2024/11/27

软件设计实验二十

[实验任务一]：多次撤销

改进课堂上的“用户信息操作撤销”实例，使得系统可以实现多次撤销（可以使用HashMap、ArrayList等集合数据结构实现）。

实验要求：

1.      画出对应的类图；

 

2.      提交源代码；

public class Memento {

    private String account;

    private String password;

    private String telephone;

    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 getTelephone() {

        return telephone;

    }

    public void setTelephone(String telephone) {

        this.telephone = telephone;

    }

    public Memento(String account, String password, String telephone) {

        this.account = account;

        this.password = password;

        this.telephone = telephone;

    }

}

 

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 UserInfo {

    private String account;

    private String password;

    private String telephone;

    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 getTelephone() {

        return telephone;

    }

    public void setTelephone(String telephone) {

        this.telephone = telephone;

    }

 

    public Memento saveMemento() {

        return new Memento(account,password,telephone);

    }

    public void restoreMemento(Memento memento) {

        this.account=memento.getAccount();

        this.password=memento.getPassword();

        this.telephone=memento.getTelephone();

    }

    public void show() {

        System.out.println("账号:"+this.account);

        System.out.println("密码:"+this.password);

        System.out.println("电话号码:"+this.telephone);

    }

}

 

public class App

{

    public static void main( String[] args )

    {

        // TODO Auto-generated method stub

        UserInfo user=new UserInfo();

        Caretaker c=new Caretaker();

 

        user.setAccount("gonghanbin");

        user.setPassword("ghb188");

        user.setTelephone("180xxxx9148");

        System.out.println("状态一:");

        user.show();

        c.setMemento(user.saveMemento());

        System.out.println("++++++++++++++++++++++++++++++");

 

        user.setPassword("gonghanbin188");

        user.setTelephone("188xxxx3768");

        System.out.println("状态二:");

        user.show();

        c.setMemento(user.saveMemento());

        System.out.println("++++++++++++++++++++++++++++++");

 

        user.setPassword("gonghanbin666");

        user.setTelephone("188xxxx9148");

        System.out.println("状态三:");

        user.show();

        c.setMemento(user.saveMemento());

        System.out.println("++++++++++++++++++++++++++++++");

 

        user.setPassword("gonghanbin");

        user.setTelephone("180xxxx3768");

        System.out.println("状态四:");

        user.show();

        c.setMemento(user.saveMemento());

        System.out.println("++++++++++++++++++++++++++++++");

 

        user.setPassword("ghb666");

        user.setTelephone("xxxxxxxxx");

        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("++++++++++++++++++++++++++++++");

    }

}