What are packages ?

Answer 1

Similar to Python modules.
You can package your code with "package" keyword and import in another code with "import".
This way you can make a program with multiple code files...

Answer 2

Here are two IDEs

IDEA

Eclipse

https://www.sololearn.com/discuss/580291/?ref=app

Answer 3

Try using an IDE.

It will make sense after you make multiple classes.

For one Java code.

Answer 4

a group of similar classes