Parameterized class declaration in UVM

How can we know any declared class is parameterized or not? When is it used? Please explain with example.

In reply to Amrish Kaklottar:

The intent behind your question is not clear. You can “know” if it parameterized by looking at the source code.

class A #(int I);
   ...
endclass 

class B;
   ...
endclass

Class A is parametrized, class B is not.