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public class Bus implements Vehicle

{

@Override

public void drive()

{

System.out.print("大巴");

}

}

 

  

 

public class Car implements Vehicle

{

@Override

public void drive()

{

System.out.print("小轿车");

}

}

 

  

 

public class CementRoad extends Road

{

public CementRoad(Vehicle vehicle)

{

super(vehicle);

}

 

@Override

public void driveOnRoad()

{

super.vehicle.drive();

System.out.println("行驶在水泥路");

}

}

 

  

 

public class main {

public static void main(String[] args) {

Road road = new CementRoad(new Car());

road.driveOnRoad();

}

}

 

  

 

public abstract class Road

{

protected Vehicle vehicle;

 

public Road(Vehicle vehicle)

{

this.vehicle = vehicle;

}

 

public abstract void driveOnRoad();

}

 

  

 

public class UnpavedRoad extends Road

{

public UnpavedRoad(Vehicle vehicle)

{

super(vehicle);

}

 

@Override

public void driveOnRoad()

{

super.vehicle.drive();

System.out.println("行驶在石子路");

}

}

 

  

 

public interface Vehicle {

public void drive();

 

}