A ball bounces inside a given rectangle, starting at the rectangle's bottom left corner at (0, 0) and initially moving in the northeast direction. When the ball bounces on a wall, it turns 90 degrees clockwise. If it bounces on a corner, its direction reverses. The move method advances its position by one unit in the (x)-direction (left or right) and one unit in the (y)-direction (up or down).

/** This class models a ball that bounces off walls. */ public class Ball { // Instance variables /* Your code goes here */ /** Constructs a ball at (0, 0) traveling northeast. @param rightWall the position of the wall to the right @param topWall the position of the wall at the top */ public Ball(int rightWall, int topWall) { /* Your code goes here */ } /** Moves the ball. */ public void move() { /* Your code goes here */ } /** Turns the ball direction 90 degrees clockwise. */ private void turn() { /* Your code goes here */ } /** Gets the current x-position. @return the x-position */ public int getX() { /* Your code goes here */ } /** Gets the current y-position. @return the y-position */ public int getY() { /* Your code goes here */ } }