Why instantiation of static nested class object is allowed?

Question

I have started learning Java language for Android Application developement.

As per my understanding based on static class, we cannot instantiate object of static cla

Answer 1

As per my understanding based on static class, we cannot instantiate object of static class.

Your understanding of the meaning of "static class" is incorrect. Basically a "static class" in Java is a nested class which doesn't have an implicit reference to an instance of the containing class. See section 8.5.1 of the JLS for more information, in particular:

The static keyword may modify the declaration of a member type C within the body of a non-inner class or interface T. Its effect is to declare that C is not an inner class. Just as a static method of T has no current instance of T in its body, C also has no current instance of T, nor does it have any lexically enclosing instances.

Perhaps you were thinking of static classes in C#, which are completely different?