大话设计模式_备忘录模式

以玩游戏为例，大战boss前保存角色状态，大战过boss之后恢复角色大战boss之前的状态。

package com.wzs.design;/** * 大话设计模式--page186 备忘录模式 *  * @author Administrator *  */public class MemoMode {public static void main(String[] args) {// 大战boss前GameRole lixiaoyao = new GameRole();lixiaoyao.getInitState();lixiaoyao.stateDisplay();// 保存进度RoleStateCaretaker stateAdmin = new RoleStateCaretaker();stateAdmin.memento = lixiaoyao.saveState();// 大战boss，损耗严重lixiaoyao.fight();lixiaoyao.stateDisplay();// 回复之前状态lixiaoyao.recoveryState(stateAdmin.memento);lixiaoyao.stateDisplay();}}/* * 游戏角色 */class GameRole {private int vit; // 生命力private int atk; // 攻击力private int def; // 防御力// 状态显示public void stateDisplay() {System.out.println("角色当前状态:");System.out.println("生命力:" + this.vit);System.out.println("攻击力:" + this.atk);System.out.println("防御力:" + this.def);System.out.println();}// 获得初始状态public void getInitState() {this.vit = 100;this.atk = 100;this.def = 100;}// 战斗过后状态public void fight() {this.vit = 0;this.atk = 0;this.def = 0;}// 保存角色状态public RoleStateMemento saveState() {return new RoleStateMemento(vit, atk, def);}// 恢复角色状态public void recoveryState(RoleStateMemento memento) {this.vit = memento.getVit();this.atk = memento.getAtk();this.def = memento.getDef();}public int getVit() {return vit;}public void setVit(int vit) {this.vit = vit;}public int getAtk() {return atk;}public void setAtk(int atk) {this.atk = atk;}public int getDef() {return def;}public void setDef(int def) {this.def = def;}}/* * 角色状态存储箱 */class RoleStateMemento {private int vit;private int atk;private int def;public RoleStateMemento(int vit, int atk, int def) {this.vit = vit;this.atk = atk;this.def = def;}public int getVit() {return vit;}public void setVit(int vit) {this.vit = vit;}public int getAtk() {return atk;}public void setAtk(int atk) {this.atk = atk;}public int getDef() {return def;}public void setDef(int def) {this.def = def;}}/* * 角色状态管理者 */class RoleStateCaretaker {public RoleStateMemento memento;public RoleStateMemento getMemento() {return memento;}public void setMemento(RoleStateMemento memento) {this.memento = memento;}}