write a java program to combintion of coins

import java.util.*;

public class Main {
public static void main(String[] args)
{

 Toss("",2);

}
public static void Toss(String ans,int n)
{
if(n==0)
{
System.out.println(ans);
return;
}
Toss(ans+"H",n-1);
Toss(ans+"T",n-1);
}

}