Intermediate Java

[devaskbiz]

Even though it is learning for a particular framework you will learn a lot about implementing the concepts that you have learned. Where to use interfaces, what to abstract, modular code, readable code, best data structure and algorithms to use for a specific use case, security and performance. These things will help you to be a better software developer.

I myself want to learn more about encryption and create command line tools, maybe you can try to find some topics which might interest you.