类图

 

 

源码

AbChatroom.java
package com.demo;

public abstract class AbChatroom {
    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);
}
Diamondmember.java
package com.demo;

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);
    }
}
Group.java
package com.demo;

import java.util.Hashtable;

public class Group extends AbChatroom{
    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);
        }
    }
}

Member.java
package com.demo;

public abstract class Member {
    protected AbChatroom room;
    protected String name;
    public Member(String a){
        name=a;
    }
    public String getname(){
        return name;
    }
    public void setname(String a){
        name=a;
    }
    public AbChatroom getroom(){
        return room;
    }
    public void setroom(AbChatroom 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);
    }
}

Newmember.java
package com.demo;

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("新会员不能发送图片");
        room.sendimage(name,a,c);
    }
}
Ordinary.java
package com.demo;

public class Ordinary extends Member{
    public Ordinary(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");
    }
}


Room.java
package com.demo;

import java.util.HashMap;
import java.util.Map;
public class Room extends AbChatroom{

        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.err.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.err.println("图片超过20M，发送失败");
            }else{
                Member member = table.get(to);
                if(member!=null)
                    member.receiveimage(from, message);
            }
        }

}

Client.java
package com.demo;

public class Client {
    public static void main(String args[]){
        AbChatroom r1=new Room();
        Member m1,m2,m3;
        m1=new Newmember("A");
        m2=new Newmember("B");
        m3=new Newmember("C");
        r1.register(m1);
        r1.register(m2);
        r1.register(m3);
        m1.sendtext("B","：<Message1>");
        m2.sendtext("A","：<Message2>");
        m2.sendtext("A","：<Message3>");
        m3.sendimage("A","：<jpg1>");
        m3.sendimage("B","：<jpg2>");
        
    }
}

 

 

测试截图