Question on applyGuess() method

The purpose of this method is to leave the logic of the game to the game.

User input is ALWAYS a String. That is how it works in Java.

But for our Game in order to check user input applyGuess we need only one char, not the whole String.

That is why we create applyGuess(String letters) method, that can check String for emptiness, or do a lot of other stuff,

BUT at the end it will call applyGuess with char that is the first letter. Because at the end we still use check one character.

Correct me if i am wrong but is the last line of code suppose to return "True" or "False" since the method only accepts a return of "True" or "False"?

Yes when you write boolean you HAVE to return true or false

the way i am reading that last line is letters.charAt(0) locates the character within a String called "letter" by its index number and passes that character to "applyGuess(char letter)" and also returns that character.

Not exactly.

that last line is letters.charAt(0) takes FIRST character of a String parameter called "letter" and passes that character to "applyGuess(char letter)" method, that returns true or false.

That last method is base of our Game logic ...

  // They work together 

  // this one is called in our Game
  public boolean applyGuess(String letters){
    if(letters.length() == 0){
      throw new IllegalArgumentException("No letter found");
    }
    return applyGuess(letters.charAt(0));
  }

  // this one is used behind the scenes. Can be made private as well I think
  public boolean applyGuess(char letter) {
     // code
     // in the end return "true" or "false"
  }