It means placing Java side‑by‑side with other languages (C++, Python, C#, Go) or with its own past versions (Java 8 vs. Java 17/21). By seeing what Java does differently , you understand why it does what it does.
The book uses the metaphor of a fixing a messy codebase. It is structured into distinct levels of improvement. java by comparison pdf
No single official PDF exists, but you can build your own by gathering: It means placing Java side‑by‑side with other languages
Structuring tests with Given-When-Then and preparing for continuous integration or static code analysis . Why the Content is Considered "Good" Book Review: Java by Comparison - Inspired by Actual Events java by comparison pdf