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。
Java源代码：
1 //Member.java
2 package shiyan19;
3
4 public abstract class Member {
5 protected AbstractChatroom room;
6 protected String name;
7 public Member(String a){
8 name=a;
9 }
10 public String getname(){
11 return name;
12 }
13 public void setname(String a){
14 name=a;
15 }
16 public AbstractChatroom getroom(){
17 return room;
18 }
19 public void setroom(AbstractChatroom a){
20 room=a;
21 }
22 public abstract void sendtext(String a,String mess);
23 public abstract void sendimage(String a,String image);
24 public void receivetext(String a,String mess){
25 System.out.println(a+"发送的给"+name+"内容是"+mess);
26 }
27 public void receiveimage(String a,String image){
28 System.out.println(a+"发送的给"+name+"内容是"+image);
29 }
30 }
31 //CommonMember.java
32 package shiyan19;
33
34
35 public class CommonMember extends Member{
36 public CommonMember(String a){
37 super(a);
38 }
39 public void sendtext(String a,String c){
40 System.out.println("普通会员发送消息");
41 room.sendtext(name,a,c);
42 }
43 public void sendimage(String a,String c){
44 System.out.println("普通会员不能发送图片");
45 }
46 }
47 //DiamondMember.java
48 package shiyan19;
49
50 public class DiamondMember extends Member{
51 public DiamondMember(String a){
52 super(a);
53 }
54 public void sendtext(String a,String c){
55 System.out.println("钻石会员发送消息");
56 room.sendtext(name,a,c);
57 }
58 public void sendimage(String a,String c){
59 System.out.println("钻石会员发送图片");
60 room.sendimage(name,a,c);
61 }
62 }
63 //NewGroup.java
64 package shiyan19;
65
66 import java.util.HashMap;
67 import java.util.Map;
68 public class NewGroup extends AbstractChatroom{
69
70 Map<String,Member> table = new HashMap<>();
71 public void register(Member member) {
72 table.put(member.getname(), member);
73 member.setroom(this);
74 }
75
76 public void sendtext(String from, String to, String message) {
77 if(message.length()>=100){
78 System.out.println("超过100个字符，发送失败");
79 }else{
80 Member member = table.get(to);
81 if(member!=null)
82 member.receivetext(from, message);
83 }
84 }
85
86 public void sendimage(String from, String to, String message) {
87 if(message.length()>=20){
88 System.out.println("图片超过20M，发送失败");
89 }else{
90 Member member = table.get(to);
91 if(member!=null)
92 member.receiveimage(from, message);
93 }
94 }
95
96 }
97 //NewMember.java
98 package shiyan19;
99
100 public class NewMember extends Member{
101 public NewMember(String a){
102 super(a);
103 }
104 public void sendtext(String a,String c){
105 System.out.println("新会员发送消息：");
106 room.sendtext(name,a,c);
107 }
108 public void sendimage(String a,String c){
109 System.out.println("新会员发送图片：");
110 room.sendimage(name,a,c);
111 }
112 }
113 //AbstractChatroom.java
114 package shiyan19;
115
116 public abstract class AbstractChatroom {
117 public abstract void register(Member m);
118 public abstract void sendtext(String a,String b,String mess);
119 public abstract void sendimage(String a,String b,String mess);
120 }
121 //ChatGroup.java
122 package shiyan19;
123
124 import java.util.*;
125
126 public class ChatGroup extends AbstractChatroom{
127 private Hashtable ms=new Hashtable();
128 public void register(Member m)
129 {
130 if(!ms.contains(m)){
131 ms.put(m.getname(),m);
132 m.setroom(this);
133 }
134 }
135 public void sendtext(String a,String b,String c){
136 Member m=(Member)ms.get(b);
137 String newm=c;
138 newm=c.replaceAll("日","*");
139 m.receivetext(a,newm);
140 }
141 public void sendimage(String a,String b,String c){
142 Member m=(Member)ms.get(b);
143 if(c.length()>5){
144 System.out.println("图片较大，发送失败");
145 }else{
146 m.receiveimage(a,c);
147 }
148 }
149 }
150 //main.java
151 package shiyan19;
152
153 public class main {
154 public static void main(String args[]){
155 AbstractChatroom r1=new NewGroup();
156 Member m1,m2,m3;
157 m1=new NewMember("小李");
158 m2=new NewMember("小红");
159 m3=new NewMember("张三");
160 r1.register(m1);
161 r1.register(m2);
162 r1.register(m3);
163 m1.sendtext("小红","：小红，你好");
164 m2.sendtext("小李","：小李，你好");
165 m1.sendtext("小红","：吃饭了吗？");
166 m2.sendtext("小李","：吃了");
167 m1.sendtext("张三","：---------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
168 m3.sendimage("小李","：哈哈.jpg");
169 m2.sendimage("张三","：哈哈.jpg--------------------");
170 }
171 }