class a public class Type Sting s=class: A", static public void main (string arg Bbl, b2=new BO; A ala2 class b extends a al=(A)b2 2=b2 Strings=class: B System. out. println(als); System. out. printIn(a2s) bl=Bal System. out. printIn(bls);class A { String s = "class : A"; } class B extends A { String s = "class : B"; } public class Type { static public void main(String arg[]) { B b1,b2 = new B( ); A a1,a2; a1 = (A)b2; a2 = b2; System.out.println(a1.s); System.out.println(a2.s); b1 = (B)a1; System.out.println(b1.s); } }