Java Records and Sealed Classes
Java 17 introduced records and sealed classes as standard features. Records eliminate boilerplate for simple data classes. Sealed classes restrict […]
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Java Optional and Null Safety
NullPointerException is Java’s most common runtime error. Tony Hoare, who invented null references, called it his “billion-dollar mistake.” Java 8
Java Dependency Injection Explained
Dependency Injection (DI) is a design pattern where objects receive their dependencies from external sources rather than creating them internally.
Java Logging Best Practices
Logging is how your application tells you what happened when you weren’t watching. Good logs help you debug problems, track
Java Unit Testing with JUnit
Unit tests verify that individual pieces of your code work correctly. They catch bugs early, make refactoring safer, and serve
Java Design Patterns
Design patterns are reusable solutions to common programming problems. They’re not code you copy and paste, but templates for structuring
Build a REST API with Spring Boot
You’ve learned Spring Boot basics. Now it’s time to build something real. This project creates a complete REST API for