设计模式 |备忘录模式（memento）

package designpattern.memento;

public class Student {
    private String name;// 姓名
    private String major;// 专业
    private String studentNo;// 学号

    public Student(String name, String major, String studentNo) {
        super();
        this.name = name;
        this.major = major;
        this.studentNo = studentNo;
    }

    public Memento createMemento() {
        return new Memento(this.name, this.major);
    }

    public void restoreMemento(Memento memento) {
        this.name = memento.getName();
        this.major = memento.getMajor();
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major;
    }

    public String getStudentNo() {
        return studentNo;
    }

    public void setStudentNo(String studentNo) {
        this.studentNo = studentNo;
    }

    @Override
    public String toString() {
        return "Student [name=" + name + ", major=" + major + ", studentNo=" + studentNo + "]";
    }

}

package designpattern.memento;

public class Memento {
    private String name;
    private String major;

    public Memento(String name, String major) {
        super();
        this.name = name;
        this.major = major;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major;
    }

}

package designpattern.memento;

public class CareTaker {
    private Memento memento;

    public Memento getMemento() {
        return memento;
    }

    public void setMemento(Memento memento) {
        this.memento = memento;
    }

}

package designpattern.memento;

public class Client {
    public static void main(String[] args) {
        Student student = new Student("郝鑫仁", "计算机", "1234");
        CareTaker careTaker = new CareTaker();
        careTaker.setMemento(student.createMemento());
        System.out.println(student);

        System.out.println("开始点名...");

        // 伪装成其他同学
        student.setName("齐步莱");
        student.setMajor("自动化");
        System.out.println(student);

        System.out.println("点名结束");

        // 变回自己
        student.restoreMemento(careTaker.getMemento());
        System.out.println(student);

    }
}

Student [name=郝鑫仁, major=计算机, studentNo=1234]
开始点名...
Student [name=齐步莱, major=自动化, studentNo=1234]
点名结束
Student [name=郝鑫仁, major=计算机, studentNo=1234]