Breakout ball class

package com.breakout.objects;

import com.breakout.Breakout;
import com.gej.object.GObject;
import com.gej.util.GUtil;

public class Ball extends GObject {

    public Ball(float x, float y){
        super(Breakout.BALL, x, y);
    }

    public void update(long elapsedTime){
        if (getVelocityX()==0 && getVelocityY()==0){
            //if (GKeyBoard.isPressed(KeyEvent.VK_SPACE)){
                setVelocityY(-0.02f);
                int random = GUtil.random(2);
                switch (random){
                    case 0:
                        setVelocityX(-0.02f);
                        break;
                    case 1:
                        setVelocityX(0.02f);
                        break;
                }
           // }
        }
    }

    public void bounce(GObject other){
        if (getVelocityX()>0){
            setX(other.getX()-getWidth());
        } else if (getVelocityX()<0){
            setX(other.getX()+other.getWidth());
        }
        if (getVelocityY()>0){
            setY(other.getY()-getHeight());
        } else if (getVelocityY()<0){
            setY(other.getY()+other.getHeight());
        }
        bounce();
    }

    public void bounce(){
        boolean left = false;
        boolean right = false;
        boolean up = false;
        boolean down = false;
        if (dx < 0) {
            left = true;
        } else if (dx > 0) {
            right = true;
        }
        if (dy < 0) {
            up = true;
        } else if (dy > 0) {
            down = true;
        }
        if (left && up) {
            dx = -dx;
        }
        if (left && down) {
            dy = -dy;
        }
        if (right && up) {
            dx = -dx;
        }
        if (right && down) {
            dy = -dy;
        }
    }

    public void collision(GObject other){
        if (other instanceof Bat || other instanceof Block){
            bounce(other);
        } else if (other instanceof Stone){
            other.destroy();
            bounce(other);
        }
    }

}