originator.java

来自「《JAVA与模式》附书中源代码」· Java 代码 · 共 44 行

package com.javapatterns.memento.historyonself;

public class Originator
{
	public String state;

    public Originator()
    {
    }

    public void changeState(String state)
    {
		this.state = state;
        System.out.println("State has been changed to: " + state);
    }

    public Memento createMemento()
    {
		return new Memento(this);
    }

    public void restoreMemento(MementoIF memento)
    {
        Memento m = (Memento) memento;
		;
    }

    class Memento implements MementoIF
    {
		private String state;

        private String getState()
        {
			return state;
        }

        private Memento(Originator o)
        {
			this.state = o.state;
        }
    }
}