This is my coding:

 

int intPaddleSideX = 15;
int intPaddleSideY = 115;
int intPaddleRightX = 10;
int intPaddleRightY = 350;
float fltPaddleLeftX = 690;
float fltPaddleLeftY = 350;
float fltEndPaddleX, fltEndPaddleY;
int Counter = 0;
int miss = 0;
int intp1score = 0;
int intp2score = 0;
float fltBallX, fltBallY, x, y;
float fltXSpeed = 8;
float fltYSpeed = 6;
float fltBallSize = 30;
float fltXDirec = -2;
float fltYDirec = 2;
float fltX = random(10,690);
int intX = width/2;
int intY = height/2;
PFont font;

void setup() {
  size(700,700);
 fltBallX = width/2;
fltBallY = height/2;
font = loadFont ("Arial-BoldMT-48.vlw");
}

void draw() {
    background(0);
  rectMode(CENTER);
  collision();
  texts();
  RightPaddle();
  LeftPaddle();
  objects();
  fltBallX = fltBallX + (fltXSpeed*fltXDirec);
  fltBallY = fltBallY + (fltYSpeed*fltYDirec);

}

void texts() {
  textFont(font, 48);
  textAlign(CENTER);
  text("pong", width/2, 200);
  //player 1
  textFont(font, 37);
  textAlign(LEFT);
  text("PLAYER 1: ", 10,300);
  text(intp1score, 220,300);
 if(fltBallY > 700){
   intp1score = intp1score + 1;
 }
  //player 2
  textFont(font, 37);
  textAlign(LEFT);
  text("PLAYER 2: ", 400, 300);
  text(intp2score, 600, 300);
  if(fltBallY < 0){
    intp2score = intp2score + 1;
 }

}
 
  void objects(){
   rect(intPaddleRightX,intPaddleRightY,intPaddleSideX,intPaddleSideY);
   rect(fltPaddleLeftX,fltPaddleLeftY,intPaddleSideX,intPaddleSideY);
   ellipse(fltBallX,fltBallY,fltBallSize,fltBallSize);
  
}

void RightPaddle(){
  if(keyPressed){
    if(key == 'w' || key == 'W'){
      fltEndPaddleY = intPaddleRightY;
      intPaddleRightY = intPaddleRightY - 2;
      if(intPaddleRightY <= 30){
        intPaddleRightY = intPaddleRightY + 2;
      }
    }
  }
  if(keyPressed){
    if(key == 's' || key == 'S'){
      fltEndPaddleY = intPaddleRightY;
      intPaddleRightY = intPaddleRightY + 2;
      if(intPaddleRightY >= height-50){
        intPaddleRightY = height-52;
      }
    }
  }
}
void LeftPaddle(){
if(keyPressed){
  if(key == CODED){
    if(keyCode == UP){
      fltEndPaddleX = fltPaddleLeftY;
      fltPaddleLeftY = fltPaddleLeftY - 2;
      if(fltPaddleLeftY <= 30){
        fltPaddleLeftY = fltPaddleLeftY + 2;
      }
    }
  }
}
if(keyPressed){
  if(key == CODED){
    if(keyCode == DOWN){
      fltEndPaddleX = fltPaddleLeftY;
      fltPaddleLeftY = fltPaddleLeftY + 2;
      if(fltPaddleLeftY >= height-50){
        fltPaddleLeftY = height-52;
      }
    }
  }
}
}

void collision(){
  if(fltBallX >= intPaddleRightX && (fltBallX < intPaddleRightX + 70) && fltBallY > 660){
  fltBallX = fltBallX * fltXDirec;
}
if(fltBallY < height - intPaddleRightY && fltBallX < intPaddleRightX + (intPaddleSideX/2) && fltBallX > intPaddleRightX - (intPaddleSideX/2)){
  fltYDirec = fltYDirec * -1;
}
if(fltBallY < height - fltPaddleLeftY && fltBallY < fltPaddleLeftX + (intPaddleSideY/2) && fltBallY > fltPaddleLeftY - (intPaddleSideY/2)){
  fltBallY = fltBallY * fltYDirec;
}
  if (fltBallY > height-fltBallSize || fltBallY < fltBallSize) {
    fltYDirec *= -1;
  }
}
 
 
 
void mousePressed (){
  fltBallX = width/2;
  fltBallY = height/2;
  fltBallSize = 30;
  ellipse(fltBallX,fltBallY,fltBallSize,fltBallSize);
 
}