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$).$

An image showing the ball's trajectory inside a rectangle. The rectangle exists on a square grid, with $6$ units $($or grid squares$)$ of width and $4$ units of height. The ball's path starts in the bottom left corner of the rectangle. The ball then travels on a straight diagonal path until it reaches a point $4$ grid units up and $4$ grid units to the right. The ball's path then rotates $90$ degrees, now going down and to the right, until it reaches a point $2$ grid units to the right and $2$ grid units down. The ball's path then rotates $90$ degrees, now going down and to the left, until it reaches a point $2$ grid units down and $2$ grid units to the left. The ball's path then rotates $90$ degrees, now going up and to the left, until it reaches a point $1$ grid unit up and $1$ grid unti to the left.$/**$

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$)$

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$/*$ Your code goes here $*/$

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$/**$

Moves the ball.

$*/$

public void move$()$

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$/*$ Your code goes here $*/$

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$/**$

Turns the ball direction $90$ degrees clockwise.

$*/$

private void turn$()$

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$/*$ Your code goes here $*/$

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$/**$

Gets the current x$-$position.

@return the x$-$position

$*/$

public int getX$()$

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$/*$ Your code goes here $*/$

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$/**$

Gets the current y$-$position.

@return the y$-$position

$*/$

public int getY$()$

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$/*$ Your code goes here $*/$

$\}$

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