设计模式—策略模式

[实验任务一]：旅行方式的选择

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。

 

 java实现

package strategy;

public class Person {
    private TourStrategy ts;

    public void setTs(TourStrategy ts) {
        this.ts = ts;
    }

    public void travel(){
        ts.travel();
    }
}

package strategy;

public interface TourStrategy {
    public void travel();
}

package strategy;

public class AirStrategy implements TourStrategy{
    @Override
    public void travel() {
        System.out.println("乘坐飞机旅游");
    }
}

package strategy;

public class TrainStrategy implements TourStrategy{
    @Override
    public void travel() {
        System.out.println("乘坐火车旅游");
    }
}

package strategy;

public class BikeStrategy implements TourStrategy{
    @Override
    public void travel() {
        System.out.println("骑自行车旅游");
    }
}

package strategy;

public class Client {
    public static void main(String[] args) {
        Person p = new Person();
        TourStrategy air = new AirStrategy();
        p.setTs(air);
        p.travel();
        System.out.println("-------------------------");
        TourStrategy train = new TrainStrategy();
        p.setTs(train);
        p.travel();
        System.out.println("-------------------------");
        TourStrategy bike = new BikeStrategy();
        p.setTs(bike);
        p.travel();
    }
}

 

c++实现

#include<iostream>

using namespace std;

class TourStrategy {
public:
    virtual void travel() {};
};

class Person {
private:
    TourStrategy *ts;
public:
    void setTs(TourStrategy *ts) {
        this->ts = ts;
    }

    void travel() {
        ts->travel();
    }
};

class AirStrategy : public TourStrategy {
public:
    void travel() {
        cout << "乘坐飞机旅行" << endl;
    }
};

class TrainStrategy : public TourStrategy {
public:
    void travel() {
        cout << "乘坐火车旅行" << endl;
    }
};

class BikeStrategy : public TourStrategy {
public:
    void travel() {
        cout << "骑自行车旅行" << endl;
    }
};

int main() {
    Person *p = new Person();
    TourStrategy *air = new AirStrategy();
    p->setTs(air);
    p->travel();
    cout << "---------------------" << endl;
    TourStrategy *train = new TrainStrategy();
    p->setTs(train);
    p->travel();
    cout << "---------------------" << endl;
    TourStrategy *bike = new BikeStrategy();
    p->setTs(bike);
    p->travel();
    return 0;
}