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Java Java Objects (Retired) Creating the MVP For Each Loop

dongji cui
dongji cui
2,464 Points
Posted by dongji cui
dongji cui
2,464 Points

what does "public boolean hasTile(char tile) { return mHand.indexOf(tile) > -1; }" mean here?

"public boolean hasTile(char tile) { return mHand.indexOf(tile) > -1; }"

ScrabblePlayer.java 
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) {
   return mHand.indexOf(tile) > -1;
  }
}

1 Answer

Dan Johnson
Dan Johnson
40,532 Points
Dan Johnson
Dan Johnson
40,532 Points

The hasTile method checks mHand to see if it contains a specific character (representing a tile in this case). It does this by using the indexOf method of the String class. indexOf will either return the position of the character if it finds one, or -1 if the String doesn't contain that character. So by checking if the return value is greater than -1, you can determine if a character exists within a String.