Java/C++实现策略模式---旅游出行方式

旅游的出行方式有乘坐飞机旅行、乘火车旅行和自行车游，不同的旅游方式有不同的实现过程，客户可以根据自己的需要选择一种合适的旅行方式。

类图：

 

 Java代码：

public class Person {
    private TravelStrategy strategy;
    public void setStrategy(TravelStrategy strategy) {
        this.strategy=strategy;
    }
    public void travel() {
        strategy.travel();
    }
}


public interface TravelStrategy {
    public void travel();
}


public class TrainStrategy implements TravelStrategy{

    @Override
    public void travel() {
        // TODO Auto-generated method stub
        System.out.println("乘火车旅游");
    }

}


public class BicycleStrategy implements TravelStrategy{

    @Override
    public void travel() {
        // TODO Auto-generated method stub
        System.out.println("自行车游");
    }

}

public class AirplaneStrategy implements TravelStrategy{

    @Override
    public void travel() {
        // TODO Auto-generated method stub
        System.out.println("乘坐飞机旅游");
    }

}


public class Client {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("我要去旅游，选哪种出行方式呢？");
        Person pr=new Person();
        TravelStrategy strategy=new TrainStrategy();
        pr.setStrategy(strategy);
        pr.travel();
        System.out.println("------------------------------");
        System.out.println("我要去旅游，选哪种出行方式呢？");
        TravelStrategy strategy2=new BicycleStrategy();
        pr.setStrategy(strategy2);
        pr.travel();
        System.out.println("------------------------------");
        System.out.println("我要去旅游，选哪种出行方式呢？");
        TravelStrategy strategy3=new AirplaneStrategy();
        pr.setStrategy(strategy3);
        pr.travel();
    }

}

C++代码：

#include<iostream>
using namespace std;
class TravelStrategy {
public:
    virtual void travel()=0;
};
class Person {
private:
    TravelStrategy *strategy;
public:
    void setStrategy(TravelStrategy *strategy) {
        this->strategy=strategy;
    }
    void travel() {
        this->strategy->travel();
    }
};
class TrainStrategy : public TravelStrategy{
public:
    void travel() {
        cout<<"乘火车旅游"<<endl;
    }
};
class BicycleStrategy : public TravelStrategy{
public:
    void travel() {
        cout<<"自行车游"<<endl;
    }
};
class AirplaneStrategy: public TravelStrategy{
public:
    void travel() {
        cout<<"乘坐飞机旅游"<<endl;
    }
};
int main(){
        cout<<"我要去旅游，选哪种出行方式呢？"<<endl;
        Person *pr=new Person();
        TravelStrategy *strategy=new TrainStrategy();
        pr->setStrategy(strategy);
        pr->travel();
        cout<<"------------------------------"<<endl;
        cout<<"我要去旅游，选哪种出行方式呢？"<<endl;
        TravelStrategy *strategy2=new BicycleStrategy();
        pr->setStrategy(strategy2);
        pr->travel();
        cout<<"------------------------------"<<endl;
        cout<<"我要去旅游，选哪种出行方式呢？"<<endl;
        TravelStrategy *strategy3=new AirplaneStrategy();
        pr->setStrategy(strategy3);
        pr->travel();
}

运行结果：