Java 21# Game-Changing Chronicles

Mohmad Yakub
3 min readOct 14, 2023

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There are a lot of WOWS! Too, looks like a young tennis player with those sportive looks, a macho man of age 21.

Java Development Kit (JDK) 21’s features that’ll leave any Java developer awe-struck. Let’s unravel what it’s all about!

Simplifying the start of a Java program, JDK 21 allows for more straightforward entry points. No longer do we need public, static methods or an args array.

Starting Java programs has always been challenging! Java is easy now. There are a lot of WOWS! Too, looks like a young tennis player with those sportive looks, a macho man of age 21. I am like a Jdk 2.1 version. Yeah…., you got it right.

The Game Changers

Virtual threads, finalized in JDK 21, will change how web frameworks handle requests. Though they might sound magical, remember they aren’t a miracle cure for all performance issues. Still, proper adjustments could reveal their potential.

Have you ever wished for more flexible collections in Java? JDK 21 introduces SequencedCollection to enhance collections with methods like add…, get…, and remove…, providing more flexibility.

Completing the pattern-matching trifecta, JDK 21 introduces pattern matching for switch and record patterns, enabling developers to write more intuitive and concise code.

Exciting Previews & Incubations

JDK 21 upgrades the structured concurrency API to a preview, allowing for more structured handling of concurrent tasks and improving error handling and cancellation.

Interacting with foreign functions and memories gets safer and more efficient, reducing the risk of Java Native Interface vulnerabilities. The new Generational Garbage Collection optimizes memory management by maintaining separate generations for young and old objects, enhancing overall performance.

Like ZGC, Shenandoah is also taking the generational route, aiming to improve performance and maintainability. Embedding expressions in strings gets more secure and manageable thanks to introducing string templates in JDK 21.

JDK 21, packed with completed features and exciting previews, undoubtedly offers a promising journey ahead for Java developers. With enhanced performance, improved functionalities, and added security, Java continues to evolve and adapt, ensuring it remains the preferred choice for many.

Understand how — A New Era for Java, with enhanced functionalities, improved performance, and bolstered security, JDK 21 ensures Java’s continued to reign in the programming world.

https://openjdk.org/projects/jdk/21/

The theme of education and the classroom is universally relatable. Whether a reader is a student, educator, or professional, they have all interacted with the education system at some point, making the context familiar.

Gear up, save your interest and time, take journey of learning or progression on the backdrop of a theme that interests you, which can be more engaging than a dull, heartless technical manual. When I started, it wasn’t very interesting reading technical stuff. I kept some more patience, and it ended with a refreshening java 21 notes.

If you also feel the same way and like to save some time, you can refer to…… happy learning.

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Mohmad Yakub

Programmer - mentor & author. Teaching Physics & Learning - Story Telling