装饰者模式

 public abstract class MobilePhone
 {
     public String phoneName;
     public abstract void SendMessage();
     public abstract void Call();
 }

//MiPhone:
public class MiPhone extends MobilePhone
{

    public MiPhone()
    {
        phoneName="MiPhone";
    }
    public void SendMessage() 
    {
        System.out.println( phoneName+"‘s SendMessage." );
    }

    public void Call() 
    {
        System.out.println( phoneName+"‘s Call.");
    }

}

//iPhone
public class iPhone extends MobilePhone
{

    public iPhone()
    {
        phoneName="iPhone";
    }
    public void SendMessage() 
    {
        System.out.println( phoneName+"‘s SendMessage." );
    }

    public void Call() 
    {
        System.out.println( phoneName+"‘s Call.");
    }

}

public class Decorator extends MobilePhone
{
    private MobilePhone _mobilePhone;
    
    public Decorator(MobilePhone mobilePhone)
    {
        _mobilePhone=mobilePhone;
        phoneName=mobilePhone.phoneName;
    }
    public void SendMessage()
    {
        _mobilePhone.SendMessage();
    }

    public void Call() 
    {
        _mobilePhone.Call();
    }

}

public class Bluetooth extends Decorator//Bluetooth
{
    public Bluetooth(MobilePhone mobilePhone) 
    {
        super(mobilePhone);
    }
    
    public void Connect()
    {
        System.out.println( phoneName+"增加蓝牙功能。" );
    }

}

public class GPS extends Decorator//GPS
{
    public GPS(MobilePhone mobilePhone)
    {
        super(mobilePhone);
    }

    public String Location;

}

public class Camera extends Decorator//Camera 
{
    public Camera(MobilePhone mobilePhone)
    {
        super(mobilePhone);
    }

    public void VideoCall()
    {
        System.out.println(phoneName+"增加视频电话功能。");
    }
}

public class Main
 {
    public static void main(String[] args)
    {
        MiPhone miPhone=new MiPhone();
        iPhone iphone=new iPhone();
        
        Bluetooth miBluetooth=new Bluetooth(miPhone);
        miBluetooth.Connect();
        GPS miGPS=new GPS(miPhone);
        miGPS.Location="MiPhone的定位成功";
        System.out.println(miGPS.Location);
        Camera miCamera=new Camera(miPhone);
        miCamera.VideoCall();
        
        Bluetooth iBluetooth=new Bluetooth(iphone);
        iBluetooth.Connect();
        GPS iGPS=new GPS(iphone);
        miGPS.Location="iPhone的定位成功";
        System.out.println(miGPS.Location);
        Camera iCamera=new Camera(iphone);
        iCamera.VideoCall();
    }

}