Java Comparator – Hacker Rank Solution

Java Comparator - Hacker Rank Solution
Java Comparator- Hacker Rank Solution

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


Java Comparator – Hacker Rank Solution

import java.util.*;
// Write your Checker class here
class Checker implements Comparator<Player> {
    @Override
    public int compare(Player o1, Player o2) {
       if (o1.score > o2.score) {
           return -1;
       } if (o1.score < o2.score) {
           return 1;
       } if (o1.score == o2.score) {
           return o1.name.compareTo(o2.name);
       }
    return 0;
    }
}
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);
        }
    }
}

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