JavaPerf Tips’ Post

🔹 What is an Interface in Java? An interface is a blueprint of a class that contains only abstract methods (method without body). It tells "what to do" but not "how to do". - Example: A remote control – it has buttons, but how the TV works internally is hidden. - Key Points: ✔ All methods are abstract by default (before Java 8) ✔ Supports multiple inheritance ✔ Used to achieve 100% abstraction + Why use interface? - Improves flexibility - Supports multiple inheritance - Helps in loose coupling #fortunecloudtechnology #Java #MultipleInheritance #Interface #OOP

Java Text Blocks, a feature introduced in Java 15, help resolve Sonar issues. However, most developers are not using this feature. It should be adopted and used regularly. https://lnkd.in/gdg2RfeJ

Key Features in the Last 4 LTS Releases of Java This infographic highlights major features across Java 8, 11, 17, 21, and 22: - Java 8: Lambda, Stream API, Date/Time API, Optional class - Java 11: HTTP Client, var in lambdas, String improvements - Java 17: Sealed classes, Records, Pattern Matching, Enhanced Switch - Java 21: Virtual Threads, Sequenced Collections, Pattern Matching for switch - Java 22: Unnamed Variables, Streams for Primitives, Statements before super() This serves as a quick reference for Java developers to track language evolution across LTS versions. #Java #JavaDeveloper #Java8 #Java11 #Java17 #Java21 #Java22 #LTS #Programming #SoftwareDevelopment #BackendDevelopment #SpringBoot #CodeNewbie #100DaysOfCode #TechEducation #LearnJava #JavaProgramming #OpenJDK #VirtualThreads #LambdaExpressions #LinkedInTech

Java 17 vs Java 21 — what really changed? Java 17 gave us a solid and stable LTS foundation, with features like records, sealed classes, and improved pattern matching. It became the go-to choice for production systems. Java 21 takes things further with a strong focus on scalability and modern development. The highlight? Virtual Threads, enabling massive concurrency with simpler code. We also get improvements in pattern matching, new APIs (like Sequenced Collections), and better performance with enhancements in the JVM and garbage collectors. In short: Java 17 is stability. Java 21 is evolution. If you're building modern, high-scale systems, Java 21 is a big step forward

Virtual Threads are probably the most significant change in JVM since the traditional concurrency model. In I/O-bound scenarios, they allow you to scale while maintaining simple and predictable code, something that historically required reactive or lots of engineering around pools. Still, the actual impact depends on how "thread-friendly" the remaining stack is.

writing a multithreaded code in Java and not sure which interface to use? take this: Part 1: ✅ use Thread when you need to manually create and control a lightweight task ✅ use Runnable for fire-and-forget tasks ✅ use Callable when you need a result or exception handling ✅ use Executor to abstract task execution from thread management ✅ use ExecutorService when you need lifecycle control (shutdown, submit tasks, manage pools) ✅ use Executors to quickly create common thread pool implementations (fixed, cached, single-threaded)

One thing I like about Java is that the biggest progress is often not dramatic enough for social media. There is no single “magic” feature between Java 21 and 25 that changes everything overnight. What you get instead is something more valuable: a better platform. Between Java 21 and 25, Java added: ✅ Scoped Values, ✅ Structured Concurrency, ✅ Foreign Function & Memory API, ✅ Stream Gatherers, ✅ Class-File API, ✅ Compact Object Headers, ✅ Generational Shenandoah, ✅ more startup and profiling work, ✅ better JFR, ✅ and... cleaner syntax with unnamed variables and patterns, module import declarations, and more flexible constructor bodies. That is why I liked Frank Delporte’s video on the move from Java 21 to 25. It looks at Java the way real teams should look at it: not as isolated release notes, but as accumulated engineering progress between LTS versions. Too many people ignore the non-LTS releases and then act surprised when the next LTS contains a lot of change. Worth watching if you want a practical summary without drowning in JEP numbers. ➡️ https://lnkd.in/dnqmDUnj Are you on Java 25 yet?

Thanks, Daniel Witkowski, for sharing this episode of the Friends of OpenJDK (Foojay.io) podcast about the changes between Java 21 and 25. And to Jakob Jenkov, Jonathan Vila López, Ryan Svihla, Mary Grygleski, 👓 Anton Arhipov, Ronald Dehuysser, and Jonathan Ellis, who took the time to share their point of view!

Key Features in the Last 4 LTS Releases of Java This infographic covers major features across Java 8, 11, 17, 21, and 22: Java 8 — Lambda, Stream API, Date/Time API, Optional class Java 11 — HTTP Client, var in lambdas, String improvements Java 17 — Sealed classes, Records, Pattern Matching, Enhanced Switch Java 21 — Virtual Threads, Sequenced Collections, Pattern Matching for switch Java 22 — Unnamed Variables, Streams for Primitives, Statements before super() A quick reference for Java developers to track language evolution across LTS versions. #Java #JavaDeveloper #Java8 #Java11 #Java17 #Java21 #Java22 #LTS #Programming #SoftwareDevelopment #BackendDevelopment #SpringBoot #CodeNewbie #100DaysOfCode #TechEducation #LearnJava #JavaProgramming #OpenJDK #VirtualThreads #LambdaExpressions #LinkedInTech

A neat Java idea from JDK 24 preview: JEP 487, Scoped Values. Scoped values aim to make shared immutable context easier to reason about than ThreadLocal, especially in modern concurrent code. Tiny example 👇