设计模式十七

1、高级语言程序设计实验指导书一实验目的1. 熟悉UML统一建模语言；2. 回顾熟悉迭代器模式、中介者模式、备忘录模式；3. 熟悉XML文件的操作；4. 熟悉java的反射机制。二实验内容(1)某教务管理系统中一个班级(Class)包含多个学生(Student)，使用Java内置迭代器实现对学生信息的遍历，要求按学生年龄由大到小的次序输出学生信息。用Java实现该过程。(2)使用中介者模式来说明联合国的作用，要求绘制相应的类图并分析每个类的作用（注：可以将联合国定义为抽象中介者类，联合国下属机构如WTO、WFC、WHO等作为具体中介者类，国家可以作为抽象同事类，而将中国、美国、日本、英国等国家作为

2、具体同事类）。(3)改进“用户信息操作撤销”实例，使得系统可以实现多次撤销操作（可以使用集合对象如HashMap、ArrayList等来实现）。三实验环境PC微机；Windows 操作系统；Visual Studio 程序集成环境。4 实验内容(1)某教务管理系统中一个班级(Class)包含多个学生(Student)，使用Java内置迭代器实现对学生信息的遍历，要求按学生年龄由大到小的次序输出学生信息。用Java实现该过程。Student.javapackage 设计模式实验十七周_1;public class Student implements Comparable<Student&

3、gt; private String no; private String name; private int age; private String zy; public Student(String no, String name, int age, String zy) super(); this.no = no; = name; this.age = age; this.zy = zy; / 三个返回结果都要写出来 public int compareTo(Student o) if(this.age > o.age) return -1; else if(t

4、his.age < o.age) return 1; else return 0; Override public String toString() return "姓名: " + + ". 编号: " + this.no + ". 年龄: " + this.age + ". 专业: " + this.zy; Client.javapackage 设计模式实验十七周_1;import java.util.ArrayList;import java.util.Collections;imp

5、ort java.util.List;public class Client public static void main(String args) Student s1 = new Student("291", "张一", 20, "音乐专业"); Student s2 = new Student("423", "李红", 21, "计算机专业"); Student s3 = new Student("211", "王文", 22,

6、 "机械专业"); Student s4 = new Student("445", "高龙", 19, "国贸专业"); List<Student> list = new ArrayList<Student>(); list.add(s1); list.add(s2); list.add(s3); list.add(s4); Collections.sort(list); System.out.println("按照年龄进行排序输出: "); for(Student st

7、u : list) System.out.println(stu.toString(); UML.java 运行结果：(2)使用中介者模式来说明联合国的作用，要求绘制相应的类图并分析每个类的作用（注：可以将联合国定义为抽象中介者类，联合国下属机构如WTO、WFC、WHO等作为具体中介者类，国家可以作为抽象同事类，而将中国、美国、日本、英国等国家作为具体同事类）。UN.javapackage 设计模式实验十七周_2;import java.util.Hashtable;public abstract class UN protected String name;protected Hashtab

8、le<String, Country> country;public String getName() return name;public void setName(String name) = name;public UN() this.country = new Hashtable<String, Country>();public void AddCountry(Country co) if (country = null)return;country.put(co.getName(), co);public void DelCountry(

9、String co) if (country = null)return;country.remove(co);public void DelCountry(Country co) if (country = null)return;country.remove(co.getName();protected void SendMessage(String from, String to, String msg) Country co = country.get(to);if (co != null)co.ReceiveMessage(from, msg);elseSystem.out.prin

10、tln("对不起！“" + from + "”不存在，可能还未加入UN!");public void ReceiveMessage(String from, String to, String msg) SendMessage(from, to, msg);Country.javapackage 设计模式实验十七周_2;public abstract class Country protected String name;protected UN wto, who, wfc;public UN getWto() return wto;public voi

11、d setWto(UN wto) this.wto = wto;public UN getWho() return who;public void setWho(UN who) this.who = who;public UN getWfc() return wfc;public void setWfc(UN wfc) this.wfc = wfc;public String getName() return name;public void setName(String name) = name;public abstract void SendMessageByWTO(

12、String cou, String msg);public void SendMessageByWHO(String cou, String msg) who.SendMessage(, cou, msg);public void SendMessageByWFC(String cou, String msg) wfc.SendMessage(, cou, msg);public void ReceiveMessage(String cou, String msg) System.out.println(name + "收到来自" +

13、cou + "的消息：“" + msg + "”");Overridepublic boolean equals(Object co) Country c = (Country) co;if (co = null | = null | c.getName() = null)return false;return name.equals(c.getName();WHO.javapackage 设计模式实验十七周_2;public class WHO extends UN public WHO()super();=new

14、 String("WHO");WFC.javapackage 设计模式实验十七周_2;public class WFC extends UN public WFC() super(); = new String("WFC");WTO.javapackage 设计模式实验十七周_2;public class WTO extends UN public WTO() super(); = new String("WTO");America.javapackage 设计模式实验十七周_2;public cl

15、ass America extends Country public America()=new String ("America");Overridepublic void SendMessageByWTO(String cou, String msg) wto.SendMessage(, cou, msg);China.javapackage 设计模式实验十七周_2;public class China extends Country public China()=new String("China&quo

16、t;);Overridepublic void SendMessageByWTO(String cou, String msg) wto.SendMessage(, cou, msg);Japan.javapackage 设计模式实验十七周_2;public class Japan extends Country public Japan()=new String ("Japan");Overridepublic void SendMessageByWTO(String cou, String msg) wto.SendMessage(t

17、, cou, msg);Client.javapackage 设计模式实验十七周_2;public class Client public static void main(String args) UN un=new UN3;/UN wto,who,wfc;un0=new WTO();un1=new WHO();un2=new WFC();Country cou=new Country3;cou0=new China();cou1=new Japan();cou2=new America();for(int i=0;i<un.length;i+)for(int j=0;

18、j<cou.length;j+)uni.AddCountry(couj);for(int i=0;i<cou.length;i+)coui.setWfc(un2);coui.setWho(un1);coui.setWto(un0);cou0.SendMessageByWTO("America", "中方坚决反对美方干涉台湾问题");cou1.SendMessageByWHO("China","通过WHO.");cou2.SendMessageByWFC("China", "

19、通过WFC.");UML.java运行结果：(3)改进“用户信息操作撤销”实例，使得系统可以实现多次撤销操作（可以使用集合对象如HashMap、ArrayList等来实现）。UserInfoDTO.javapackage 设计模式实验十七周_3;public class UserInfoDTO private String account; private String password; private String telNo; public String getAccount() return account; public void setAccount(String acc

20、ount) 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

21、); 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.prin

22、tln("TelNo:" + this.telNo); Caretaker.javapackage 设计模式实验十七周_3;public class Caretaker private Memento memento; public Memento getMemento() return memento; public void setMemento(Memento memento) this.memento=memento; Memento.javapackage 设计模式实验十七周_3;class Memento private String account; priv

23、ate 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() r

24、eturn password; public void setPassword(String password) this.password=password; public String getTelNo() return telNo; public void setTelNo(String telNo) this.telNo=telNo; Client.javapackage 设计模式实验十七周_3;import 设计模式实验十七周_3.UserInfoDTO;import 设计模式实验十七周_3.Caretaker;public class Client public static void main(String a) UserInfoDTO user=new UserInfoDTO(); Caretaker c=new Caretaker(); Caretaker d=new Caretaker(); user.setAccount("zhangsan"); user.setPassword("123456