JAva設計モデル——分かりやすい7つの原則

class Laowang{
    public  void  goToBeijing(Car car){
        System.out.println("    "+car.name+"   ");
    }
}

//         
class Car{
	public String name="  ";
} 

//main  
public static void main(String[] args) {
    Laowang laowang = new Laowang();
    Car car = new Car();
    laowang.goToBeijing(car);
}

       ：
	         

class Laowang{
    public  void  goToBeijing(Vehicle vehicle){
        System.out.println("    "+vehicle.name+"   ");
    }
}

//     
class Vehicle{
   public String name;
}
//   
class Car extends Vehicle{
    public Car(){
        super.name="  ";
    }
}
//   
class AirPort extends Vehicle{
    public AirPort(){
        super.name="  ";
    }
}
//main  
public static void main(String[] args) {
    Laowang laowang = new Laowang();
    Car car = new Car();
    AirPort airPort=new AirPort();
    //     
    laowang.goToBeijing(car);
    //     
    laowang.goToBeijing(airPort);
}
      :
	         
	         

class Laowang{
	public  void  goToBeijing(Vehicle vehicle){
        System.out.println("    "+vehicle.name+"   ");
        Car car = new Car;
    }
}