Java --Chess Game

chess_game.java

//Chess Game in Java

import java.util.Scanner;

public class KnightMoves
{
	static Scanner sc = new Scanner(System.in);
	// the following static array represents the 8
	// possible moves a knight can make

static int[ ] [ ] moves = { (-2, +1), (-1, +2), (+1, +2),(+2,-1),(+1,-2),)-2,-1));

public static void main(String[ ] args)
{
	System.out.println("Welcome to the + Knight Move calculator.\n");

	do
	{
		showKnightMoves();
	}
	while (getYorN("do it again?"));
}

public static void showKnightMoves()
{
	//The first dimension of this file (a, b, c, etc)
	//The second dimension is the rank (1, 2, 3, etc)
	//Thus, board[3][4] is square d5
	// A value of 0 means the square is empty
	// 1 means the knight is in the square
	// 2 means the knight could move to the square
	int[ ] [ ] board = new int [8] [8];

String kSquare; // the knight's initial position as a square
Pos kPos; 	  // the knight's position as a Pos

// get the knight's initial position
do
{
	System.out.print("Enter knight's position: ");
	kSquare = sc.nextLine();
	kPos = convertSquareToPos(kSquare);
}
while (kPos == null);

board[kPos.x] [kPos.y] = 1;
System.out.println("\nThe knight is at square" + convertPosToSquare(kPos));
System.out.Println("From here the knight can move:");


for (int move = 0; move < moves.length; move ++)
{
	int x, y;
	x = moves[move] [0];  // the x for this move
	y = moves[move] [1]; // the y for this move
	Pos p = calculateNewPos(kPos, x, y);
	if (p !=null)
	{
		 System.out.println(convertPosToSquare(p));
		board[p.x] [p.y] = 2;
}

printBoard(board);
}

// this method converts squares such as a1 or d5 to x, y coordinates such as [0][0] or [3][4]
public static Pos convertSquareToPos(String square)
{
	int x = -1;
	int y = -1;
	char rank, file;

	file = square.charAt(0);
	if (file == 'a') x = 0;
	if (file =='b') x = 1;
	if(file=='c') x  = 2;
	if(file=='d') x = 3;
	if(file=='e') x = 4;
	if(file=='f') x = 5;
	if(file=='g') x = 6;
	if(file=='h') x= 7;

rank =  square.charAt(1);
	if(rank=='1') y = 0;
	if(rank=='2') y = 1;
	if(rank=='3') y = 2;
	if(rank=='4') y =3;
	if(rank=='5') y = 4;
	if(rank=='6') y = 5;
	if(rank=='7') y = 6;
	if(rank=='8') y = 7;

	if (x == 1 ||  y == -1)
{
	return null;
}
else
	return new Pos(x, y); }

// this method converts x, y coordinates such as [0][0] or [3][4] to squares such as a1 or d5.
public static String convertPosToSquare(Pos p)
{
	String file = "";

	if (p.x == 0) file = "a";
	if (p.x == 1) file ="b";
	if(p.x == 2) file ="c";
	if(p.x == 3) file ="d";
	if(p.x == 4) file ="e";
	if(p.x == 5) file ="f";
	if(p.x ==6) file ="g";
	if(p.x ==7) file ="h";

return file +(p.y +1);
}

//this method calculates a new Pos given, a starting pos, an x move and x y move. It returns null if the resulting move would be off the board.

public static Pos calculateNewPos(Pos p, int x, int y)
{
	// rule out legal moves
	if (p.x + x < 0)
	return null;
	if (p.x + x > 7)
	return null;
	if(p.x + y < 0)
	return null;
	if(p.y + y > 7)
	return null;

	//return new position
	return new Pos(p.x + x, p.y + y);
}

public static void printBoard(int[ ][ ] b)
{
	for (int y = 7; y >= 0; y --)
	{
		for (int x = 0; x < 8; x++)
		{
			if (b[x][y] == 1)
				System.out.print("x");
			else if (b[x][y] == 2)
				System.out.Print(" - "); }
			System.out.println(); }}


public satic bolean getYorN(String prompt)
{
	while (true)
	{
		String answer;
		System.out.print("\n" + prompt + "(Y or N) ");
		answer = sc.nextline();
		if (answer.equalsIgnoreCase("Y"))
		return true;
		else if (anser.equalsignoreCase("N"))
	return false;
}}}

// this class represents x, y coordinates on the board
class Pos
{
	public int x;
	public Pos(int x, int y)
	{
		this.x = x;
		this.y = y;
}}