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I have to add 2018 in title since confluence doesn't allow same page name in the same space

ArrayList<Movable> movables;
int ballWidth = 48;

int randomLast = 0;  // to feel random, it has to be not random

void setup() {
  size(800, 600);
  noStroke();

  // Create an empty ArrayList (will store Ball objects)
  movables = new ArrayList<Movable>();
  randomSeed(millis()+second());  // it's random enough
}

void draw() {
  // background(255);
  rectMode(CORNER);
  stroke(0);
  strokeWeight(2);
  fill(255);
  rect(0, 0, width - 1, height - 1);	// show a border

  // With an array, we say balls.length, with an ArrayList, we say balls.size()
  // The length of an ArrayList is dynamic
  // Notice how we are looping through the ArrayList backwards
  // This is because we are deleting elements from the list  
  for (int i = movables.size()-1; i >= 0; i--) { 
    // An ArrayList doesn't know what it is storing so we have to cast the object coming out
    Movable movable = movables.get(i);
    movable.move();
    movable.display();
    if (movable.finished()) {
      // Items can be deleted with remove()
      movables.remove(i);
    }
  }
}

void mousePressed() {
  // A new object is added to the ArrayList (by default to the end)
  int i;
  do{
   i = (int)random(3000) % 3;
  }while(i == randomLast);
  
  randomLast = i;
  switch( i ) {
  case 0:
    movables.add(new Ball(mouseX, mouseY, ballWidth+random(ballWidth / 2)));
    break;
  case 1:
    movables.add(new Box(mouseX, mouseY, ballWidth+random(ballWidth / 2), ballWidth+random(ballWidth / 2) ));
    break;
  case 2:
    movables.add(new Triangle(mouseX, mouseY, ballWidth+random(ballWidth / 2)));
    break;
  }
}


class Ball extends Movable {
  float w;
  Ball(float tempX, float tempY, float tempW ) {
    super( tempX, tempY );  // call the parent
    w = tempW;
  }
  void display() {
    super.display();  // do it first
    noStroke();
    ellipse(x, y, w, w);
  }
}

class Box extends Movable {
  float w, h;
  float ang;
  Box(float tempX, float tempY, float tempW, float tempH) {
    super( tempX, tempY );
    w = tempW;
    h = tempH;
    ang = 0.0;
  }
  void display() {
    // without calling super let's do something else
    fill( 255, 0, 0, life);  // let's make it red
    noStroke();
    ang += 1.0;
    pushMatrix();  // try google what this is
    rectMode(CENTER);
    translate(x, y);
    rotate(radians(ang));
    rect(0, 0, w, h);
    popMatrix();
  }
}

class Triangle extends Movable {
  float w;
  float ang;
  Triangle(float tempX, float tempY, float tempW ) {
    super( tempX, tempY );  // call the parent
    w = tempW;
    ang = 0.0;
  }
  void display() {
    // without calling super let's do something else
    fill( 0, 0, 255, life);  // let's make it blue
    strokeWeight(1);
    stroke(0, life);
    ang += 1.0;
    pushMatrix();  // try google what this is
    translate(x, y);
    rotate(radians(ang));
    triangle( -w/2, -w/2, 0, w/2, w/2, -w/2 );
    popMatrix();
  }
}
// Simple movable class
class Movable {

  float x;
  float y;
  float speed;
  float speedx;
  float gravity;
  float life = 512;

  Movable(float tempX, float tempY) {
    x = tempX;
    y = tempY;
    speed = 0;
    gravity = 0.1;
    speedx = random(-3,3);
  }

  void move() {
    // Add gravity to speed
    speed = speed + gravity;
    // Add speed to y location
    y = y + speed;
    // If square reaches the bottom
    // Reverse speed
    if (y > height) {
      // Dampening
      speed = speed * -0.8;
      y = height;
    }
    // x move
    x = x+speedx;
    if( x < 10 && speedx < 0){
      speedx = -speedx;
    }
    if( x > width - 10 && speedx > 0 ){
      speedx = -speedx;
    }
  }

  boolean finished() {
    // Balls fade out
    life--;
    if (life < 0) {
      return true;
    } else {
      return false;
    }
  }

  void display() {
    fill(0, life);
  }
}