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

Lucas Caldeira
Lucas Caldeira
977 Points
Posted by Lucas Caldeira
Lucas Caldeira
977 Points

could not solve this ,please help!

So back to that ScrabblePlayer. I found that it's not enough to know if they just have a tile of a specific character. We need to know how many they actually have. Can you please add a method called getTileCount that uses the for each loop you just learned to loop through the characters and increment a counter if it matches? Return the count, please, thanks!

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;
  }
}

2 Answers

Christopher Augg
Christopher Augg
21,223 Points
Christopher Augg
Christopher Augg
21,223 Points

Hello Lucas,

We need to add a method called getTileCount(char tile) that returns an int and uses a for each loop to count how many characters match a tile character in the String mHand with a tile character that is passed into it. We can use the String method toCharArray() to provide the String in array form so that we can iterate over the chars. Craig gives a good example of how to do this in the video but you can also google how to loop over a String and find an example like:

http://stackoverflow.com/questions/3799130/how-to-iterate-through-a-string

Please let me know if you have any further issues and I can walk you through it in more detail.

Lucas Caldeira
Lucas Caldeira
977 Points
Lucas Caldeira
Lucas Caldeira
977 Points

whats wrong with this code ?? please help ! says !! 'e' was checked expected 1 but got 8.

public int getTileCount(char tile){ int count = 0; for (char letter : mHand.toCharArray()) { if (mHand.indexOf(tile) >= 0) { count += 1; } } return count;
}

Christopher Augg
Christopher Augg
21,223 Points
Christopher Augg
Christopher Augg
21,223 Points

You are very close. The indexOf(tile) >= 0 is your issue. You do not need this since you just want to compare the tile character passed in with the character from each iteration of the loop. Remember how Craig talked about a Char in the ASCII table was also a number? Well, you can do a simple if statement like if (letter == tile) { count++} because it will compare them. Just don't do that with Strings as you should always use the String.equals(String) for them. Hope this helps.

 public int getTileCount(char tile) { 

      //increment a counter tells us we need a variable to hold an int called counter
      int counter = 0;    

     //uses the for each loop. Craig went over this on the video and showed how
    //to iterate over a String using the toCharArray() method.
       for (char character : mHand.toCharArray()) {
          // increment a counter if it matches. Hmm. Do we need to pass in a tile
         // to test against each tile in mHand?
    if (character == tile ) {
          counter++;   //increment counter - this must be an int
    }
  }
 return counter;

}