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Java Java Objects Creating the MVP Scrabble Tiles

Gendarme Docena
Gendarme Docena
1,509 Points
Posted by Gendarme Docena
Gendarme Docena
1,509 Points

Result of the expression?

Hi, can someone please take a look at my code? I wrote it out correctly but it doesn't want it in an if/else statement. I'm unsure on how it turn it into the "result of the expression.."

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

  public ScrabblePlayer() {
    tiles = "";
  }

  public String getTiles() {
    return tiles;
  }

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

  public boolean hasTile(char tile) {
    boolean itPassed = answer.indexOf(tile) != -1;
      if (itPassed) {
        return true;
  } else  { 
    return false;
      }
  }

}

2 Answers

Philip Gales
Philip Gales
15,193 Points

When I run your code it gives me the following error.

Bummer! While you could definitely solve this using an if statement, try returning the result of the expression.

This tells me that they want you to return the result of the boolean and not use an if statement. I erased the if statement and returned the boolean

  public boolean hasTile(char tile) {
    boolean itPassed = answer.indexOf(tile) != -1;
    return itPassed;
  }

I now get the following error:

Bummer! java.lang.NullPointerException (Look around ScrabblePlayer.java line 19)

Line 19 is where you declared your boolean itPassed. This is telling me something is wrong with the variable. I then realized "answer" has no meaning in this class so I changed it to tiles since we are checking if tile is in tiles.

Your final code is below.

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

  public ScrabblePlayer() {
    tiles = "";
  }

  public String getTiles() {
    return tiles;
  }

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

  public boolean hasTile(char tile) {
    boolean itPassed = tiles.indexOf(tile) != -1;
    return itPassed;
  }

}
Gendarme Docena
Gendarme Docena
1,509 Points
Gendarme Docena
Gendarme Docena
1,509 Points

Oh wow, I think I understand it much more now. It definitely worked, thank you so much!

Philip Gales
Philip Gales
15,193 Points

Glad it helped! Be sure to mark an answer "best answer" by clicking on the check mark next to add comment.

Blake Larson
Blake Larson
13,014 Points
Blake Larson
Blake Larson
13,014 Points

Another way..

return tiles.indexOf(tile) >= 0;