Please help to add $($Java code$)$ methods so the balls alternately grow and shrink. Help with determine the minimum size as well as the maximum size of balls. Also need to add an instance variable to the Ball class that indicates whether the ball is currently shrinking or growing. This variable can be of type boolean. Furthermore, need help to create code that changes the value of the variable when the ball reaches its minimum size and maximum size.

Also help with modify the action$()$ method to give the ball the pulsating property.

Please add the complement code in the below code and send the code back in whole with the changes in it$.$

Thanks!

import java.awt.$*$;

import java.awt.event.$*$;

import javax.swing.$*$;

class Ball $\{$

static int defaultDiameter $=10$;

static Color defaultColor $=$ Color.yellow;

static Rectangle defaultBox $=$ new Rectangle$(0,0,100,100)$;

private int x$,$ y;

private int dx$,$ dy;

private int diameter;

private Color color;

private Rectangle box;

private Object ball;

private Ball ball$1$;

public Ball$($ int x$0,$ int y$0,$ int dx$0,$ int dy$0)\{$

x $=$ x$0$;

y $=$ y$0$;

dx $=$ dx$0$;

dy $=$ dy$0$;

color $=$ defaultColor;

diameter $=$ defaultDiameter;

$\}$

public void setColor$($ Color c $)\{$

color $=$ c;

$\}$

public void setBoundingBox$($ Rectangle r $)\{$

box $=$ r;

$\}$

public void paint$($ Graphics g $)\{$

g$.$setColor$($ color $)$;

g$.$fillOval$($ x$,$ y$,$ diameter, diameter $)$;

$\}$

void constrain$()\{$

int x$0=$ box.x;

int y$0=$ box.y;

int x$1=$ x$0+$ box.width $-$ diameter;

int y$1=$ y$0+$ box.height $-$ diameter;

if $($x $<$ x$0)\{$

dx $=$ Math.abs$($dx$)$;

$\}$

if $($x $>$ x$1)\{$

dx $=-$Math.abs$($dx$)$;

$\}$

if $($y $<$ y$0)\{$

dy $=$ Math.abs$($dy$)$;

$\}$

if $($y $>$ y$1)\{$

dy $=-$Math.abs$($dy$)$;

$\}$

$\}$

public void action$()\{$

x $=$ x $+$ dx;

y $=$ y $+$ dy;

constrain$()$;

$\}$

public void setDiameter$($int d$)\{$

diameter $=$ d;

$\}$

$\}$

class BallPanel extends JPanel implements ActionListener $\{$

private int width, height;

private Ball ball;

private Ball ball$2$;

private Timer timer $=$ new Timer$(50,$ this$)$;

public BallPanel$($int width, int height$)\{$

this.width $=$ width;

this.height $=$ height;

ball $=$ new Ball$($width $/10,$ height $/5,5,5)$;

ball$2=$ new Ball$($width $/10,$ height $/5,6,6)$;

ball.setBoundingBox$($new Rectangle$(0,0,$ width, height$))$;

ball.setColor$($Color$.$WHITE$)$;

timer.start$()$;

ball$2.$setColor$($Color$.$RED$)$;

ball$2.$setBoundingBox$($new Rectangle$(0,0,$ width, height$))$;

$\}$

public void paintComponent$($Graphics g$)\{$

g$.$setColor$($Color$.$black$)$;

g$.$fillRect$(0,0,$ width, height$)$;

ball.paint$($g$)$;

ball$2.$paint$($g$)$;

$\}$

public void actionPerformed$($ActionEvent e$)\{$

if $($width $!=$ getWidth$()||$ height $!=$ getHeight$())$

wasResized$($getWidth$(),$ getHeight$())$;

ball.action$()$;

ball$2.$action$()$;

repaint$()$;

$\}$

public void wasResized$($int newWidth, int newHeight$)\{$

width $=$ newWidth;

height $=$ newHeight;

ball.setBoundingBox$($ new Rectangle$(0,0,$ width, height $))$;

ball$2.$setBoundingBox$($ new Rectangle$(0,0,$ width, height $))$;

$\}$

$\}$

class BallWorld extends JFrame $\{$

private BallPanel panel $=$ new BallPanel $(180,180)$;

public BallWorld $()\{$

Container c $=$ getContentPane$()$;

c$.$add$($panel$,$ BorderLayout.CENTER$)$;

setSize$(200,200)$;

setLocation$(100,100)$;

setVisible$($true$)$;

setDefaultCloseOperation$($EXIT$\_$ON$\_$CLOSE$)$;

$\}$

public static void main$($String args$[])\{$

BallWorld world $=$ new BallWorld$()$;

$\}$

$\}$