No. You must create a subclass of the abstract class in order to be able to instantiate it.

int* pint; // instantiate a pointer to an int.

float* pflt; // instantiate a pointer to a float.

The term 'instantiate' can be used in many different ways. The word 'instantiate' is a term meaning to provide an example. One way an individual might use the term is 'The mom instantiated how to tie her shoe.'

According to a beginner's book on Java, an interface can't have constructors. Also, the interface itself can't contain the method implementation.

No. An interface can only be implemented.