STOP the explosion

Processing Coding Questions
2

See below.

Particle [] pickles = new Particle [100];


void setup () {

  size (500, 500);
  smooth ();
  for (int i=0; i<pickles.length; i++) {
    pickles [i] = new Particle ();
  }
}


void draw () {
  background (0); //clear the background

  for (int i=0; i<pickles.length; i++) {
    pickles[i].update();
  }
}

class Particle {

  float x;
  float y;

  float velX ; // speed or velocity
  float velY;


  Particle () {
    //x and y position to be in middle of screen
    x = width/2;
    y = height/2;

    velX = random (-10, 10);
    velY = random (-10, 10);

} 

  void update () {

    x+=velX;
    y+=velY;
    // Stop them from going off the left side.
    if( x < 5 ){
      x = 5;
      velY = 0;
    }
    // Stop them from going off the right side.
    if( x > width - 5 ){
      x = width - 5;
      velY = 0;
    }
    // I will leave these two up to you!
    // TODO: Stop them from going out the top.
    // TODO: Stop them from going out the bottom.
    
    
        
    fill (255);
    ellipse (x, y, 10, 10);
  }
}