设计模式——装饰模式

一、任务

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。

二、类图

三、代码

1、Java

package tutorial11;

public class Client {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根

          Phone p1 = new SimplePhone();
          System.out.println("生产简单手机");
          p1.serviceCall();
          
          System.out.println("***********************");
          Phone p2 = new JarPhone(p1);
          System.out.println("升级手机为JarPhone");
          p2.serviceCall();
          System.out.println("***********************");
          Phone p3 = new ComplexPhone(p2);
          System.out.println("升级手机为ComplexPhone");
          p3.serviceCall();
    }

}

package tutorial11;

public abstract class Phone {

    public void serviceCall() {
        
    }
}

package tutorial11;

public class SimplePhone extends Phone {

    public void serviceCall() {
        System.out.println("SimplePhone：发出声音提醒主人电话来了");
    }
}

package tutorial11;

public class PhoneDecoration extends Phone {

    private Phone phone=null;
    public PhoneDecoration(Phone phone) {
          if(phone!=null){
                 this.phone = phone;
             }else{
                 this.phone = new SimplePhone();
             }
    }
    @Override
    public void serviceCall() {
        phone.serviceCall();
    }
}

package tutorial11;

public class JarPhone extends PhoneDecoration {

    public JarPhone(Phone phone) {
        super(phone);
        // TODO 自动生成的构造函数存根
    }
    @Override
    public void serviceCall() {
        super.serviceCall();
        System.out.println("JarPhone：发出声音并震动提醒主人电话来了");
    }
    

}

package tutorial11;

public class ComplexPhone extends PhoneDecoration {

    public ComplexPhone(Phone phone) {
        super(phone);
        // TODO 自动生成的构造函数存根
    }
    @Override
    public void serviceCall() {
        super.serviceCall();
        System.out.println("ComplexPhone：发出声音、震动并灯光闪烁提醒主人电话来了");
    }
    

}

2、C++

#include <iostream>
#include <string>
#include <list>
using namespace std;

class Phone
{
public:
    Phone() {}
    virtual ~Phone() {}
    virtual void ShowDecorate() {}
};
//具体的手机类
class SimplePhone : public Phone
{
private:
    string namePhone;
public:
    SimplePhone(string name) : namePhone(name) {}
    ~SimplePhone() {}
    void ShowDecorate() { 
        cout  <<endl<<namePhone << ":" << endl; 
    }
};
//装饰类
class DecoratorPhone : public Phone
{
private:
    Phone* m_phone;  //要装饰的手机
public:
    DecoratorPhone(Phone* phone) : m_phone(phone) {}
    virtual void ShowDecorate() { m_phone->ShowDecorate(); }
};
//具体的装饰类
class DecoratorPhoneA : public DecoratorPhone
{
public:
    DecoratorPhoneA(Phone* phone) : DecoratorPhone(phone) {}
    void ShowDecorate() { DecoratorPhone::ShowDecorate(); AddDecorate(); }
private:
    void AddDecorate() { cout << "发出声音提示主人电话来了" << endl; } //增加的装饰
};
//具体的装饰类
class DecoratorPhoneB : public DecoratorPhone
{
public:
    DecoratorPhoneB(Phone* phone) : DecoratorPhone(phone) {}
    void ShowDecorate() { DecoratorPhone::ShowDecorate(); AddDecorate(); }
private:
    void AddDecorate() { cout << "震动提示主人电话来了" << endl; } //增加的装饰
};
//具体的装饰类
class DecoratorPhoneC : public DecoratorPhone
{
public:
    DecoratorPhoneC(Phone* phone) : DecoratorPhone(phone) {}
    void ShowDecorate() { DecoratorPhone::ShowDecorate(); AddDecorate(); }
private:
    void AddDecorate() { cout << "闪烁灯光提示主人电话来了" << endl; } //增加的装饰
};
int main()
{
    Phone* iphone = new SimplePhone("SimplePhone");
    Phone* dpa = new DecoratorPhoneA(iphone);
    dpa->ShowDecorate();

    Phone* phone = new SimplePhone("JarPhone");
    Phone* dpA = new DecoratorPhoneA(phone);
    Phone* dpb = new DecoratorPhoneB(dpA);
    dpb->ShowDecorate();

    Phone* cphone = new SimplePhone("ComplexPhone");
    Phone* d = new DecoratorPhoneA(cphone);
    Phone* dpB = new DecoratorPhoneB(d);
    Phone* dpC = new DecoratorPhoneC(dpB);
    dpC->ShowDecorate();

    delete dpa;
    delete iphone;

    delete dpA;
    delete dpb;
    delete phone;

    delete d;
    delete dpB;
    delete dpC;
    delete cphone;
}

四、结果

Java截图：

2、c++结果截图