Can't add elements to an arraylist?

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Ok, I think I have found the answer

ArrayList<Circle> circleArray = new ArrayList();

void draw()
{
  if(keyPressed)
  {
    Circle test = new Circle(mouseX, mouseY);
    circleArray.add(test);
  }
  println(circleArray.size());
  for(Circle circles : circleArray)
  {
    circles.display();
  }
}

The other class simply has a constructor that takes 2 floats x and y as inputs, and display() draws a circle with x and y and a fixed size.

It works just fine until I add “background(0);” at the beginning of my draw() method, after which nothing is added to my ArrayList (println returns 0.0), so I guess it has other properties

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