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Java Java Objects Creating the MVP Scrabble Tiles

Clara Stancu
Clara Stancu
5,687 Points
Posted by Clara Stancu
Clara Stancu
5,687 Points

Don't understand the "bummer"

In the statement it says: "to return true if the tile is in the tiles field, and false if it isn't." I did exactly that: return true ... return false. But the bummer says he wants the result if the expression; and if instead of "return true" i put "return isTile", the "bummer" says exactly the same thing. To what expression does it refer ?

ScrabblePlayer.java 
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
    boolean isTile = tiles.indexOf(tiles) != -1;
    if (isTile) return true ;
    return false;
  }

}

1 Answer

Jonathan Grieve
MOD
Jonathan Grieve
Treehouse Moderator 91,253 Points
Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points

The code is challenging you to work out a way of passing without using an if statement but instead returning the result of the expression in hasTile()

  public boolean hasTile(char tile) {
    // TODO: Determine if user has the tile passed in
    return tiles.indexOf(tile) >= 0;
  }

This works because you're passing an expression to the return keyword, which only ever evaluates to true or false. Sionce the expression checks for greater than zero it will be a "truthy" value so returns true. In every ever instance (i.e. a retuen of less than zero the return value will be false.

Hope this helps! :)