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Awesome!Coroutines are finally here!Thread is about to be in the past

2022-08-03 15:33:00 【Brother migrant worker】

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Produced | OSC Open Source Community (ID: oschina2013)

From the JDK 19 overview page, JDK 19 is in Rampdown Phase Two, the entire feature set has been frozen, and there will be no more changes to the JEP.

Java 19 has only 7 new features:

A brief introduction to the new features follows:

Record Mode (Preview)

Using Record Patterns to enhance the Java programming language to deconstruct record values, record patterns and type patterns can be nested, enabling powerful, declarative, and composable forms of data navigation and manipulation.

This is a preview language feature.

Linux/RISC-V porting

Porting the JDK to Linux/RISC-V, currently only supports the RV64GV configuration of RISC-V (generic 64-bit ISA with vector instructions).Support for other RISC-V configurations, such as the Generic 32-bit configuration (RV32G), may be considered in the future.

External Functions and Memory API (Preview)

Introduces an API through which Java programs can interoperate with code and data outside of the Java runtime.This API enables efficient calls to external functions (code outside the JVM) and safe access to external memory (memory not managed by the JVM), enabling Java programs to call native libraries and process native data without JNIvulnerability and danger.

This is a preview API.

Virtual Threads (Preview)

Introduces coroutines, or virtual threads, to the Java platform.Virtual threads are lightweight threads that can significantly reduce the workload of writing, maintaining, and observing high-throughput concurrent applications.This is a preview API, which was covered in detail by the stack leader.

Vector API (fourth hatch)

Introduces an API to express vector computations that compile reliably at runtime, optimizing vector instructions on supported CPU architectures to achieve better performance than scalar computations.

Switch Pattern Matching (Preview 3)

Enhance the Java programming language with pattern matching for switch expressions and statements, and extensions to the pattern language.Extending pattern matching into switch allows expressions to be tested against some patterns, so that complex data-oriented queries can be expressed concisely and safely.

This feature first appeared as a preview in Java 17, and Java 19 is the third preview.

Structured concurrency (incubation stage)

Simplifies multithreaded programming by introducing an API for structured concurrency, which treats multiple tasks running in different threads as a single unit of work, simplifying error handling, improving reliability, and enhancing observability.

This is an incubating API.