JDK 18 Release Highlights and New Features

Java Development Kit (JDK) 18 was released on March 22, 2022, bringing nine new standard Java features that were frozen on December 9 and entered the first Ramp‑down phase.

JDK 17 is a long‑term support (LTS) version with at least eight years of Oracle support, whereas JDK 18 is a short‑term feature release supported for only six months.

The early‑access builds for Linux, Windows, and macOS can be found at https://jdk.java.net/18/ .

JDK 18 New Features Overview:

JEP 400 : Sets UTF‑8 as the default charset for the standard Java API, ensuring consistent behavior across implementations, operating systems, locales, and configurations.

JEP 408 : Introduces a simple web server command‑line tool that serves static files, useful for prototyping, temporary coding, and testing, especially in educational settings.

JEP 413 : Adds the @snippet tag to JavaDoc’s Standard Doclet, simplifying the inclusion of example source code in API documentation.

JEP 416 : Re‑implements core reflection on top of method handles in java.lang.invoke , refactoring java.lang.reflect methods, constructors, and fields to reduce API maintenance and development costs.

JEP 417 : Provides the Vector API (third incubator) to express vector computations that the runtime can compile to optimal CPU vector instructions, delivering performance superior to equivalent scalar code.

JEP 418 : Defines an Internet address resolution SPI, allowing java.net.InetAddress to use resolvers other than the platform‑built‑in one.

JEP 419 : Introduces the foreign function and memory API (second incubator), enabling Java programs to interoperate with native code and memory safely without the fragility of JNI.

JEP 420 : Adds pattern‑matching for switch expressions and statements, extending the language to allow concise, safe data‑centric queries.

JEP 421 : Deprecates the Finalization feature, encouraging migration to alternatives such as try‑with‑resources and cleaners due to its unpredictability and performance issues.

The second Ramp‑down phase begins on January 20, 2022, with the initial and final release candidates scheduled for February 10 and February 24, respectively; the stable JDK 18 release arrives on March 22, 2022, with updates posted on the JDK announcement page.

JDK Announcement Page

https://openjdk.java.net/projects/jdk/18/

Which Java version are you using now? Let us know in the comments!