public Stack(Block x, Block y) {
super(x, y);
prePickedUp = new PickedUp(x);
preFree = new Free(y);
preHeavier = new Heavier(y, x);
remPickedUp = new PickedUp(x);
remFree = new Free(y);
addOn = new On(x, y);
addFreeArm = new FreeArm();
init();
}
public Stack() {
super(null, null);
prePickedUp = new PickedUp(null);
preFree = new Free(null);
preHeavier = new Heavier(null, null);
remPickedUp = new PickedUp(null);
remFree = new Free(null);
addOn = new On(null, null);
addFreeArm = new FreeArm();
init();
}
