GameBoard.java

import java.io.*;

class GameBoard
{
    //instance variables
    private int numGuesses;
    private String[] board;
    private int index;
    //keeps track of what the row on the board that your'e changing as the user guesses
    
    //constructor generates a board out of an array of strings
    //intializes board and index and adds the first row displaying secret code of computer
    //index++
    public GameBoard(int n)
    {
        numGuesses = n;
        board = new String[numGuesses+1];
        index = 0;
        board[index] = ".... Secret Code";
        index++;
    }
    
    public void addPositions()
    {
        for(int i = 1; i <= numGuesses; i++)
        {
            board[i] = "....";
        }
    }
    
    public void changeRow(Code userCode, Feedback feedback)
    {
        if(userCode == null || feedback == null)
        {
            throw new IllegalArgumentException("Violation of precondition:" +
                                               "The user code and feedback cannot be null");
        }
        
        String str = "";
        str += userCode.toString() + " "; //adds user code to string
        str += "Feedback: " + feedback.toString(); //adds feedback to string
        board[index] = str; //sets the board row to new string
        index++; 
    }
    
    public int getNumGuesses()
    {
        return numGuesses;
    }
    
    public String toString()
    {
        String str = "";
        for(int i = 0; i <= numGuesses; i++)
        { //iterates through board and adds each row to the string
            str += board[i] + "\n";
        }
        return str;
    }
    
    public String winnerToString()
    {
        String str = "";
        for(int i = 1; i < index; i++)
        { //iterates through board until index that the user won in and adds those rows to the string
            str += board[i] + "\n"; 
    	}
    	return str;
    }
}