在“虚拟聊天室”实例中增加一个新的具体聊天室类和一个新的具体会员类，要求如下：
1. 新的具体聊天室中发送的图片大小不得超过20M。
2. 新的具体聊天室中发送的文字长度不得超过100个字符。
3. 新的具体会员类可以发送图片信息和文本信息。
4. 新的具体会员类在发送文本信息时，可以在信息后加上时间。
修改客户端测试类，注意原有系统类代码和客户端代码的修改。
实验要求：
1. 提交源代码；
package Intermediary_model;
public abstract class AbstractChatroom {
public abstract void register(Member m);
public abstract void sendtext(String a,String b,String mess);
public abstract void sendimage(String a,String b,String mess);
}
package Intermediary_model;
import java.util.*;
public class ChatGroup extends AbstractChatroom{
private Hashtable ms=new Hashtable();
public void register(Member m)
{
if(!ms.contains(m)){
ms.put(m.getname(),m);
m.setroom(this);
}
}
public void sendtext(String a,String b,String c){
Member m=(Member)ms.get(b);
String newm=c;
newm=c.replaceAll("日","*");
m.receivetext(a,newm);
}
public void sendimage(String a,String b,String c){
Member m=(Member)ms.get(b);
if(c.length()>5){
System.out.println("图片较大，发送失败");
}else{
m.receiveimage(a,c);
}
}
}
package Intermediary_model;
public class CommonMember extends Member{
public CommonMember(String a){
super(a);
}
public void sendtext(String a,String c){
System.out.println("普通会员发送消息");
room.sendtext(name,a,c);
}
public void sendimage(String a,String c){
System.out.println("普通会员不能发送图片");
}
}
package Intermediary_model;
public class DiamondMember extends Member{
public DiamondMember(String a){
super(a);
}
public void sendtext(String a,String c){
System.out.println("钻石会员发送消息");
room.sendtext(name,a,c);
}
public void sendimage(String a,String c){
System.out.println("钻石会员发送图片");
room.sendimage(name,a,c);
}
}
package Intermediary_model;
public class main {
public static void main(String args[]){
AbstractChatroom r1=new NewGroup();
Member m1,m2,m3;
m1=new NewMember("小张");
m2=new NewMember("小王");
m3=new NewMember("小李");
r1.register(m1);
r1.register(m2);
r1.register(m3);
m1.sendtext("小张","：小张，你好");
m2.sendtext("小王","：小王，你好");
m1.sendtext("小张","：你在家吗？");
m2.sendtext("小王","：在");
m1.sendtext("小李","：---------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
m3.sendimage("小王","：你好.jpg");
m2.sendimage("小李","：你好.jpg--------------------");
}
}
package Intermediary_model;
public abstract class Member {
protected AbstractChatroom room;
protected String name;
public Member(String a){
name=a;
}
public String getname(){
return name;
}
public void setname(String a){
name=a;
}
public AbstractChatroom getroom(){
return room;
}
public void setroom(AbstractChatroom a){
room=a;
}
public abstract void sendtext(String a,String mess);
public abstract void sendimage(String a,String image);
public void receivetext(String a,String mess){
System.out.println(a+"发送的给"+name+"内容是"+mess);
}
public void receiveimage(String a,String image){
System.out.println(a+"发送的给"+name+"内容是"+image);
}
}
package Intermediary_model;
import java.util.HashMap;
import java.util.Map;
public class NewGroup extends AbstractChatroom{
Map<String,Member> table = new HashMap<>();
public void register(Member member) {
table.put(member.getname(), member);
member.setroom(this);
}
public void sendtext(String from, String to, String message) {
if(message.length()>=100){
System.out.println("超过100个字符，发送失败");
}else{
Member member = table.get(to);
if(member!=null)
member.receivetext(from, message);
}
}
public void sendimage(String from, String to, String message) {
if(message.length()>=20){
System.out.println("图片超过20M，发送失败");
}else{
Member member = table.get(to);
if(member!=null)
member.receiveimage(from, message);
}
}
}
package Intermediary_model;
public class NewMember extends Member{
public NewMember(String a){
super(a);
}
public void sendtext(String a,String c){
System.out.println("新会员发送消息：");
room.sendtext(name,a,c);
}
public void sendimage(String a,String c){
System.out.println("新会员发送图片：");
room.sendimage(name,a,c);
}
}
2. 注意编程规范。