Feedback.java

import java.util.*;

public class Feedback
{ 
    //instance variables
    String feedback;
    
    public Feedback()
    {
        feedback = "";
    }
    
    public boolean getFeedback(Code comp, Code user)
    {
        if(comp == null || user == null)
        {
            throw new IllegalArgumentException("Violation of precondition:" + 
                                               " comp must not be null and user must not be null.");
        }
        
        feedback = "";
        
        char black = 'B';
        char white = 'W';
        
        Peg[] userCode = new Peg[comp.size()];
        Peg[] compCode = new Peg[comp.size()];
        
        for(int i = 0; i < comp.size(); i++)
        {
            userCode[i] = user.getPeg(i);
            compCode[i] = comp.getPeg(i);
        }
        
        int maxSize = comp.size(); 
        
        //first we will iterate and check for black
        //once compared set the code array element to null,
        //to avoid double match of colors
        for(int i = 0; i < maxSize; i++)
        {
            //first checks if the position and color are the same
            if(compCode[i].equals(userCode[i]))
            {
                feedback += black;
                compCode[i] = null;
                userCode[i] = null;
            }
        }
        //now, iterate again and check for white
        for(int i = 0; i < maxSize; i++)
        {      
            for(int j = 0; j < maxSize; j++)
            {
                //checks if the color is the same, but position
                //is different
                if(compCode[i] != null && userCode[j] != null)
                {
                    if(compCode[i].equals(userCode[j]))
                    {
                        feedback += white;
                        compCode[i] = null;
                        userCode[j] = null;
                    }
                }
            }
        }
        
        //method returns true if the user wins and false otherwise
        if(comp.equals(user))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    
    // adds all the Blacks to the string, then all of the Whites
    // then returns the string
    public String toString()
    {
        String str = "";
        if(feedback.length() == 0)
        {
            str += "No pegs";
        }
        else
        {
            for(int i = 0; i < feedback.length(); i++)
            {
                if(feedback.charAt(i) == 'B')
                {
                    str += "Black ";
                }
            }
            
            for(int i = 0; i < feedback.length(); i++)
            {
                if(feedback.charAt(i) == 'W')
                {
                    str += "White ";
                }
            }
        }
        
        return str;
    }
}