番外-软件设计（16）

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. 提交源代码；

package Memorandum_mode;

 

public class Caretaker

{

    private Memento[] array = null;

    private int index;

    private Memento memento;

    public Memento getMemento()

    {

        return memento;

    }

    public void setMemento(Memento memento)

    {

        this.memento=memento;

    }

    public Caretaker(){

        array = new Memento[10];

        index = 0;

    }

    public void addMemento(Memento Memento){

        array[index++] = Memento;

    }

    public Memento preMemento(){

        Memento pop = null;

        try {

            pop = array[--index];

        } catch (Exception e) {

            e.printStackTrace();

        }

        return pop;

    }

}

package Memorandum_mode;

 

public class main {

    public static void main(String args[]) {

        UserInfoDTO user = new UserInfoDTO();

        Caretaker c = new Caretaker();

        user.setAccount("zhangrong");

        user.setPassword("123456");

        user.setTelNo("130000");

        System.out.println("状态一：");

        user.show();

        c.addMemento(user.saveMemento());

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

 

        user.setPassword("000000");

        user.setTelNo("130111");

        System.out.println("状态二：");

        user.show();

        c.addMemento(user.saveMemento());

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

 

        user.setPassword("111111");

        user.setTelNo("130222");

        System.out.println("状态三：");

        user.show();

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

 

        user.restoreMemento(c.preMemento());

        System.out.println("回到状态二：");

        user.show();

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

 

        user.restoreMemento(c.preMemento());

        System.out.println("回到状态一：");

        user.show();

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

    }

}

package Memorandum_mode;

 

class Memento

{

    private String account;

    private String password;

    private String telNo;

    public Memento(String account,String password,String telNo)

    {

        this.account=account;

        this.password=password;

        this.telNo=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;

    }

}

package Memorandum_mode;

 

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("账号是" + this.account);

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

        System.out.println("电话是" + this.telNo);

    }

}

2. 注意编程规范。