Ball.java

import java.awt.*;
import java.util.Random;

public class Ball extends Rectangle {
    int xVelocity;
    int yVelocity;
    Random random;
    int speed=2;
    Ball(int x,int y,int width,int height){
        super(x,y,width,height);
        random=new Random();
        int randomXDirection=random.nextInt(2);
        if(randomXDirection==0){
            randomXDirection--;
        }
        setXDirection(randomXDirection*speed);
        int randomYDirection=random.nextInt(2);
        if(randomYDirection==0){
            randomYDirection--;
        }
        setYDirection(randomYDirection*speed);
    }

    public void setYDirection(int randomYDirection) {
        yVelocity=randomYDirection;
    }

    public void setXDirection(int randomXDirection) {
        xVelocity=randomXDirection;
    }

    public void move() {
        x+=xVelocity;
        y+=yVelocity;
    }

    public void draw(Graphics g) {
        g.setColor(Color.WHITE);
        g.fillOval(x,y,width,height);
    }
}