class Button {
  Button() { 
  }
  void setup(int _x, int _y, boolean _status)
  {
    x = _x;
    y = _y;
    size = 80;
    status = _status;
  }
  void draw()
  {
    ellipse(x,y,size,size);
  }
  int x;
  int y;
  boolean status;
  int size;
}

Button[] button = new Button[16];


void setup()
{
  size(500, 500);
  
  for ( int i = 0; i < 16; i++ ) {
    button[i] = new Button();
    button[i].setup(100+(i%4)*100, 100+(i/4)*100, false);        
  }
}

void draw()
{
  background(0);
  for( int i = 0; i < 16; i++ ){
    button[i].draw();
  }
}