Sealed Interfaces + Exhaustive Switch: The Pattern the Senior Java Interview Expects

Six progressively harder questions — from exhaustiveness guarantees and non-sealed subtypes to generic bounds and cross-package visibility. Everything a senior…

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Kotlin 2.x vs Java 21+The Language Choice for New JVM Projects

The K2 compiler shipped. Multiplatform went stable. Java landed records, pattern matching, and virtual threads. The gap genuinely narrowed —…

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Modern Java Language Features: Records, Sealed Classes, Pattern Matching

Java’s evolution over the past few years represents the most significant transformation in how we write code since the introduction…

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Java 21 Key Encapsulation Mechanism (KEM) API

Secure communication relies on exchanging cryptographic keys safely over untrusted networks. Until Java 21, implementing this in Java required combining…

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CompletableFuture vs Virtual Threads: When to Use Each

Java 21 introduced virtual threads as a production-ready feature, fundamentally changing how we approach asynchronous programming. For years, CompletableFuture has…

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Java Record Patterns: Simplifying Data Navigation with Nested Deconstruction

Java 21 brought a transformative feature to the language: Record Patterns (JEP 440). After being previewed in Java 19 and…

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Sequenced Collections API: Standardizing Ordered Access

For decades, Java’s Collections Framework had a glaring inconsistency. Want the first element of a List? Call list.get(0). First element…

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GraalVM Native Image for Spring Boot / Quarkus: Step-by-step production example

If you’ve heard that Java can start in milliseconds and sip memory like an espresso shot—yep, that’s GraalVM Native Image.…

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Secure Coding with Java 21: Sealed Classes, Pattern Matching & Crypto Enhancements

Java 21 is more than just the next LTS release—it’s a thoughtful step toward writing cleaner, safer, and more expressive…

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