Channel Decorator (Design patterns)

Main.java

interface Channel {
   void send(String msg); 
   String receive();
}

class TCPChannel implements Channel {
   public void send(String m) {
      System.out.println("Enviando via TCP > " + m);
   }
   public String receive() {
     System.out.println("Recebendo via TCP");
     return "Hello!";
   }
}


class ChannelDecorator implements Channel {
   private Channel channel;
   public ChannelDecorator(Channel channel) {
     this.channel = channel;
   }
   public void send(String m) {
     channel.send(m);
   }
   public String receive() {
     return channel.receive();
   }
}

class ZipChannel extends ChannelDecorator {
   public ZipChannel(Channel c) {
      super(c);
   }
   
   public void send(String m)  {
      System.out.println("Compactando > " + m);
      super.send(m);
   }
   
   public String receive()  {
      String m = super.receive();
      System.out.println("Descompactando < " + m);
      return m;
   }
}

public class Main {
    public static void main(String args[]) {
       Channel c = new ZipChannel(new TCPChannel());
       c.send("Hello, World");
       String r = c.receive();
       System.out.println(r);
    }   
}