In this project, I am creating a code where balls 'bounce' around the world and change color every time they bounce against the edge of the world. Every time a ball collides with another ball, one of the balls should disappear. However every time I try to run my code for that an error shows up. How can I make it so that one of the balls disappear when two balls collide?
private int imgNumber; /** * Create a ball. */ public Ball(int direction) { setRotation(direction); imgNumber = 0; } /** * Act - do whatever the Ball wants to do. This method is called whenever * the 'Act' or 'Run' button gets pressed in the environment. */ public void act() { collision(); move(4); getWorld().showText("Colored Balls:" + Integer.toString(ballcount), getWorld().getWidth()/2, 50); if (isAtEdge()) { //change color of balls when bounce agaisnt edge of world turn(getRotation()+Greenfoot.getRandomNumber(61)+150); changeImage(); } } /** * Change image of this ball */ public void changeImage() { imgNumber++; if (imgNumber == 5) { imgNumber = 0; } setImage ("button-" + imgNumber + ".png"); } public void collision() { if (canSee (Animal.class)) { getWorld().removeObject(this); } }