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Taking Java to the next level: what resources can I use to learn mid-advanced Java?

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My recommendation would be: first, define your higher level goal! Do you want to "take your java to the next level" to push your career and get more money? Or you want to do that because you have fun with java and want to become a "walking java wiki", knowing every tiny internal java magic? One can say: "But it's the same! Being java wiki will bring you more money!" - yes, to some extent. But the other statement works differently: you still can get more money and don't become a wiki. So, depending on your inner choice I could say: if you want to become a "wiki" - read books! There're a lot of java classics from famous authors out there. You can easily google some awesome book on any topic you want to dive in if you want more money faster - build your own projects from scratch, using modern/popular frameworks/tools/libraries! You're proficient enough to answer a question: "What tech stack is required on the market today?" and proficient enough (hopefully) to design a new microservice (or monolith) from scratch to try and demonstrate your skills with this selected tech stack When you build you own projects from scratch - you can not avoid learning theory. But every your "theoretical question" will be backed up with your coding problem. So, the effectiveness of learning and information digestion will be much higher, than from just reading a book. Slight warning, if you go "projects" way - don't rely on AI too much. If you end up with ChatGPT writing 70% of your code - this type of "project from scratch" is a fake learning, to some extent. You'll get much less practical experience and real usable knowledge if AI do the work. AI is great in explaining some theory, giving you code example to demonstrate some idea or topic, helping you to find and understand a bug in your code... So, it should be your assistant, not your programming slave. /continue in the next post.../ Answer from ahonsu on reddit.com

reddit.com › r/learnjava › taking java to the next level: what resources can i use to learn mid-advanced java?

r/learnjava on Reddit: Taking Java to the next level: what resources can I use to learn mid-advanced Java?

January 22, 2025 -

Greetings!

I've been working with Java almost 2 years now and I've reached the point in which I feel comfortable using the language on a daily basis to solve production problems (I work as backend developer with a SpringBoot - Reactor stack), but I'm aware that there's a bunch of stuff about the language that I don't know about.

In other words, I'm aware that I'm ignorant, but I don't know what I'm ignorant about. Does that make sense? I don't want to comfortably fall into the slumber of competent incompetence. In other words, I don't want to get stuck as an expert beginner.

Based on my work experience, I've identified three "clear" areas where I've noticed my knowledge is limited and I know that I can do better and an additional, blurrier area that makes me uncomfortable:

Generics.
Exception handling and error management.
Data structures beyond the basic ArrayList and HashMap. That is: get to know other implementations of those interfaces, other types of collections, etc.
Working with Java without "hand-holding" tools or frameworks: I usually work pretty comfortable because the microservices I work on are already created and their build steps established (we use Gradle). But when I consider the possibility of booting a new microservice on my own (from choosing dependencies to establishing build steps and the like), I get a little anxious, I must admit.

I'm already working on those items and have, more or less, an action plan to improve my knowledge on them. Furthermore, I'm complementing my learning with the book "Effective Java" by Joshua Bloch. However, that's more of a "reference" book and it's not really read from cover to cover.

So I guess my question is, what is next? What more should I know at this stage? What Java subjects, characteristics and features does a person with my experience level usually take for granted and is ignorant about? What resources could I use to take my Java to the next level?

Please be aware that I'm trying to stay focused on Java. I'm aware that I also need to learn more about additional frameworks and external libraries, but in this particular scenario I want to become proficient in Java alone and get to understand the language on its own really well.

Thanks a lot!

Top answer

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My recommendation would be: first, define your higher level goal! Do you want to "take your java to the next level" to push your career and get more money? Or you want to do that because you have fun with java and want to become a "walking java wiki", knowing every tiny internal java magic? One can say: "But it's the same! Being java wiki will bring you more money!" - yes, to some extent. But the other statement works differently: you still can get more money and don't become a wiki. So, depending on your inner choice I could say: if you want to become a "wiki" - read books! There're a lot of java classics from famous authors out there. You can easily google some awesome book on any topic you want to dive in if you want more money faster - build your own projects from scratch, using modern/popular frameworks/tools/libraries! You're proficient enough to answer a question: "What tech stack is required on the market today?" and proficient enough (hopefully) to design a new microservice (or monolith) from scratch to try and demonstrate your skills with this selected tech stack When you build you own projects from scratch - you can not avoid learning theory. But every your "theoretical question" will be backed up with your coding problem. So, the effectiveness of learning and information digestion will be much higher, than from just reading a book. Slight warning, if you go "projects" way - don't rely on AI too much. If you end up with ChatGPT writing 70% of your code - this type of "project from scratch" is a fake learning, to some extent. You'll get much less practical experience and real usable knowledge if AI do the work. AI is great in explaining some theory, giving you code example to demonstrate some idea or topic, helping you to find and understand a bug in your code... So, it should be your assistant, not your programming slave. /continue in the next post.../

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I would say watch concept and coding in yt very good guy and he has a Playlist of spring boot, hld and lld as well. At the higher exp level you will be judged more on how efficient and optimized your code is and how you handle teams. So learn a bit of soft skills and system design and architecture.

Medium

medium.com › javarevisited › i-tried-50-java-courses-here-are-my-top-6-recommendations-46361e33f7ee

I Tried 50 Java Courses: Here Are My Top 6 Recommendations | by javinpaul | Javarevisited | Medium

October 8, 2025 - I learned optimization techniques that improved our application’s throughput by 40%. ... The caveat: Only worth it if you’re already senior and need advanced insights. Here is the link to join this course — — Java Specialists Superpack 2025

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YouTube channels to learn advanced Java programming?

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October 17, 2024

Where to learn Advanced Java?

A quick skim over the contents of the latest edition of the book Java The Complete Reference by Hebert Schildt is a good place to see what it is that you don't yet know.

It is also an excellent reference and has good examples. If you need more practice and examples you can always visit the official Java tutorials for jdk 8 website.

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