[code=php]
//Animal.java  ------------------------------------------------- (추상 클래스)
abstract class Animal {
abstract void crying();

}
[/code]

//Cat.java  -------------------------------------------------
[code=php]
public class Cat extends Animal {

@Override
void crying() {
// TODO Auto-generated method stub
System.out.println("냐~ 옹~");

}

}
[/code]

//Dog.java  -------------------------------------------------
[code=php]
public class Dog extends Animal {

@Override
void crying() {
// TODO Auto-generated method stub
System.out.println("멍~ 멍~");

}

}
[/code]

//Main.java  -------------------------------------------------
[code=php]
public class MAin {

public static void main(String[] args) {
// TODO Auto-generated method stub
// 추상을 상속받은 클래스의 new 클래스를 생성하여 불러온다.
Dog dog = new Dog();
Cat cat = new Cat();
dog.crying();
cat.crying();
}

}
[/code]