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What are the new developer features in Java 21?
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What are the release notes for JDK 21 & Java SE 21?
Is Java 21 a complete Java program?
Jul 5, 2024 · In this article, we discussed a few notable changes delivered in Java 21. We discussed record patterns, pattern matching for switches, string templates, sequenced collections, virtual threads, string templates, and the new KEM API. Other enhancements and improvements are spread across JDK 21 packages and classes.
Jan 21, 2024 · Learn the new features in Java 21 LTS, including Virtual Threads, Unnamed classes, Sequenced Collections, Scoped Values, and Record Patterns.
Sep 19, 2023 · Java™ SE Development Kit 21. These notes describe important changes, enhancements, removed APIs and features, deprecated APIs and features, and other information about JDK 21 and Java SE 21. In some cases, the descriptions provide links to additional detailed information about an issue or a change.
- Virtual Threads – Jep 444
- Sequenced Collections – Jep 431
- Record Patterns – Jep 440
- Pattern Matching For Switch – Jep 441
- New Methods in String, Stringbuilder, Stringbuffer, Character, and Math
- Preview and Incubator Features
- Other Changes in Java 21
- Summary
When scaling server applications, threads are often a bottleneck. Their number is limited, and they often have to wait for events, such as the response of a database query or a remote call, or they are blocked by locks. Previous approaches, such as CompletableFutureor reactive frameworks, result in code that is extremely difficult to read and maint...
What is the easiest way to access the last element of a list? Unless you use additional libraries or helper methods, in Java – so far – it is the following: In Java 21, we can finally replace this behemoth with a short and concise call: Perhaps you’ve also needed to access the first element of a LinkedHashSet? Until now, this required the following...
“Record Patterns” were first introduced in Java 19 as a preview feature. They can be combined with Pattern Matching for instanceof and Pattern Matching for switchto access the fields of a record without explicit casts and without using access methods. This sounds more complicated than it is. The best way to explain record patterns is with an exampl...
“Pattern Matching for switch” was first introduced in Java 17 as a preview feature and, in combination with Record Patterns, allows switch statements and expressions to be formulated over any object. Here is an example: Without Pattern Matching for switch, we would have to write the following less expressive code instead (thanks to Pattern Matching...
Not all changes can be found in the JEPs or release notes. For example, some new methods in String, StringBuilder, StringBuffer, Character, and Math can only be found in the API documentation. Conveniently there is the Java Version Almanac, with which one can compare different API versions comfortably.
Even though Java 21 is a Long-Term Support release, it contains new and resubmitted preview features. Preview features must be explicitly enabled with the VM option --enable-previewand are usually slightly revised in subsequent Java versions.
Let’s move on to the changes we won’t usually be confronted with on a daily basis. At least not directly. Unless, for example, we are responsible for selecting the garbage collector and its optimization. Then the two following JEPs should be interesting:
The new LTS release Java 21 brings one of the most significant changes in Java history with the finalization of virtual threads, which will significantly simplify the implementation of highly scalable server applications. Record Patterns, Pattern Matching for switch, Sequenced Collections, String Templates, and Unnamed Patterns and Variables(the la...
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Sep 19, 2023 · Java 21 has arrived in a production release with 15 features including virtual threads, a generational Z garbage collector, and a key encapsulation mechanism API.
Sep 21, 2023 · Explore new features in JDK 21, including virtual threads, record patterns, and sequenced collections. In an exciting development for Java developers, this September 19th marked the release of JDK 21.
Feb 1, 2024 · Arkadiusz Rosłoniec. Senior Java Developer / Team Project Leader. Another LTS Java release is already here, bringing some exciting changes and improvements. Let’s analyze the most important Java 21 features, check out how they work in practice, and try to predict their significance for the future of this technology.
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