resizeable sketch in Processing (with notification of new size)

resizeable.pde

void setup() {
  size(640,480);
  frame.setResizable(true);
}

void draw() {
  background(frameCount);
}

void setBounds(int x1, int y1, int w, int h) {
  super.setBounds(x1,y1,w,h);
  println(w + "," + h);
}