class A { int a = 10; } class B extends A { boolean c = true; } class C extends A { char g = 'K'; } class D extends A { float b = 20.525f; public static void main(String[] args) { System.out.println("Hello World!"); A s1 = new A(); System.out.println(s1.a); B s2 = new B(); System.out.println(s2.c); System.out.println(s2.a); C s3 = new C(); System.out.println(s3.g); //System.out.println(s3.c); System.out.println(s3.a); D s4 = new D(); System.out.println(s4.a); //System.out.println(s4.c); //System.out.println(s4.g); System.out.println(s4.b); } }