Java设计模式之备忘录模式.docVIP

备忘录模式（Memento） 概念 当你需要让对象返回之前的状态时，就使用备忘录模式。在不破坏封装性的前提下捕获一个对象的内部状态，并在对象之外保存这个状态。这样以后就可以将对象恢复到原先保存的状态。 分类：对象行为型。 当你需要让对象返回之前的状态时（例如，你的用户请求“撤销”），就是用备忘录模式。 源码 GamePlayer类 public class GamePlayer { //封装属性 private int hp; //生命值 private int attack; //攻击力 private int defense; //防御力 public int getHp() { return hp; } public void setHp(int hp) { this.hp = hp; } public int getAttack() { return attack; } public void setAttack(int attack) { this.attack = attack; } public int getDefense() { return defense; } public void setDefense(int defense) { this.defense = defense; } //状态显示方法 public void situationdisplay(){ System.out.println(角色当前状态:); System.out.println(生命值:+hp); System.out.println(攻击力:+attack); System.out.println(防御力+defense); } //保存状态方法 public Memorandum savestatus(){ return new Memorandum(hp,attack,defense); } //恢复方法 public void recoverymode(Memorandum memorandum){ this.hp = memorandum.getOldhp(); this.attack = memorandum.getOldattack(); this.defense = memorandum.getOlddefense(); } //初始化状态方法 public void getInitialStatus(){ this.hp = 100; this.attack = 100; this.defense = 100; } //战斗后的状态 public void fight(){ this.hp -= 50; this.attack -= 50; this.defense -= 50; } } Memorandum类 //备忘录 用于存档 public class Memorandum { private int oldhp; private int oldattack; private int olddefense; //带参数的构造方法 public Memorandum(int hp,int attack,int defense){ this.oldhp = hp; this.oldattack = attack; this.olddefense = defense; } public int getOldhp() { return oldhp; } public void setOldhp(int oldhp) { this.oldhp = oldhp; } public int getOldattack() { return oldattack; } public void setOldattack(int oldattack) { this.oldattack = oldattack; } public int getOlddefense() { return olddefense; } public void setOlddefense(int olddefense) { this.olddefense = olddefense; } } Admin类 public class Admin { private Memorandum memorandum; //声明备忘录 public Memorandum getMemorandum() { return mem