$8\mathrm{.}17\mathrm{.}3$: Write and test a class that models a ball that bounces in a given direction.

A ball bounces along the x$-$axis between a wall at $0$ and another wall at a given distance. The move method advances its position by one unit. When it reaches either wall, it changes direction.

$/**$

This class models a ball that bounces off walls.

$*/$

public class Ball

$\{$

$//$ Instance variables

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

$/**$

Constructs a ball at position $0$ traveling east.

@param rightWall the position of the wall to the right

$*/$

public Ball$($int rightWall$)$

$\{$

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

$\}$

$/**$

Moves the ball.

$*/$

public void move$()$

$\{$

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

$\}$

$/**$

Gets the current position.

@return the current position

$*/$

public int getPosition$()$

$\{$

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

$\}$

$\}$