两个维度的桥接模式

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。

类图

 代码

Vehicle.java
package qiaojie;

public interface Vehicle {
    
    public void run();
    
}

Road.java
package qiaojie;

public abstract class Road {
    
    protected Vehicle vehicle;
    public void setVehicle(Vehicle ve) {
        this.vehicle=ve;
    }
    public abstract void drive();
    
}

Shuini.java
package qiaojie;

public class Shuini extends Road{
    
    public void drive() {
        vehicle.run();
        System.out.println("行驶在水泥路");
    }
    
}
Liqing.java
package qiaojie;

public class Liqing extends Road{
    
    public void drive() {
        vehicle.run();
        System.out.println("行驶在沥青路");
    }
    
}
Bus.java
package qiaojie;

public class Bus implements Vehicle{
    
    @Override
    public void run() {
        System.out.print("Bus");    
    }
    
}

Car.java
package qiaojie;

public class Car implements Vehicle{
    
    @Override
    public void run() {
        System.out.print("Car");    
    }
    
}

Main.java
package qiaojie;

import java.util.Scanner;

public class Main {
    
    public static void main(String[] args) {
        Vehicle vehicle = null;
        Road road = null;
        System.out.println("请选择：1、Car/水泥路  2、Car/沥青路  3、Bus/水泥路  4、Bus/沥青路");
        Scanner input=new Scanner(System.in);
        int i=input.nextInt();
        if(i==1) {
            vehicle=(Vehicle)new Car();
            road=(Road)new Shuini();
        }else if(i==2) {
            vehicle=(Vehicle)new Car();
            road=(Road)new Liqing();
        }else if(i==3){
            vehicle=(Vehicle)new Bus();
            road=(Road)new Shuini();
        }else if(i==4) {
            vehicle=(Vehicle)new Bus();
            road=(Road)new Liqing();
        }else {
            System.out.println("输入无效！");
        }
        road.setVehicle(vehicle);
        road.drive();
    }
    
}

#include<iostream>
using namespace std;
class transport
{
public :
    transport(){}
    virtual ~transport(){}
    virtual void bedrive()=0;
};

class bus :public transport
{
public:
    bus(){}
    virtual~bus(){}
    void bedrive(){cout<<"bus"<<endl;}
};

class car :public transport
{
public:
    car(){}
    virtual~car(){}
    void bedrive(){cout<<"car"<<endl;}
};




class road
{
public:
    road():_instance(NULL){}
    virtual~road(){}
    void settransport(transport *instance)
    {
        _instance=instance;
    }
    virtual void drive()=0;
protected:
        transport *_instance;

};

class shuini :public road
{

public:
    shuini(){}
    virtual~shuini(){}
    void drive(){cout<<"行驶在水泥路";_instance->bedrive();}
};

class liqing :public road
{
    liqing(){}
    virtual~liqing(){}
    void drive(){cout<<"行驶在沥青路";_instance->bedrive();}
};

int main()
{
    road *ro=new shuini;
    transport *tr=new bus;
    ro->settransport(tr);
    ro->drive();
    delete ro;
    delete tr;

    system("pause");
    return 0;
}