备忘录模式 - ToB企服应用市场:ToB评测及商务社交产业平台

/**
* @author 长名06
* @version 1.0
* 保存对象的状态/数据
*/
public class Memento {
//保存的状态
private String savedState;
public Memento(String s){
savedState = s;
}
public String getStateInfo(){//获取状态信息
return savedState;
}
}
/**
* @author 长名06
* @version 1.0
* 游戏角色类需要保存状态的类
*/
public class Originator {
//状态信息
private String state;
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
//可以保存状态信息到备忘录对象中，并返回该备忘录对象
public Memento saveStateMemento(){
return new Memento(state);
}
//通过备忘录对象，恢复对象状态
public void restoreStateFromMemento(Memento memento){
state = memento.getStateInfo();
}
}
/**
* @author 长名06
* @version 1.0
* 管理所有的备忘录对象
*/
public class Caretaker {
private List<Memento> mementoList = new ArrayList<>();
public void add(Memento memento){
mementoList.add(memento);
}
/**
* 根据索引获取原始对象对应的备忘录对象
* @param index
* @return
*/
public Memento get(int index){
return mementoList.get(index);
}
public void delete(Memento memento){
mementoList.remove(memento);
}
}
public class Client {
public static void main(String[] args) {
Originator originator = new Originator();
Caretaker caretaker = new Caretaker();
originator.setState(" 状态#1 攻击力是100 ");
//保存了状态1
caretaker.add(originator.saveStateMemento());
//保存了状态2
originator.setState(" 状态#2 攻击力是80 ");
caretaker.add(originator.saveStateMemento());
//保存了状态3
originator.setState(" 状态#2 攻击力是60 ");
caretaker.add(originator.saveStateMemento());
System.out.println("当前状态" + originator.getState());
//恢复到状态1
originator.restoreStateFromMemento(caretaker.get(0));
System.out.println("恢复后的装态" + originator.getState());
}
}

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/**
* @author 长名06
* @version 1.0
* 游戏角色的备忘录类
*/
public class Mementor {
private int attackPower;//攻击力
private int defensePower;//防御力
public Mementor(int attackPower,int defensePower){
this.attackPower = attackPower;
this.defensePower = defensePower;
}
public int getAttackPower() {
return attackPower;
}
public void setAttackPower(int attackPower) {
this.attackPower = attackPower;
}
public int getDefensePower() {
return defensePower;
}
public void setDefensePower(int defensePower) {
this.defensePower = defensePower;
}
}
/**
* @author 长名06
* @version 1.0
* 游戏角色
*/
public class GameRole {
private int attackPower;
private int defensePower;
public Mementor createMementor(){
return new Mementor(attackPower,defensePower);
}
public void restoreStateFromMementor(Mementor mementor){
attackPower = mementor.getAttackPower();
defensePower = mementor.getDefensePower();
}
public void showState(){
System.out.println("游戏角色当前攻击力" + this.attackPower + "防御力" + this.defensePower);
}
public int getAttackPower() {
return attackPower;
}
public void setAttackPower(int attackPower) {
this.attackPower = attackPower;
}
public int getDefensePower() {
return defensePower;
}
public void setDefensePower(int defensePower) {
this.defensePower = defensePower;
}
}
/**
* @author 长名06
* @version 1.0
* 守护者对象，用于管理(保存游戏状态/数据对象)的对象
*/
public class Caretaker {
//只保存一个角色的一次状态
private Mementor mementor;
//对于一个游戏角色的多个状态
// private List<Mementor> mementorList = new ArrayList<>();
//保存多个游戏角色的状态
// private HashMap<String,ArrayList<Mementor>> rolesMap;
public Mementor getMementor() {
return mementor;
}
public void setMementor(Mementor mementor) {
this.mementor = mementor;
}
}
public class Client {
public static void main(String[] args) {
GameRole gameRole = new GameRole();
gameRole.setAttackPower(100);
gameRole.setDefensePower(200);
System.out.print("打BOSS前状态\t");
gameRole.showState();
//将当前状态保存到一个备忘录类中
Caretaker caretaker = new Caretaker();
caretaker.setMementor(gameRole.createMementor());
//打BOSS状态下降
gameRole.setDefensePower(100);
gameRole.setAttackPower(50);
//打BOSS后状态
System.out.print("打BOSS后状态\t");
gameRole.showState();
//恢复状态
gameRole.restoreStateFromMementor(caretaker.getMementor());
//展示恢复后的状态
System.out.print("恢复后的状态\t");
gameRole.showState();
}
}

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