用裝飾模式模擬手機功能的升級過程：簡單的手機(SimplePhone)在接收來電時，會發出聲音提醒主人；而JarPhone除了聲音還能振動；更高階的手機(ComplexPhone)除了聲音、振動外，還有燈光閃爍提示。

類圖：

Java程式碼：

public class Changer implements Phone{

    private Phone phone;
    public Changer(Phone p) {
        this.phone=p;
    }
    public void voice() {
        phone.voice();
    }
}

 
public class ComplexPhone extends Changer{

    public ComplexPhone(Phone p) {
        super(p);
        System.out.println("ComplexPhone");
    }

    public void zhendong() {
        System.out.println("會震動！");
    }
    public void dengguang() {
        System.out.println("會發光！");
    }

}


public
 
 class JarPhone extends Changer{

    public JarPhone(Phone p) {
        super(p);
        System.out.println("Jarphone");
    }

    public void zhendong() {
        System.out.println("會震動！");
    }
}

public interface Phone {
    public void voice();
}

public class SimplePhone implements Phone{

     
 
public void voice() {
            System.out.println("發出聲音！");
        }

}

public class Client {
    public static void main(String[] args) {
        Phone phone;
        phone=new SimplePhone();
        phone.voice();
        JarPhone jarphone=new JarPhone(phone);
        jarphone.voice();
        jarphone.zhendong();
        ComplexPhone complexphone = new ComplexPhone(phone);
        complexphone.zhendong();
        complexphone.dengguang();
    }
}

C++程式碼：

#include <iostream>
using namespace std;

class Phone
{
public:
    virtual void receiveCall(){};
};

class SimplePhone:public Phone
{
public:
    virtual void receiveCall(){
        cout<<"發出聲音!"<<endl;
    }
};


class PhoneDecorator:public Phone {
protected:
    Phone *phone;

public:
    PhoneDecorator(Phone *p)
    {
        phone=p;
    }
    virtual void receiveCall()
    {
        phone->receiveCall();
    }
};


class JarPhone:public PhoneDecorator{
public:
    JarPhone(Phone *p):PhoneDecorator(p){}
    void receiveCall()
    {
        phone->receiveCall();
        cout<<"會震動！"<<endl;
    }
};

class ComplexPhone:public PhoneDecorator{
public:
    ComplexPhone(Phone *p):PhoneDecorator(p){}
    void receiveCall()
    {
        phone->receiveCall();
        cout<<"會發光！"<<endl;
    }
};

int main()
{
    Phone *p1=new SimplePhone();
    p1->receiveCall();
    cout<<"Jarphone"<<endl;
    Phone *p2=new JarPhone(p1);
    p2->receiveCall();
    cout<<"ComplexPhone"<<endl;
    Phone *p3=new ComplexPhone(p2);
    p3->receiveCall();
    return 0;
}

執行結果：