please i need help with my java challenge question

public class ScrabblePlayer {
    private String mHand;

    public ScrabblePlayer() {
        mHand = "";
    }

    public String getHand() {
       return mHand;
    }

    public void addTile(char tile) {
        // Adds the tile to the hand of the player
      mHand += tile;

    }

    public boolean hasTile(char tile) {
         if(mHand.indexOf(tile) >= 0) {  // Checks if the tile is in the hand.
           return true; // If it is, we return true.
         } // By this point, we know that if the code reaches  below this if statement, the tile is not in the hand, so we can         return false.
       return false; 
    }
}