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public class Ball extends Actor { /** * Responds to motion control from the arrow keys and removes * any buttons from the world when it intersects them. */ public void act() { handleKeyPress(); lookForButton(); } /** * Handles input from the arrow keys. */ public void handleKeyPress() { checkLeftArrow() ; checkRightArrow() ; checkUPArrow() ; checkDownArrow() ; } } /** * Checks to see if the left arrow key is being pressed. * If it is, then the ball sets its rotation angle to zero degrees * and moves backward 5 units. If it is not being pressed, * this method does nothing. */ public void checkLeftArrow() { public void act() { if (Greenfoot.isKeyDown("left") { setRotation(0); turn(-5); } } } /** * Checks to see if the right arrow key is being pressed. * If it is, then the ball sets its rotation angle to zero degrees * and moves forward 5 units. If it is not being pressed, * this method does nothing. */ public void checkRightArrow() { public void act() { if (Greenfoot.isKeyDown("right") { setRotation(0); turn(5); } } } /** * Checks to see if the up arrow key is being pressed. * If it is, then the ball sets its rotation angle to 270 degrees * and moves forward 5 units. If it is not being pressed, * this method does nothing. */ public void checkUpArrow() { public void act() { if (Greenfoot.isKeyDown("up") { setRotation(270); turn(5); } } } /** * Checks to see if the down arrow key is being pressed. * If it is, then the ball sets its rotation angle to 90 degrees * and moves forward 5 units. If it is not being pressed, * this method does nothing. */ public void checkDownArrow() { public void act() { if (Greenfoot.isKeyDown("down") { setRotation(90); turn(5); } } } public class Button extends Actor { /** * Checks to see if the ball is "touching" an object of the Button class. * If it is, then the ball removes from the World a Button that it touches. * If the ball isn't touching an object of the Button class, then this * method does nothing. */ public void lookForButton() { Actor B =getOneIntersectingObject(Ball.class) if (isTouching(Ball.Class)) { removeTouching(Ball.class) } } }