In this HackerRank java comparator problem in the java programming language you have Given an array of n Player objects, write a comparator that sorts them in order of decreasing score; if 2 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.

## HackerRank Java Comparator problem solution.

```import java.util.*;

class Checker implements Comparator<Player>{
@Override
public int compare(Player a, Player b){
if (a.score == b.score){
return a.name.compareTo(b.name);//alphabetically
} else {
return b.score - a.score;//decreasing
}
}
}
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);
}
}
}```

## Second solution in java8 programming.

```import java.util.*;

// Write your Checker class here
class Checker implements Comparator<Player>{

public int compare(Player a, Player b) {
// If 2 Players have the same score
if(a.score == b.score){
// Order alphabetically by name
return a.name.compareTo(b.name);
}

// Otherwise, order higher score first
return ((Integer) b.score).compareTo(a.score);
}
}
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);
}
}
}```