• JEP 430: String Templates (Preview)
• JEP 431: Sequenced Collections
• JEP 439: Generational ZGC
• JEP 440: record 패턴(cf. Tuple)
• JEP 441: switch 패턴 매칭
• JEP 442: Foreign Function & Memory API (Third Preview)
• JEP 443: 무명 패턴과 변수 (Preview)
• JEP 444: 가상 스레드(Virtual Threads)
• JEP 445: 메인 메소드의 무명 클래스와 인스턴스 (Preview)
• JEP 446: Scoped Values (Preview)
• JEP 448: Vector API (Sixth Incubator)
• JEP 449: Windows 32-bit x86 Port deprecated for Removal
• JEP 451: Prepare to Disallow the Dynamic Loading of Agents
• JEP 452: Key Encapsulation Mechanism API
• JEP 453: 구조화된 동시성(Structured Concurrency) (Preview)

JEP 445

public class HelloWorld { 
    public static void main(String[] args) { 
        System.out.println("Hello, World!");
    }
}
 
// JEP 445
void main() {
    System.out.println("Hello, World!");
}

• JEP 429: Scoped Values (Incubator)
• JEP 432: Record Patterns (Second Preview)
• JEP 433: Pattern Matching for switch (Fourth Preview)
• JEP 434: Foreign Function & Memory API (Second Preview)
• JEP 436: Virtual Threads (Second Preview)
• JEP 437: Structured Concurrency (Second Incubator)
• JEP 438: Vector API (Fifth Incubator)

• JEP 405: Record Patterns (Preview)
• JEP 422: Linux/RISC-V Port
• JEP 424: Foreign Function & Memory API (Preview)
• JEP 425: Virtual Threads (Preview)
• JEP 426: Vector API (Fourth Incubator)
• JEP 427: Pattern Matching for switch (Third Preview)
• JEP 428: Structured Concurrency (Incubator)

JEP 405

record Rectangle(int x, int y, int w, int h) {}
 
int area(Object o) {
    if (o instanceof Rectangle(int x, int y, int w, int h)) {
        return w * h;
    }
    return 0;
}

• JEP 400: UTF-8이 기본
• JEP 408: Simple Web Server
• JEP 413: Code Snippets in Java API Documentation
• JEP 416: Reimplement Core Reflection with Method Handles
• JEP 417: Vector API (Third Incubator)
• JEP 418: Internet-Address Resolution SPI
• JEP 419: Foreign Function & Memory API (Second Incubator)
• JEP 420: switch 패턴 매칭 (Second Preview)
• JEP 421: Finalization deprecated

• JEP 306: Restore Always-Strict Floating-Point Semantics
• JEP 356: Enhanced Pseudo-Random Number Generators
• JEP 382: New macOS Rendering Pipeline
• JEP 391: macOS/AArch64 Port
• JEP 398: Applet API deprecated
• JEP 403: Strongly Encapsulate JDK Internals
• JEP 406: switch 패턴 매칭 (Preview)
• JEP 407: RMI Activation 제거
• JEP 409: 봉인된 클래스(sealed)
• JEP 410: AOT and JIT Compiler
• JEP 411: Deprecate the Security Manager for Removal
• JEP 412: Foreign Function & Memory API (Incubator)
• JEP 414: Vector API (Second Incubator)
• JEP 415: Context-Specific Deserialization Filters

JEP 406

Object o = ...;
return switch (o) {
        case null       -> "Null";
        case String s   -> String.format("String %s", s);
        case Long l     -> String.format("long %d", l);
        case Double d   -> String.format("double %f", d);
        case Integer i && i > 0                            // refining patterns
                        -> String.format("positive int %d", i);
        case Integer i && i == 0 
                        -> String.format("zero int %d", i);
        case Integer i && i < 0 
                        -> String.format("negative int %d", i);
        default         -> o.toString();
    };
};

• JEP 338: 벡터 API (Incubator)
• JEP 347: C++14 언어 기능 활성화
• JEP 357: Mercurial에서 Git로 마이그레이션
• JEP 369: GitHub로 마이그레이션
• JEP 376: ZGC: Concurrent Thread-Stack Processing
• JEP 380: Unix-Domain Socket Channels
• JEP 386: Alpine Linux Port – not yet stable
• JEP 387: Elastic Metaspace
• JEP 388: Windows/AArch64 Port
• JEP 389: Foreign Linker API (Incubator)
• JEP 390: Warnings for Value-Based Classes
• JEP 392: 패키징 툴
• JEP 393: Foreign-Memory Access API (Third Incubator)
• JEP 394: instanceof 패턴 매칭
• JEP 395: Records (record - cf. Tuple)
• JEP 396: Strongly Encapsulate JDK Internals by Default
• JEP 397: Sealed Classes (Second Preview)

• JEP 339: Edwards-Curve Digital Signature Algorithm (EdDSA)
• JEP 360: 봉인된 클래스 (Preview)
• JEP 371: 히든 클래스
• JEP 372: Nashorn JavaScript Engine
• JEP 373: Reimplement the Legacy DatagramSocket API
• JEP 374: Disable and Deprecate Biased Locking
• JEP 375: Pattern Matching for instanceof (Second Preview)
• JEP 377: ZGC: A Scalable Low-Latency Garbage Collector
• JEP 378: Text Blocks('' """statements""" '')
• JEP 379: Shenandoah: A Low-Pause-Time Garbage Collector
• JEP 381: Remove the Solaris and SPARC Ports
• JEP 383: Foreign-Memory Access API (Second Incubator)
• JEP 384: Records (Second Preview)
• JEP 385: RMI Activation deprecated

JEP 360

package com.example.geometry;
 
public abstract sealed class Shape
    permits Circle, Rectangle, Square {...}

• JEP 305: instnaceof를 위한 패턴 매칭 (Preview)
• JEP 343: Packaging Tool (Incubator)
• JEP 345: NUMA-Aware Memory Allocation for G1
• JEP 349: JFR Event Streaming
• JEP 352: Non-Volatile Mapped Byte Buffers
• JEP 358: Helpful NullPointerExceptions
• JEP 359: Records (Preview)
• JEP 361: switch 표현 (Standard)
• JEP 362: Solaris and SPARC Ports deprecated
• JEP 363: Concurrent Mark Sweep (CMS) Garbage Collector
• JEP 364: ZGC on macOS
• JEP 365: ZGC on Windows
• JEP 366: ParallelScavenge + SerialOld GC Combination deprecated
• JEP 367: Pack200 Tools and API
• JEP 368: Text Blocks (Second Preview)
• JEP 370: Foreign-Memory Access API (Incubator)

JEP 305

if (obj instanceof String) {
    String s = (String)obj;
    System.out.println(s.length());
}
 
if (obj instanceof String s) {
    System.out.println(s.length());
}

JEP 359

record Point(int x, int y) { }
Point p = new Point(3, 4);
System.out.println(p.x());

• JEP 350: Dynamic CDS Archives
• JEP 351: ZGC: Uncommit Unused Memory
• JEP 353: Reimplement the Legacy Socket API
• JEP 354: switch 표현 (Preview)
• JEP 355: 텍스트 블럭 (Preview)

JEP 355

String html = """
              <html lang="en">
                  <body>
                      <p>Hello, world</p>
                  </body>
              </html>
              """;

• JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
• JEP 230: Microbenchmark Suite
• JEP 325: switch 표현 (Preview)
• JEP 334: JVM Constants API
• JEP 340: One AArch64 Port, Not Two
• JEP 341: Default CDS Archives
• JEP 344: Abortable Mixed Collections for G1
• JEP 346: Promptly Return Unused Committed Memory from G1

JEP 325

int ndays = switch(month) {
    case JAN, MAR, MAY, JUL, AUG, OCT, DEC -> 31;
    case APR, JUN, SEP, NOV -> 30;
    case FEB -> {
        if (year % 400 == 0) yield 29;
        else if (year % 100 == 0) yield 28;
        else if (year % 4 == 0) yield 29;
        else yield 28; }
};

• JEP 181: Nest-Based Access Control
• JEP 309: Dynamic Class-File Constants
• JEP 315: Improve Aarch64 Intrinsics
• JEP 318: Epsilon: A No-Op Garbage Collector
• JEP 320: Remove the Java EE and CORBA Modules
• JEP 321: HTTP Client (Standard)
• JEP 323: Local-Variable Syntax for Lambda Parameters
• JEP 324: Key Agreement with Curve25519 and Curve448
• JEP 327: Unicode 10
• JEP 328: Flight Recorder
• JEP 329: ChaCha20 and Poly1305 Cryptographic Algorithms
• JEP 330: Launch Single-File Source-Code Programs
• JEP 331: Low-Overhead Heap Profiling
• JEP 332: Transport Layer Security (TLS) 1.3
• JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
• JEP 335: Deprecate the Nashorn JavaScript Engine
• JEP 336: Deprecate the Pack200 Tools and API

A number of features from previous releases were dropped; in particular, Java applets and Java Web Start are no longer available. JavaFX, Java EE and CORBA modules have been removed from JDK.

• JEP 286: 지역 변수 타입 추론 (var)
• JEP 296: JDK Forest를 단일 저장소로 통합
• JEP 304: Garbage-Collector 인터페이스
• JEP 307: Parallel Full GC for G1
• JEP 310: Application Class-Data Sharing
• JEP 312: Thread-Local Handshakes
• JEP 313: Native-Header Generation Tool(javah) 제거
• JEP 314: Additional Unicode Language-Tag Extensions
• JEP 316: 다른 메모리 장치에서의 힙 할당
• JEP 317: 실험적인 Java-Based JIT 컴파일러
• JEP 319: 루트 인증서
• JEP 322: Time-Based Release Versioning

[[JEP 286]] 지역변수 타입 추론

var list = new ArrayList<String>(); // infers ArrayList<String>
var stream = list.stream();         // infers Stream<String>

• JSR 376: Project Jigsaw의 JDK 모듈화(Java Platform Module System)
• JavaDB
• JEP 193: Variable handles, define a standard means to invoke the equivalents of various java.util.concurrent.atomic and sun.misc.Unsafe operations
• JEP 213: Milling Project Coin, private 인스턴스 메소드에서 @SafeVarargs 어노테이션 허용; the try-with-resources 구문에서 효과적인 final 변수 사용 허용; 유추된 유형의 인수가 추론가능한 경우 익명 클래스에서 다이아몬드(<>) 허용; Complete the removal, begun in Java SE 8, of underscore from the set of legal identifier names; 인터페이스에서 private 메소드 지원
• JEP 222: jshell: The Java Shell (Read-Eval-Print Loop): JShell은 자바 언어를 위한 REPL 명령줄 인터페이스입니다.
• JEP 254: Compact Strings
• JEP 263: HiDPI graphics: automatic scaling and sizing
• JEP 266: Reactive Streams의 자바 구현을 포함하고, Reactive Streams에서 이전에 제공된 인터페이슬 포함하는 새로운 Flow 클래스를 포함하는 더 많은 동시성 업데이트.
• JEP 268: XML catalogs
• JEP 282: jlink: The Java Linker, create a tool that can assemble and optimize a set of modules and their dependencies into a custom run-time image. It effectively allows to produce a fully usable executable including the JVM to run it
• JEP 295: Ahead-of-Time Compilation, ahead-of-time compilation provided by GraalVM

• JSR 335, JEP 126: Project Lambda 에서 람다 표현식(lambda espressions, 클로저 clusures) 및 기존 구현을 해치지 않고 인터페이스에 메소드를 추가할 수 있는 default 메서드(가상 확장 메서드)를 언어 수준에서 지원.
• JEP 174: Project Nashorn, a JavaScript runtime which can run JavaScript code embedded within applications
• JEP 104: 자바 타입에 대한 어노테이션
• 부호 없는 정수 연산
• JEP 120: 반복적인 어노테이션
• JEP 150: Date and time API
• JEP 178: 정적으로 연결된 JNI 라이브러리
• JEP 153: Launch JavaFX applications (direct launching of JavaFX application JARs)
• JEP 122: Remove the permanent generation