Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Objects Creating the MVP Scrabble Tiles

Rick Garland
Rick Garland
2,738 Points
Posted by Rick Garland
Rick Garland
2,738 Points

null pointer exception

cant quite get the hang this one

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

  private String tiles;
  private String hits;
  private String misses;

   String ScrabblePlayer (String tiles) {
     this.tiles = tiles;
     hits = "";
     misses = "";
     return tiles;
  }

  public String getTiles() {
    return tiles;
  }

  public boolean addTile(char letters) {
    // TODO: Add the tile to tiles
  boolean isHits = tiles.indexOf(letters) != -1;
    if(isHits) {
      hits += tiles;
    }else{
      misses  += tiles;
     this.tiles += tiles;
    }
    return isHits;
  }

  public boolean hasTile(char tile) {
    // TODO: Determine if user has the tile passed in
    return false;
  }

}

1 Answer

Manish Giri
Manish Giri
16,266 Points
Manish Giri
Manish Giri
16,266 Points

The addTile() method originally was public void addTile(char tile). You're just meant to add the char tile to the string tiles. It's a void so it shouldn't return anything.

Looks like you've changed the method to return a boolean instead.

Here's my addTile() - 

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) {
    // TODO: Add the tile to tiles
    tiles += tile;

  }

  public boolean hasTile(char tile) {
    // TODO: Determine if user has the tile passed in

  }

}