设计模式快速参考－组合模式

abstract class Hardware{
}

class Mainboard extends Hardware{
}

class Memory extends Hardware{
}

class Display extends Hardware(
}

class NetworkAdapter extends Hardware{
}
class Computer extends Hardware[
   private List parts = new Arraylist();
   public List add(Hardware hardware){
      parts.add(hardware);
      return parts;
   }
}

 

Client：

 

Computer computer = new Computer();
Mainboard mainboard = new Mainboard();
NetworkAdapter networkAdapter = new NetworkAdapter();
Display display = new Display();
Memory memory = new Memory();
computer .add(mainboad)
         .add(networkAdapter)
         .add(display)
         .add(memory);