How to know the classes which i need from any language programming

Answer 1

every programming language got an api (documentation)whenyou learn a programming language you will realize which classes you need and which not.look for api in google.for example google “java 8 api“

Answer 2

A smart peogrammer does give his classes descriptive names.
Define what you want to do and find the classes who can help accomplish that goal.

Answer 3

ok but what did you mean api

Answer 4

Are you looking for a description of the microsoft classes or a description of the video-software you were working on.

API stands for application programming interface. Every programmer should write this documentation if they want other programmers to be able to use their software