Im completely stuck here.

public class ScrabblePlayer 
{
  // A String representing all of the tiles that this player has
  private String tiles;


  public ScrabblePlayer() 
  {
    tiles = "";
  }

  public String getTiles() 
  {
    return tiles;
  }

  public void addTile(char tile) 
  {
    tiles += tile;
  }

  public boolean hasTile(char tile) 
  {
    return tiles.indexOf(tile) != -1;
  }
  private int counter;
  public int getCountOfLetter(char letter)
  {

      for(int i=0; i<tiles.length(); i++) 
      {
        if(tiles.toCharArray(i) == letter ) 
        {
          counter++;
        } 

      }
    }
    return counter;
  }

}

// This code is here for example purposes only
public class Example {

  public static void main(String[] args) {
    ScrabblePlayer player1 = new ScrabblePlayer();
    player1.addTile('d');
    player1.addTile('d');
    player1.addTile('p');
    player1.addTile('e');
    player1.addTile('l');
    player1.addTile('u');

    ScrabblePlayer player2 = new ScrabblePlayer();
    player2.addTile('z');
    player2.addTile('z');
    player2.addTile('y');
    player2.addTile('f');
    player2.addTile('u');
    player2.addTile('z');

    int count = 0;
    // This would set count to 1 because player1 has 1 'p' tile in her collection of tiles
    count = player1.getCountOfLetter('p');
    // This would set count to 2 because player1 has 2 'd'' tiles in her collection of tiles
    count = player1.getCountOfLetter('d');
    // This would set 0, because there isn't an 'a' tile in player1's tiles
    count = player1.getCountOfLetter('a');

    // This will return 3 because player2 has 3 'z' tiles in his collection of tiles
    count = player2.getCountOfLetter('z');
    // This will return 1 because player2 has 1 'f' tiles in his collection of tiles
    count = player2.getCountOfLetter('f');
  }
}