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JDK 21: The new features in Java 21

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Introduction to JAVA 21

The feature set for Java Development Kit (JDK) 21, due September 19 as the next long-term support (LTS) release of Oracle’s standard Java implementation, is officially frozen. Java 21 will have 15 features, as a previously proposed 16th feature, the experimental Shenandoah garbage collector, was dropped last week.

Embrace the future of Java development with JDK 21 – your gateway to innovation in software engineering. Dive into the comprehensive features of the Java Development Kit, including advanced tools, enhanced performance capabilities, and robust functionality. Stay at the forefront of Java programming with the latest updates. Explore JDK 21 release notes and seamlessly integrate cutting-edge improvements into your Java projects. Elevate your development experience and propel your applications forward with the power of JDK 21.”

The 15 features that made the final cut range from previews of string templates and structured concurrency to virtual threads to a key encapsulation mechanism (KEM) API. JDK 21 reached an initial ramp-down phase on June 8, with the finalization of both features and bug fixes. A second rampdown phase is scheduled to begin on July 20. Release candidates are due August 10 and August 24.

Early-access binaries under the GPL are available at jdk.java.net. Oracle publishes new releases of standard Java every six months, with the most recent, JDK 20, having arrived on March 21. The specific proposals for JDK 21 include: