new Player(scan.next(), scan.nextInt());

        }

        scan.close();

     

        Arrays.sort(player, checker);

        for(int i = 0; i < player.length; i++){

            System.out.printf("%s %s\n", player[i].name, player[i].score);

        }

    }

}

So, Guys that was the solution of Java Comparator HackerRank Solution in Java.



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