What’s New in JDK 14? 16 Game‑Changing Features You Need to Know
On March 17, JDK 14 was officially released, bringing 16 new JEPs—including pattern‑matching for instanceof, a new packaging tool, enhanced G1 memory allocation, JFR event streaming, helpful NullPointerExceptions, records, switch expressions, ZGC on macOS/Windows, and a second preview of Text Blocks—significantly expanding Java’s core capabilities.
On March 17, JDK/Java 14 was officially GA.
This version contains 16 new JEPs, more than Java 12 and 13 combined.
JEP 305: Pattern Matching for instanceof (Preview) Introduces pattern matching for the instanceof operator, allowing more concise and safer code by extracting components from an object based on conditions.
JEP 343: Packaging Tool (Incubator) Provides a tool for packaging self‑contained Java applications.
JEP 345: NUMA‑Aware Memory Allocation for G1 Improves G1 performance on large machines by implementing NUMA‑aware memory allocation.
JEP 349: JFR Event Streaming Exposes JDK Flight Recorder data for continuous monitoring.
JEP 352: Non‑Volatile Mapped Byte Buffers Adds a new file‑mapping mode that allows the FileChannel API to create MappedByteBuffer instances referencing non‑volatile memory (NVM).
JEP 358: Helpful NullPointerExceptions Enhances NullPointerExceptions by describing which variables are null, improving the usefulness of JVM‑generated exceptions.
JEP 359: Records (Preview) Introduces a compact syntax for declaring shallowly immutable data carrier classes.
JEP 361: Switch Expressions (Standard) Promotes switch expressions to a standard feature, allowing them to be used as statements or expressions with simplified case syntax.
JEP 362: Deprecate the Solaris and SPARC Ports Deprecates Solaris/SPARC, Solaris/x64, and Linux/SPARC ports for future removal.
JEP 363: Remove the Concurrent Mark Sweep (CMS) Garbage Collector Removes the CMS garbage collector.
JEP 364: ZGC on macOS Ports the Z Garbage Collector to macOS.
JEP 365: ZGC on Windows Ports the Z Garbage Collector to Windows.
JEP 366: Deprecate the ParallelScavenge + SerialOld GC Combination Deprecates the ParallelScavenge + SerialOld GC combination.
JEP 367: Remove the Pack200 Tools and API Removes the pack200 and unpack200 tools and the Pack200 API from java.util.jar.
JEP 368: Text Blocks (Second Preview) Adds multiline string literals similar to Python’s triple‑quote syntax, improving readability when embedding large text blocks such as HTML in Java code.
JEP 370: Foreign‑Memory Access API (Incubator) Introduces an API that allows Java programs to safely and efficiently access memory outside the Java heap.
For more details, see http://openjdk.java.net/projects/jdk/14/ . Production‑ready binary downloads are available at http://jdk.java.net/14/ .
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Programmer DD
A tinkering programmer and author of "Spring Cloud Microservices in Action"
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