Mememto 备忘录模式

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package com.lonton.designpatterns;import java.util.List;import java.util.ArrayList;class Life{private String time;private List<Mememto> mememtos = new ArrayList<Mememto>();public void setTime(String time){System.out.println("Setting time to " + time);this.time = time;}public void saveToMememto(){System.out.println("Saving time: " + time +  " to Memento");mememtos.add(new Mememto(time));}public void restoreFromMememto(int index){time = mememtos.get(index).getSavedTime();System.out.println("Time restored from Memento: " + time);}    class Mememto{private final String time;public Mememto(String time){this.time = time;}public String getSavedTime(){return time;}}}public class MememtoTest{public static void main(String[] args){Life life = new Life();life.setTime("2000 B.C");;life.saveToMememto();life.setTime("1000 B.C");;life.saveToMememto();life.setTime("2000 A.D");;life.saveToMememto();life.setTime("2008 A.D");;life.saveToMememto();life.restoreFromMememto(2);}}

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