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Introduction If Java 8 gave us Streams and CompletableFuture, then Java 21 gives us something even more fundamental: A completely new way of thinking about concurrency. For over twenty years,…
Introduction Most enterprise developers spend their days writing: Spring Boot REST APIs Database queries Kafka consumers REST clients Business validations Authentication Authorization Very little of this work is CPU intensive.…
Introduction If you've spent your career developing Spring Boot microservices, you may never have written a single line of C or C++. Yet every day your Java applications depend on…
Introduction The Java Collections Framework has been one of Java's greatest strengths since Java 1.2. Enterprise developers use collections everywhere: REST APIs Spring Boot applications Database queries Cache implementations Message…
Introduction If you've followed this series from Java 8 to Java 17, you may have noticed something unusual. After Java 17, we suddenly started discussing Java 21. Naturally, many developers…
Introduction One of the oldest language constructs in Java is the switch statement. Almost every Java developer has used it to implement business rules such as: Order status transitions Payment…
Notice the progression of Java's evolution: Java 12 → Switch Expressions Java 14 → Records Java 16 → Pattern Matching for instanceof Java 17 → Sealed Classes Java 21 →…
Introduction Object-Oriented Programming is built around inheritance. For decades, Java allowed any class to extend another class unless it was declared final. This gave developers only two choices: Open for…
Introduction One of the most common operations in object-oriented programming is determining an object's type before performing a specific action. Consider a payment processing system. Payment │ ┌──────────────┼──────────────┐ ▼ ▼…
Introduction If Java developers were asked one question for the last twenty years, it would probably be: "Why do I have to write so much boilerplate code?" For years, enterprise…