What is the main libraries in java and their use ?

Answer 1

You can find it here

http://docs.oracle.com/javase/7/docs/api/index.html&hl=en-NG

But here is a list of things to know:

java.lang is for all the basic classes that are actually imported automatically (implicitly) because it is all the basic ones (String, Integer, Double, etc)

java.util contains all your data structures you learned in school and more. Read the documentation, and the more you know and practice, the better

java.io for file reading. Look into java.util.Scanner for simple file reading, but for any more complicated, low level file reading info, use java.io, its built for efficiency, while Scanner is for simplicity

java.math if you ever need to use arbitrary precision values (built-in in python, not in java)

java.net for sockets, connections, etc

javax.swing for GUI, which is an extension of the older java.awt

Hope that helps.

Answer 2

Thanks it sure helps