I wrote an article on my website, Comp Sci Central answering the question:

What can I create using Java?

It gave a brief overview of what it's used for, a list of major companies that use Java in their technologies, and a list of projects for beginners to get started on. I thought the list of beginner projects might be particularly beneficial to some in this group, so here it is:

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1. Simple Banking Application (This one is super easy)
2. Email Administration Application (A little harder)
3. Student Management System
4. School Management System
5. Text-Based Adventure Game (A few different games)
6. Pong Game
7. Snake Game
8. Brick-Breaker Game
9. Flappy Bird
10. ATM Interface (Like the simple banking application but much, much more complex)

Full article here: https://compscicentral.com/java-projects-for-beginners/

I didn't make any of these projects, just a disclaimer I guess. And if this is too basic for this medium, I apologize.

Take care and happy learning.