developerdiary_oop_entities_arch.java

class Logic
{
  void update()
  {
    view.show(data.get());
  }
  void update(Pretty p)
  {
    data.set(p);
    update();
  }
}

interface View
{
  void show(Pretty p);
}
interface Data
{
  Pretty get();
  void set(Pretty p);
}