How do you use packages in java?

Question

Hi! I use Sublime Text and I wanted to know how you insert java packages, do you just write package and the file extension?

Answer 1

if you have class LibClass and want add it to package Lib and then call it from Main code

- LibClass must be public
- LibClass must be in file LibClass.java
- first statement in LibClass.java must be:
package Lib;
- in directory where you run Main code create subdirectory Lib
- move LibClass.java into subdirectory Lib
- in your Main code must be at beginning of file
import Lib.LibClass;
//or
import Lib.*;

Answer 2

yes, folder.

Answer 3

Thank you so much. One question: what do you mean by subdirectory? Is it a folder?