[实验任务一]：虚拟聊天室
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。

1. 提交源代码；

2.	//Member.java
package shiyan19;

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);
    }
}
//CommonMember.java
package shiyan19;


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");
    }
}
//DiamondMember.java
package shiyan19;

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);
    }
}
//NewGroup.java
package shiyan19;

        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);
        }
    }

}
//NewMember.java
package shiyan19;

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);
    }
}
//AbstractChatroom.java
package shiyan19;

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);
}
//ChatGroup.java
package shiyan19;

        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);
        }
    }
}
//main.java
package shiyan19;

public class main {
    public static void main(String args[]){
        AbstractChatroom r1=new NewGroup();
        Member m1,m2,m3;
        m1=new NewMember("张三");
        m2=new NewMember("李四");
        m3=new NewMember("王五");
        r1.register(m1);
        r1.register(m2);
        r1.register(m3);
        m1.sendtext("张三","：好啊呦");
        m2.sendtext("李四","：饭，三克油，安的有");
        m1.sendtext("王五","：耶，米兔");
        m2.sendtext("李四","：哈哈");
        m1.sendtext("王五","：哈哈");
        m3.sendimage("张三","：666");
        m2.sendimage("王五","：666");
    }
}

2. 注意编程规范。