设计模式——桥接模式

一、任务

用桥接模式实现在路上开车这个问题，其中，车可以是car或bus，路可以是水泥路或沥青路

二、类图

三、代码

1、Java

package tutorial9;

public interface AbstractRoad {

    public String roadRun();
}

package tutorial9;

public class AsphaltRoad implements AbstractRoad {

    @Override
    public String roadRun() {
        // TODO 自动生成的方法存根
        
        return "在沥青路上行驶";
    }

}

package tutorial9;

public class Cement implements AbstractRoad {

    @Override
    public String roadRun() {
        // TODO 自动生成的方法存根
        
        return "在水泥路上行驶";
    }

}

package tutorial9;

public abstract class Vehicle {
    protected AbstractRoad road;
    
    public Vehicle(AbstractRoad road) {
        this.road=road;
    }
    
    public abstract void run();

}

package tutorial9;

import java.util.Random;

public abstract class RefinedVehicle extends Vehicle {

    public RefinedVehicle(AbstractRoad road) {
        super(road);
        // TODO 自动生成的构造函数存根
    }
    
    public void chooseWay(String str1) {
        String str=str1+road.roadRun();
        System.out.println(str);
    }

}

package tutorial9;

public class Car extends RefinedVehicle{

    public Car(AbstractRoad road) {
        super(road);
        // TODO 自动生成的构造函数存根
    }

    @Override
    public void run() {
        // TODO 自动生成的方法存根
        System.out.println("小汽车");
    }

}

package tutorial9;

public class Bus extends RefinedVehicle {

    public Bus(AbstractRoad road) {
        super(road);
        // TODO 自动生成的构造函数存根
    }

    @Override
    public void run() {
        // TODO 自动生成的方法存根
        System.out.println("公交车");
    }

}

package tutorial9;

import java.util.Scanner;

public class Client {

    public static void main(String[] args) {
        System.out.println("*************************");
        System.out.println("请选择车辆：");
        System.out.println("1、小汽车");
        System.out.println("2、公交车");
        Scanner in=new Scanner(System.in);
        int choice=in.nextInt();

        System.out.println("*************************");
        System.out.println("请选择道路：");
        System.out.println("1、水泥路");
        System.out.println("2、沥青路");
        int choice2=in.nextInt();
        
        
        if(choice==1) {
            switch(choice2) {
            
                case 1:{
                    RefinedVehicle vehicle=new Car(new Cement());
                    vehicle.chooseWay("小汽车");
                }break;
                case 2:{
                    RefinedVehicle vehicle2=new Car(new AsphaltRoad());
                    vehicle2.chooseWay("小汽车");
                }break;
            
            }
        }else if(choice==2) {
            switch(choice2) {
            case 1:{
                RefinedVehicle vehicle=new Bus(new Cement());
                vehicle.chooseWay("公交车");
            }break;
            case 2:{
                RefinedVehicle vehicle2=new Bus(new AsphaltRoad());
                vehicle2.chooseWay("公交车");
            }break;
        
        }
        }
        
        
    } 
}

2、C++

#include<iostream>
using namespace std;

//抽象路
class AbstractRoad {

public:
    virtual string roadRun()=0;
};

class Vehicle {


public:
    
    Vehicle() {

    }
    virtual void run() {};

};


//沥青路
class AsphaltRoad :public AbstractRoad {

public:
    string roadRun() {

        return "在沥青路上行驶";
    }

};

//水泥路
class Cement :public AbstractRoad {

    
public:
    string roadRun() {

        return "在水泥路上行驶";
    }

};


class RefinedVehicle : public  Vehicle {

public:
    RefinedVehicle() {

    }
    

    

};
//
class Car :public RefinedVehicle {
private:
    AbstractRoad *road;
public:
    Car(AbstractRoad *road1) {
        road = road1;
    }
    void run() {
        // TODO 自动生成的方法存根
        cout<<"小汽车"+road->roadRun()<<endl;
    }

};

class Bus :public RefinedVehicle {
private:
    AbstractRoad* road;


public:
    Bus(AbstractRoad* road1) {
        road = road1;
    }
    void run() {

        cout << "公交车" + road->roadRun() << endl;
    }

};

int main() {

    cout<<"*************************"<<endl;
    cout << "请选择车辆："<<endl;
    cout << "1、小汽车"<<endl;
    cout << "2、公交车"<<endl;
    int choice = 0;
    cin >> choice;
    cout << "*************************" << endl;
    cout << "请选择道路：" << endl;
    cout << "1、水泥路"<<endl;
    cout << "2、沥青路" << endl;
    int choice2 =0;
    cin >> choice2;

    if (choice == 1) {
        switch (choice2) {

        case 1: {
            RefinedVehicle *vehicle = new Car(new Cement());
            vehicle->run();
        }break;
        case 2: {
            RefinedVehicle *vehicle2 = new Car(new AsphaltRoad());
            vehicle2->run();
        }break;

        }
    }
    else if (choice == 2) {
        switch (choice2) {
        case 1: {
            
            RefinedVehicle *vehicle = new Bus(new Cement());
            vehicle->run();
        }break;
        case 2: {
            RefinedVehicle *vehicle2 = new Bus(new AsphaltRoad());
            vehicle2->run();
        }break;

        }
    }
    return 0;
}

四、结果截图

1、Java截图

2、C++截图