Hi,
I am new to processing and trying to change my code with define a class and use an object from that class.
I was following all the steps from the book"Learning Processing" but still having problems with it. Here is my code, I would really appreciate your help. Thank you.

class TV {
  // declare all global variables
boolean button = false;                     //the Breaking Bad logo is set

PImage img;                                 //declares PImage variable img - screen image / Breaking Bad logo
PImage img2;                                //declares PImage variable img2 - wall image

PFont font;                                 //declares font

int a = 155;
int b = 125;

//constructore gets called once in the begining when a new TV is made
TV () {
}

// a function to draw a table
void drawTable() {
// Table
strokeWeight(1);                        //set the stroke weight
beginShape();                           //begin the shape
fill(#F0D8C6);                          //color of the table
vertex(0,500);
vertex(260,330);
vertex(700,330);
vertex(700,500);
endShape();                             //end the shape
}

// a function to draw a TV
void drawTV() {
//TV body
strokeWeight(1);                        //set the stroke weight to 1
fill(50);                               //color of the round stand
ellipse(345,394,125,50);                //round stand

strokeWeight(1);
fill(0);                                //color of the stand
rect(295,358,100,50);                   //stand

//TV screen
strokeWeight(26);                       //set the stroke weight
strokeJoin(ROUND);                      //round the stroke corners
rect(150,125,400,225);                  //screen

//Blue Button
strokeWeight(1);                       //set stroke weight to 1
fill(#4A65E5);                         //buttons color - blue
rect(530,352,15,10);                   //blue button

//message on the screen
textSize(20);                          //text size
text ("Press the blue button! This show is not good for you!", 240,470); //this message will appear on the screen x=240, y=470
fill(0);                               //color black
}

void fuzzyPicture() {                 //a function to fuzzy picture

// If the mouse is pressed the fuzzy picture will appear
if (button)  {
  //nested FOR loop block
for (int a = 155; a < 542; a = a+10) {
  for (int b = 125; b < 342; b = b+10) {
  fill(random(255), random(255), random(255)); //sets random RGB colors
 rect(a,b,10,10); //draws 10x10 rectangle based on random x,y, coordinates declared above
  }
}
}else{                                //if the button is not pressed draw the Breaking Bad logo
                                      //draw the Breaking Bad logo
  image(img,150,125,400,225);         //set the image
  }
}

// mouse pressed
void mousePressed() {                 //defines input if mouse pressed
// if the blue button is pressed the fuzzy screen will appear
  if (mouseX > 530 && mouseX < 545 && mouseY > 348 && mouseY < 360) {
    button = !button;
  }
}


TV tvBB;

void setup() {
  size(700,500);                             //set screen size
  smooth();                                  //smooth the edges
  frameRate(10);                             //frame rate 10
 
  tvBB = new TV() ;

//messages and instructions // will print inside the message board
println ("Season Finale of Breaking Bad");
println ("-- Press the blue button");
println ("-- Press the blue button again to return to Breaking Bad logo");

font = loadFont ("ArialNarrow-15.vlw");   //load the font
textFont(font);

//images included
img = loadImage("breaking-bad-logo.png"); //loads JPEG of Breaking Bad logo
img2 = loadImage("red_wallpaper.jpg");    //loads JPEG of red wallpaper
}

void draw() {
  background(img2);                      //set background
  tvBB.drawTable();                           //draw a table
  tvBB.drawTV();                              //draw a TV
  tvBB.fuzzyPicture();                        //draw a fuzzy picture
}