23.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。

代码

Java

package test23;

public class AirplaneStrategy implements TravelStrategy{
    @Override
    public void travel() {
        System.out.println("做飞机出行");
    }
}

package test23;

public class BicycleStrategy implements TravelStrategy{
    @Override
    public void travel() {
        System.out.println("自行车出游");
    }
}

package test23;

public class Client {

    public static void main(String[] args) {
        Person person = new Person();
        AirplaneStrategy airplaneStrategy = new AirplaneStrategy();
        person.setStrategy(airplaneStrategy);

        person.travel();
    }

}

package test23;

public class Person {

    private TravelStrategy strategy;

    public void setStrategy(TravelStrategy strategy) {
        this.strategy = strategy;
    }

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

package test23;

public class TrainStrategy implements TravelStrategy{
    @Override
    public void travel() {
        System.out.println("火车出游");
    }
}

package test23;

public interface TravelStrategy {

    public void travel();

}

C++

#include <iostream>
using namespace std;

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

class AirplaneStrategy: public TravelStrategy{
public:
    void travel(){
        cout<<"坐飞机出行"<<endl;
    }
};

class BicycleStrategy: public TravelStrategy{
public:
    void travel(){
        cout<<"自行车出行"<<endl;
    }
};

class TrainStrategy: public TravelStrategy{
public:
    void travel(){
        cout<<"火车出门"<<endl;
    }
};

class Person{
private:
    TravelStrategy *strategy;
public:
    void setStrategy(TravelStrategy *strategy){
        this->strategy = strategy;
    }
    void travel(){
        strategy->travel();
    }
};

int main(){
    AirplaneStrategy strategy;
    Person person;
    person.setStrategy(&strategy);
    person.travel();
}