类图：
Java代码：
import java.util.ArrayList;
import java.util.List;
public class Caretaker {
private List<Memento> list=new ArrayList<>();
public Memento getMemento() {
Memento mm=list.get(list.size()-2);
list.remove(list.size()-2);
return mm;
}
public void setMemento(Memento memento) {
list.add(memento);
}
}
public class Memento {
private String account;
private String password;
private String telNo;
public String getAccount() {
return account;
}
public void setAccount(String account) {
this.account = account;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getTelNo() {
return telNo;
}
public void setTelNo(String telNo) {
this.telNo = telNo;
}
public Memento(String account, String password, String telNo) {
this.account = account;
this.password = password;
this.telNo = telNo;
}
}
public class UserInfoDTO {
private String account;
private String password;
private String telNo;
public String getAccount() {
return account;
}
public void setAccount(String account) {
this.account = account;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getTelNo() {
return telNo;
}
public void setTelNo(String telNo) {
this.telNo = telNo;
}
public Memento saveMemento() {
return new Memento(account,password,telNo);
}
public void restoreMemento(Memento memento) {
this.account=memento.getAccount();
this.password=memento.getPassword();
this.telNo=memento.getTelNo();
}
public void show() {
System.out.println("Account:"+this.account);
System.out.println("Password:"+this.password);
System.out.println("TelNo:"+this.telNo);
}
}
public class Client {
public static void main(String[] args) {
// TODO Auto-generated method stub
UserInfoDTO user=new UserInfoDTO();
Caretaker c=new Caretaker();
user.setAccount("zhangsan");
user.setPassword("123456");
user.setTelNo("1310000000");
System.out.println("状态一:");
user.show();
c.setMemento(user.saveMemento());
System.out.println("-----------------------------");
user.setPassword("111111");
user.setTelNo("1310001111");
System.out.println("状态二:");
user.show();
c.setMemento(user.saveMemento());
System.out.println("-----------------------------");
user.setPassword("zyx666");
user.setTelNo("15733333333");
System.out.println("状态三:");
user.show();
c.setMemento(user.saveMemento());
System.out.println("-----------------------------");
user.setPassword("777777");
user.setTelNo("15511111111");
System.out.println("状态四:");
user.show();
c.setMemento(user.saveMemento());
System.out.println("-----------------------------");
user.setPassword("666666");
user.setTelNo("17455555555");
System.out.println("状态五:");
user.show();
c.setMemento(user.saveMemento());
System.out.println("-----------------------------");
user.restoreMemento(c.getMemento());
System.out.println("回到状态四:");
user.show();
System.out.println("-----------------------------");
user.restoreMemento(c.getMemento());
System.out.println("回到状态三:");
user.show();
System.out.println("-----------------------------");
user.restoreMemento(c.getMemento());
System.out.println("回到状态二:");
user.show();
System.out.println("-----------------------------");
user.restoreMemento(c.getMemento());
System.out.println("回到状态一:");
user.show();
System.out.println("-----------------------------");
}
}
C++代码：
#include<iostream>
#include <list>
using namespace std;
class Memento {
private:
string account;
string password;
string telNo;
public:
string getAccount() {
return account;
}
void setAccount(string account) {
this->account = account;
}
string getPassword() {
return password;
}
void setPassword(string password) {
this->password = password;
}
string getTelNo() {
return telNo;
}
void setTelNo(string telNo) {
this->telNo = telNo;
}
Memento(string account, string password, string telNo) {
this->account = account;
this->password = password;
this->telNo = telNo;
}
};
class UserInfoDTO {
private:
string account;
string password;
string telNo;
public:
string getAccount() {
return account;
}
void setAccount(string account) {
this->account = account;
}
string getPassword() {
return password;
}
void setPassword(string password) {
this->password = password;
}
string getTelNo() {
return telNo;
}
void setTelNo(string telNo) {
this->telNo = telNo;
}
Memento* saveMemento() {
return new Memento(account,password,telNo);
}
void restoreMemento(Memento *memento) {
this->account=memento->getAccount();
this->password=memento->getPassword();
this->telNo=memento->getTelNo();
}
void show() {
cout<<"Account:"<<this->account<<endl;
cout<<"Password:"<<this->password<<endl;
cout<<"TelNo:"<<this->telNo<<endl;
}
};
class Caretaker {
private:
list<Memento*> ll;
public:
Memento* getMemento() {
ll.pop_front();
Memento* mm=ll.front();
return mm;
}
void setMemento(Memento *memento) {
ll.push_front(memento);
}
};
int main(){
UserInfoDTO *user=new UserInfoDTO();
Caretaker *c=new Caretaker();
user->setAccount("zhangsan");
user->setPassword("123456");
user->setTelNo("1310000000");
cout<<"状态一:"<<endl;
user->show();
c->setMemento(user->saveMemento());
cout<<"-----------------------------"<<endl;
user->setPassword("111111");
user->setTelNo("1310001111");
cout<<"状态二:"<<endl;
user->show();
c->setMemento(user->saveMemento());
cout<<"-----------------------------"<<endl;
user->setPassword("zyx666");
user->setTelNo("15733333333");
cout<<"状态三:"<<endl;
user->show();
c->setMemento(user->saveMemento());
cout<<"-----------------------------"<<endl;
user->setPassword("777777");
user->setTelNo("15511111111");
cout<<"状态四:"<<endl;
user->show();
c->setMemento(user->saveMemento());
cout<<"-----------------------------"<<endl;
user->setPassword("666666");
user->setTelNo("17455555555");
cout<<"状态五:"<<endl;
user->show();
c->setMemento(user->saveMemento());
cout<<"-----------------------------"<<endl;
user->restoreMemento(c->getMemento());
cout<<"回到状态四:"<<endl;
user->show();
cout<<"-----------------------------"<<endl;
user->restoreMemento(c->getMemento());
cout<<"回到状态三:"<<endl;
user->show();
cout<<"-----------------------------"<<endl;
user->restoreMemento(c->getMemento());
cout<<"回到状态二:"<<endl;
user->show();
cout<<"-----------------------------"<<endl;
user->restoreMemento(c->getMemento());
cout<<"回到状态一:"<<endl;
user->show();
cout<<"-----------------------------"<<endl;
}
