README.md

Core Java Features

This repository contains Java examples that are designed to track and document the progress of Java Enhancement Proposals (JEPs), Java Specification Requests (JSRs), and Java Language Revisions (JLRs). These examples provide a comprehensive overview of the various changes, updates, and improvements made to the Java language and platform over time.

Note: Continuous improvements and bug fixes are made within the repository to produce better solutions.

Specifications & Practices

• Java 26 (March, 2026)

  • JEP 517: HTTP/3 for the HTTP Client API
  • JEP 500: Prepare to Make Final Mean Final

• Java 25 (September, 2025)

  • JEP 513: Flexible Constructor Bodies
  • JEP 512: Compact Source Files and Instance Main Methods
  • JEP 511: Module Import Declarations
  • JEP 506: Scoped Values

• Java 24 (March, 2025)

  • JEP 488: Primitive Types in Patterns, instanceof, and switch
  • JEP 495: Simple Source Files and Instance Main Methods
  • API Improvements
    • JEP 485: Stream Gatherers
    • JEP 487: Scoped Values

• Java 23 (September, 2024)

  • JEP 455: Primitive Types in Patterns, instanceof, and switch
  • JEP 467: Markdown Documentation Comments
  • JEP 474: ZGC: Generational Mode by Default
  • JEP 476: Module Import Declarations
  • JEP 477: Implicitly Declared Classes and Instance Main Methods
  • API Improvements
    • JEP 473: Stream Gatherers

• Java 22 (March, 2024)

  • JEP 458: Launch Multi-File Source-Code Programs

• Java 21 (September, 2023)

  • JEP 430: String Templates
  • JEP 431: Sequenced Collections
  • JEP 444: Virtual Threads
  • API Improvements
    • Unicode Emoji Methods
      • isEmoji(int codePoint)
      • isEmojiPresentation(int codePoint)
      • isEmojiModifier(int codePoint)
      • isEmojiModifierBase(int codePoint)
      • isEmojiComponent(int codePoint)
      • isExtendedPictographic(int codePoint)

• Java 17 (September, 2021)

  • JEP 409: Sealed Classes

• Java 16 (March, 2021)

  • JEP 395: Records

• Java 14 (March, 2020)

  • JEP 361: Switch Expressions
  • JEP 359: Records (Preview)
  • JEP 369: Text Blocks (Second Preview)
  • JEP 305: Pattern Matching for instanceof (Preview)

• Java 12 (March, 2019)

  • API Improvements
    • Compact Number Formatting

• Java 11 (September, 2018)

  • JEP 181: Nest-Based Access Control
  • JEP 318: Epsilon: A No-Op Garbage Collector
  • JEP 321: HTTP Client (Standard)
  • JEP 323: Local-Variable Syntax for Lambda Parameters
  • JEP 327: Unicode 10
  • JEP 329: ChaCha20 and Poly1305 Cryptographic Algorithms
  • JEP 332: Transport Layer Security (TLS) 1.3
  • API Improvements
    • New String Methods
      • isBlank()
      • lines()
      • repeat()
      • strip(), stripLeading(), stripTrailing()
    • New File Methods
      • readString(Path)
      • writeString(Path, CharSequence, OpenOption...)
      • writeString(Path.of("message.txt"), updatedMessage)
    • New Collection.toArray() Method

• Java 10 (March, 2018)

  • JEP 286: Local-Variable Type Inference
  • JEP 314: Additional Unicode Language-Tag Extensions
  • JEP 322: Time-Based Release Versioning
  • API Improvements
    • Standard Class Libraries
      • java.lang.management.RuntimeMXBean.getPid(): Returns the pid of the running JVM.
    • New Collection Methods
      • List.copyOf()
      • Set.copyOf()
      • Map.copyOf()
    • New Stream Methods
      • Collectors.toUnmodifiableList()
      • Collectors.toUnmodifiableSet()
      • Collectors.toUnmodifiableMap()
      • Optional.orElseThrow()

• Java 9 (September, 2017)

  • JEP 110: HTTP/2 Client
  • JEP 213: Milling Project Coin
    • The try-with-resources Improvements
    • Private Methods in the Interface
    • Using underscores in numeric literals
    • SafeVarargs to Support Private Methods

• Java 8 (March, 2014)

  • JEP 135: Base64 Encoding & Decoding
  • JEP 174: Nashorn JavaScript Engine
  • JEP 150: Date & Time API
  • JEP 107: Bulk Data Operations for Collections (java.util.stream)
  • JSR 335
    • Lambda Expressions
    • Default Methods in Interfaces
    • Functional Interfaces
    • Optional
    • Method References
  • API Improvements
    • java.util.IntSummaryStatistics
    • java.util.LongSummaryStatistics
    • java.util.DoubleSummaryStatistics

Notes

• The Java Version Almanac
• JDK Release Notes
• Place to get early releases from Oracle's JDK
• OpenJDK Projects
• List of all Java Specification Requests (JSRs)
• What is the difference (or relation) between JLS, JSR and JEP?
• Maven Plugins Compatibility Plan
• VM Options Explorer
• Java modules published at Maven Central
• Java upgrade example errors and solutions