📄️ Java Quick Reference
Copy-paste reference for everyday Java 21 — strings, collections, sorting, streams, dates, files, regex, concurrency, JUnit, and build commands.
📄️ Java Coding Best Practices
Habits that make Java code easier to read, test, change, and run safely — naming, classes, nulls, exceptions, collections, logging, concurrency, security, testing, and a pre-commit checklist.