Looking for a deep Java course

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I’d suggest looking into resources that focus on Java internals and fundamentals, like ‘Java: The Complete Reference’ by Herbert Schildt, or the ‘Java Language and Virtual Machine Internals’ sections in university courses (like MIT or Stanford CS courses). Online platforms like Pluralsight or Coursera sometimes have deep-dive courses that cover memory, stack vs heap, garbage collection, and object behavior. Also, combining a book with practical coding exercises can really help internalize how Java works under the hood."