//I am learning java

Answer 1

Good work!
The most pragmatic advice I can give is to build a project in Java, and then another, and then another. Eventually you will get to use a wide variety of packages and get a good grounding in the language and the SDKs.
@Sololearn

Answer 2

https://www.sololearn.com/Discuss/588107/?ref=app

Answer 3

.👍
https://code.sololearn.com/WwdQescTMkvA/?ref=app