자바 상속 다형성 super 동시에 써보자

class A{

 public int num =2;

}

class B extends A{

 public int num =5;

 public void shownum(){

  System.out.println(num);

  System.out.println(super.num);

 }

}

class C extends B{

 public int num =7;

 public void showallnum(){

  super.shownum();

  System.out.println(super.num);

 }

}

class geeshowall {

 public static void main(String[] args) {

  A c = new C();

  //C c1 = (C)c;

  //c1.showallnum();

  ((C)c).showallnum();

 }

}