Why don't I have to import a class I just made to use it in my main class? (Java)

Question

I am currently learning Java using the Deitel\'s book Java How to Program 8th edition (early objects version).

I am on the chapter on creating classes and methods.

Answer 1

It's all about packages. You are trying to use a class from the default package which does not need explicit import of the java file, ie GradeBook inside GradeBookTest

Here is where you can start with learning about packages :

Java Package Tutorial

and :

Creating and Using Packages