APCS_CH8_Chess960R1Refactored.java

/*
Chess960V1Refactored.java       MrG     2013.0226
purpose:    randomly generate 1 of the 960 Fischer Random Chess Boards
required file:  Chess960V1.java                 main class
translator: javac Chess960V1Refactored.java
interpreter:    java Chess960V1Refactored
*/

import java.util.Random;

public static class Chess960V1Refactored
{
    //this is a static class so:
    //String[] is constructed in main()
    //String[] is modified in main()
    //String[] is accessed in main()
    public static void main(String[] args)
    {
        String[] whitePieces = new String[8];
        Bishop(whitePieces,0);
        Bishop(whitePieces,1);
        setPiece(whitePieces,"Q");
        setPiece(whitePieces,"N");
        setPiece(whitePieces,"N");
        setLastPiece(whitePieces,"R");
        setLastPiece(whitePieces,"K");
        setLastPiece(whitePieces,"R");
        System.out.println(toString(whitePieces));
    }

    /**
    modify String[] with "B" on a randomly selected even or odd index
    @param wP white's first rank of pieces on the chess board
    @param offset add 0 for even index, add 1 for odd
    */
    public static void Bishop(String[] wP, int offset)
    {
        Random die = new Random();
        wP[die.nextInt(4)*2+offset]="B";
    }

    /**
    modify String[] with piece on randomly selected index for an empty square
    @param wP white's first rank of pieces on the chess board
    @param piece can be "Q" for Queen or "N" for Knight
    */
    public static void setPiece(String[] wP, String piece)
    {
        int pos;
        Random die = new Random();
        do
            pos = die.nextInt(8);
        while(wP[pos]!=null);
        wP[pos]=piece;
    }

    /**
    modify String[] with piece on an index for the first empty square found
    @param wP white's first rank of pieces on the chess board
    @param piece can be "R" for Rook or "K" for King
    */
    public static void setLastPiece(String[] wP, String piece)
    {
        int pos=0;
        while(wP[pos]!=null)
        {
            pos++;
        }
        wP[pos]=piece;
    }

    /**
    access contents of a String[]
    @param wP white's first rank of pieces on the chess board
    @return String[] first rank as a String
    */
    public static String toString(String[] wP)
    {
        String temp = "";
        for(int k=0; k<wP.length; k++)
        {
            temp += wP[k];
        }
        return temp;
    }
}