I used the array list balls tutorial on processing.org but since I'm new to processing I had quite som difficulties.
I managed to change the colors off the ellipses.
But actually I'd like to use a different color everytime an ellipse is created, choosing between (177, 228,0), (242,227,4), (255,178,0) and (255,134,0) randomly.

Can someone please explain to me how I can do that?
Thank you lots in advance..


This is the code, I'm having at the moment:

ArrayList balls;
int ballWidth = 300;

void setup() {
  size(1280, 1024);
  smooth();
  noStroke();

  // Create an empty ArrayList
  balls = new ArrayList();
 
  // Start by adding one element
  balls.add(new Ball(width/2, 0, ballWidth));
}

void draw() {
  background(0,0);
 

  // 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 = balls.size()-1; i >= 0; i--) {
    // An ArrayList doesn't know what it is storing so we have to cast the object coming out
    Ball ball = (Ball) balls.get(i);
    ball.move();
    ball.display();
    if (ball.finished()) {
      // Items can be deleted with remove()
      balls.remove(i);
    }
   
  } 
 
}

void mousePressed() {
  // A new ball object is added to the ArrayList (by default to the end)
  balls.add(new Ball(mouseX, mouseY, random(ballWidth)));
}




// Simple bouncing ball class

class Ball {
 
  float x;
  float y;
  float speed;
  float gravity;
  float w;
  float life = 255;
 
  Ball(float tempX, float tempY, float tempW) {
    x = tempX;
    y = tempY;
    w = tempW;
    speed = 0;
    gravity = 0.1;
  }
 
    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;
    }
  }
 
  boolean finished() {
    // Balls fade out
    life--;
    if (life < 0) {
      return true;
    } else {
      return false;
    }
  }
 
  void display()
  {
    // Display the circle
    fill (255, 178, 0, life);
    //stroke(0,life);
    ellipse(x,y,w,w);
  }