public class Originator {
  private String state = "OFF";
  public String getState() {
    return state;
  }
  public void setState(String state) {
    this.state = state;
  }

  public Memento createMemento() {
    return new Memento(state);
  }
  public void setMemento(Memento memento) {
    state = memento.getState();
    System.out.println("状態を" + state + "に戻しました");
  }
}