JDK 20: What’s subsequent for Java?

With Java 19 having simply arrived on September 20, Java 20 is subsequent on the docket, anticipated in March 2023. The discharge probably might add new performance for common generics, immutable information, and string templates and finalize capabilities comparable to document patterns.

The present OpenJDK webpage for JDK 20 lists no formally proposed options as of September 23, however that may change quickly sufficient. Capabilities that might make it into Java 20 embody:

• Common generics, to unify the therapy of reference and primitive varieties in generic code. This proposal has been floating for some time and didn’t make it into JDK 19.
• Extent-local variables, to allow sharing of immutable information inside and throughout threads.
• String templates, to simplify Java programming by making it straightforward to specific strings that embody values computed at run time.
• Worth objects, to reinforce the Java object mannequin with class cases which have solely ultimate cases and lack object identification.
• Primitive lessons, that are particular sorts of worth lessons that outline new primitive varieties.
• Sequenced collections, offering a Assortment interface to symbolize a group with an outlined encounter order.
• An API for asynchronous stack traces, which would supply info on Java and native frames.
• A classfile API, to parse, generate, and rework Java class information.
• File patterns, previewed in JDK 19, for deconstructing document values.
• International perform and reminiscence API, previewed in JDK 19 as a mechanism for Java applications to interoperate with code and information exterior the Java runtime.
• One other JDK 19 preview characteristic, digital threads, serves as light-weight threads to make it simpler to write down and preserve high-throughput concurrent purposes.
• A vector API, incubated for a fourth time in JDK 19, expresses vector computations that reliably compile at runtime to optimum directions on supported CPU architectures, attaining higher efficiency than scalar computations.
• Structured concurrency, in an incubator part in JDK 19, would simplify multithreaded programming through an API.
• Sample matching for swap expressions and statements, previewed for a 3rd time in JDK 19, to reinforce Java programming.

Primarily based on commonplace Java’s six-month launch cadence, Java 20, or Java Growth Equipment 20, would arrive as a manufacturing launch in March 2023. Like JDK 19, JDK 20 can be a short-term launch with solely six months of premium help from Oracle. The next JDK 21 is due in a yr and can be an LTS (Lengthy Time period Help) launch with a number of years of backing by Oracle.