Try this Qs.
class Alpha{}
class Beta extends Alpha{}
class Gamma extends Alpha{}
public class AlphaTest
{
public static void main(
String args[])
{
Alpha alpha = new Beta();
if (alpha instanceof Beta) System.out.println("Beta");
if (alpha instanceof Alpha) System.out.println("Alpha");
if (alpha instanceof Gamma) System.out.println("Gamma");
else
System.out.println("Not Gamma!! Why ?");
}
}