备忘录模式

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package memento;/*** * 源发器 * @author zw * */public class Emp {private String name;private int age;private double salary;//进行备忘录操作，并且返回备忘录对象public EmpMemento memento() {return new EmpMemento(this);}//从备忘录恢复数据public void recovery(EmpMemento emp) {this.name = emp.getName();this.age = emp.getAge();this.salary  = emp.getSalary();}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public double getSalary() {return salary;}public void setSalary(double salary) {this.salary = salary;}public Emp(String name, int age, double salary) {super();this.name = name;this.age = age;this.salary = salary;}}

package memento;/*** * 备忘录类 * @author zw * */public class EmpMemento {private String name;private int age;private double salary;//存储到备忘录下public EmpMemento(Emp e) {this.name = e.getName();this.age = e.getAge();this.salary = e.getSalary();}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public double getSalary() {return salary;}public void setSalary(double salary) {this.salary = salary;}}

package memento;/** * 负责人 * 负责管理备忘录对象 * @author zw * */public class CarTaker {private EmpMemento emp;public EmpMemento getEmp() {return emp;}public void setEmp(EmpMemento emp) {this.emp = emp;}}

package memento;public class Client {public static void main(String[] args) {CarTaker ct = new CarTaker();Emp emp = new Emp("javazhangwei",18, 5000000);System.out.println("第一次打印："+emp.getName()+"---"+emp.getAge()+"---"+emp.getSalary());ct.setEmp(emp.memento());emp.setAge(19);emp.setName("张伟");emp.setSalary(10000000);System.out.println("第二次打印："+emp.getName()+"---"+emp.getAge()+"---"+emp.getSalary());emp.recovery(ct.getEmp());//恢复备忘录System.out.println("第三 次打印："+emp.getName()+"---"+emp.getAge()+"---"+emp.getSalary());}}

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