How do you access the inner class?

Answer 1

Will you specify language in Relevant Tags?

(Edit)
Debraj Singh please don't reply, just edit your original question above, and add Java in Relevant Tags section. I will remove this note as you updated the question. I suggest you remove your reply too.
Good luck! 👍

Answer 2

About inner classes:
https://www.tutorialspoint.com/java/java_innerclasses.htm

Answer 3

Java inner classes