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Michele Gallotti
Michele Gallotti

Posted on • Originally published at eldritch.codes

The Building Blocks of Code: Lexical Structure and Grammars in Java SE 25

Most Java tutorials teach you what to write. This series is different — it explores the language from the perspective of how the JVM actually processes your code, guided by the original documentation that most developers never open.

In this first chapter, you'll explore:

  • How the JLS formally defines Java through context-free grammars
  • The difference between lexical grammar and syntactic grammar
  • How raw text is transformed into tokens before compilation even begins
  • Why understanding lexical analysis changes the way you read (and debug) code

This isn't another tutorial sequence — it's a deep dive into the arcane foundations of Java SE 25, built directly on the Java Language Specification.

Read the full article: https://eldritch.codes/en/tome/tome-01-lexical-foundations/chapter-01


Part of the "Eldritch Codes" series — a comprehensive guide to Java SE 25, explored through the lens of the JVM and the original specs.

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