class A { int a = 100; } class B extends A { float b = 20.25f; } class C extends A { char c = 'c'; } class D extends A { double d = 2000.25d; } class Demo2 { public static void main(String[] args) { A a1 = new A(); System.out.println(a1.a); B b1 = new B(); System.out.println(b1.a); System.out.println(b1.b); C c1 = new C(); System.out.println(c1.a); //System.out.println(c1.b); System.out.println(c1.c); D d1 = new D(); System.out.println(d1.a); //System.out.println(d1.b); //System.out.println(d1.c); System.out.println(d1.d); } }