Thread: Help on simple easy program

Hello guys! I have decided to try to program this really simple program that prints out a game! Basically there are three pieces: slider, diag, and jumper, it is a 5x5 board, and slider can only move one direction in any direction, diag moves diagonal, and jumper moves to a random spot. They don't move if there is a wall. Each turn it prints out a new board(lol i know bad but whatever) and when a piece moves onto another the one that was there before dies, so if jumper moves onto slider, slider dies. My code compiles but when it runs, it prints out a bunch of boards that show random stuff, like sometimes after a piece dies it comes back. here is my very bad code:

/**
 * The board:
 *        y
 *     1 2 3 4 5
 *  1  * * * * *
 *  2  * * * * *
 *x 3  * * * * *
 *  4  * * * * *
 *  5  * * * * *
**/
 
public class Piece{
        static int sx, sy, dx, dy, jx, jy;
        static int pieces = 3;
        static boolean sAlive = true;
        static boolean dAlive = true;
        static boolean jAlive = true;
        public static void printBoard(){
                for (int x = 1; x <= 5; x++){
                        for (int y = 1; y <= 5; y++){
                                if (x==jx && y == jy){
                                        if (jAlive){
                                                System.out.print("J");
                                        }
                                        else{
                                                System.out.print("-");
                                        }
                                }
                                else if (x==dx && y == dy){
                                        if (dAlive){
                                                System.out.print("D");
                                        }
                                        else{
                                                System.out.print("-");
                                        }
                                }
                                else if (x==sx && y == sy){
                                        if (sAlive){
                                                System.out.print("S");
                                        }
                                        else{
                                                System.out.print("-");
                                        }
                                }
                                else{
                                        System.out.print("-");
                                }
                                System.out.print(" ");
                        }
                        System.out.println();
                }
        }
        public static void makeNumbers(){
            sx = (int)(Math.random()*5+1);
                sy = (int)(Math.random()*5+1);
                dx = (int)(Math.random()*5+1);
                dy = (int)(Math.random()*5+1);
                while (dx == sx && dy == sy){
                        dx = (int)(Math.random()*5+1);
                        dy = (int)(Math.random()*5+1);
                }
                jx = (int)(Math.random()*5+1);
                jy = (int)(Math.random()*5+1);
                while (jx == sx && jy == sy){
                        jx = (int)(Math.random()*5+1);
                        jy = (int)(Math.random()*5+1);
                }
                while (dx == jx && dy == jy){
                        jx = (int)(Math.random()*5+1);
                        jy = (int)(Math.random()*5+1);
                }
        }
        public static void main(String [] args){
                int direction;
                makeNumbers();
                printBoard();
                Slider s = new Slider();
                Diag d = new Diag();
                Jumper j = new Jumper();
                while (pieces > 0){
                                if (sAlive){
                                direction = (int)(Math.random()*4+1);
                                sx = s.movePieceX(sx, direction);
                                sy = s.movePieceY(sy, direction);
                                if (sx == dx && sy == dy){
                                        dAlive = false;
                                        pieces--;
                                }
                                if (sx == jx && sx == jy){
                                        jAlive = false;
                                        pieces--;
                                }
                                System.out.println();
                                System.out.println("Sam's turn!");
                                printBoard();
                        }
                        if (dAlive){
                                direction = (int)(Math.random()*4+1);
                                dx = d.movePieceX(dx, direction);
                                dy = d.movePieceY(dy, direction);
                                if (dx==0 || dy==0){
                                        dx=0;
                                        dy=0;
                                }
                                if (sx == dx && sy == dy){
                                        sAlive = false;
                                        pieces--;
                                }
                                if (dx == jx && dx == jy){
                                        jAlive = false;
                                        pieces--;
                                }
                                System.out.println();
                                System.out.println("Donald's turn!");
                                printBoard();
                        }
                        if (jAlive){
                                jx = j.movePieceX();
                                jy = j.movePieceY();
                                if (jx == dx && jy == dy){
                                        dAlive = false;
                                        pieces--;
                                }
                                if (sx == jx && sx == jy){
                                        sAlive = false;
                                        pieces--;
                                }
                                System.out.println();
                                System.out.println("Jimmy's turn!");
                                printBoard();
                        }
                }
        }
}
 
public class Slider extends Piece{
        public int movePieceX(int x, int direction){
                if (direction == 1){
                        if (x==1){
                                return 0;
                        }
                        else{
                                return x-1;
                        }
                }
                else if (direction == 2){
                        if (x==0){
                                return 1;
                        }
                        else{
                                return x+1;
                        }
                }
                else if (direction == 3){
                        return x;
                }
                else{
                        return x;
                }
        }
        public int movePieceY(int y, int direction){
                if (direction == 1){
                        return y;
                }
                else if (direction == 2){
                        return y;
                }
                else if (direction == 3){
                        if (y==1){
                            return 0;
                        }
                        else{
                                return y-1;
                        }
                }
                else{
                        if (y==5){
                                return 0;
                        }
                        else{
                                return y+1;
                        }
                }
        }
}
 
public class Diag extends Piece{
        public int movePieceX(int x, int direction){
                if (direction == 2 || direction == 3){
                        if (x==5){
                                return 0;
                        }
                        else{
                                return x+1;
                        }
                }
                else{
                        if (x==1){
                                return 0;
                        }
                        else{
                                return x-1;
                        }
                }
        }
        public int movePieceY(int y, int direction){
                if (direction == 2 || direction == 1){
                        if (y==5){
                                return 0;
                        }
                        else{
                                return y+1;
                        }
                }
                else{
                        if (y==1){
                                return 0;
                        }
                        else{
                                return y-1;
                        }
                }
        }
}
 
public class Jumper extends Piece{
        public int movePieceX(){
                return (int)(Math.random()*5+1);
        }
        public int movePieceY(){
                return (int)(Math.random()*5+1);
        }
}