桥接模式--Java实现

画类图

具体代码实现

//Road.java
package org.example.design007;

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

    protected Vehicle vehicle;

    public abstract void drive();
}

//LiQing.java
package org.example.design007;

public class LiQing extends Road{
    @Override
    public void drive() {
        vehicle.run();
        System.out.println("行驶在沥青路上");
    }
}

//ShuiNi.java
package org.example.design007;

public class ShuiNi extends Road{
    @Override
    public void drive() {
        vehicle.run();
        System.out.println("行驶在水泥路上");
    }
}

//Vehicle.java
package org.example.design007;

public interface Vehicle {
    public void run();
}

//Bus.java
package org.example.design007;

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

//Car.java
package org.example.design007;

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

//Main.java
package org.example.design007;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        Vehicle vehicle=null;
        Road road=null;

        System.out.println("请选择：1、Bus/沥青路；2、Bus/水泥路；3、Car/沥青路；4、Car/水泥路");

        int m=sc.nextInt();

        if(m==1){
            vehicle=(Vehicle) new Bus();
            road=(Road) new LiQing();
        }else if(m==2){
            vehicle=(Vehicle) new Bus();
            road=(Road) new ShuiNi();
        }else if(m==3){
            vehicle=(Vehicle) new Car();
            road=(Road) new LiQing();
        }else if(m==4){
            vehicle=(Vehicle) new Car();
            road=(Road) new ShuiNi();
        }else{
            System.out.println("不存在这样的行为");
        }

        road.setVehicle(vehicle);
        road.drive();
    }
}