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Before you delve deeper into some of the constructs and code functionality, it is important to get some basics right and know a little about the fundamental Java code structure.
Fabulous articles, online learning and e-books
Learn (theory) with examples on Java Basics and code structure: https://chortle.ccsu.edu/Java5/index.html#10
Additional articles and theory links: Runestone AP Computer Science (Java) & How to think like a computer scientist (Java online book)
Video series:
Java Learn & Code: #1 Video on Input & Output in Java.