软件设计装饰模式

手机功能的升级
用装饰模式模拟手机功能的升级过程：简单的手机(SimplePhone)在接收来电时，会发出声音提醒主人；而JarPhone除了声音还能振动；更高级的手机(ComplexPhone)除了声音、振动外，还有灯光闪烁提示。

类图

java

package rjsj.no11;

public class Client {
    public static void main(String[] args) {
        CellPhone phone1 = new SimplePhone();
        CellPhone phone2 = new JarPhone(phone1);
        CellPhone phone3 = new ComplexPhone(phone2);
        phone1.receiveCall();
        System.out.println("********************************************************************************");
        phone2.receiveCall();
        System.out.println("********************************************************************************");
        phone3.receiveCall();
    }
}

package rjsj.no11;

public class ComplexPhone extends PhoneDecorator{
    public ComplexPhone(CellPhone cellPhone) {
        super(cellPhone);
    }

    @Override
    public void receiveCall() {
        super.receiveCall();
        System.out.println("闪光灯闪烁");
    }
}

package rjsj.no11;

public class JarPhone extends PhoneDecorator{
    public JarPhone(CellPhone cellPhone) {
        super(cellPhone);
    }

    @Override
    public void receiveCall() {
        super.receiveCall();
        System.out.println("发出震动");
    }
}

package rjsj.no11;

public class PhoneDecorator extends CellPhone{

    private CellPhone cellPhone = null;

    public PhoneDecorator(CellPhone cellPhone){
        if (cellPhone != null){
            this.cellPhone = cellPhone;
        } else {
            this.cellPhone = new SimplePhone();
        }
    }

    @Override
    public void receiveCall() {
        cellPhone.receiveCall();
    }
}

package rjsj.no11;

public class SimplePhone extends CellPhone{
    @Override
    public void receiveCall() {
        System.out.println("发出声音");
    }
}

package rjsj.no11;

abstract class CellPhone {
    public abstract void receiveCall();
}

C++

#include <iostream>
using namespace std;

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

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

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

class SimplePhone:public Phone{
public:
    virtual void receiveCall(){
        cout<<"发出声音"<<endl;
    }
};


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

class ComplexPhone:public PhoneDecorator{
public:
    ComplexPhone(Phone *p):PhoneDecorator(p){}
    void receiveCall(){
        phone->receiveCall();
        cout<<"闪光灯"<<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;
}

运行截图：