Java 17 Tutorial — Complete Guide

A complete, expert-level Java 17 tutorial series. Master every feature of Java's most significant LTS release since Java 8 — Records, Sealed Classes, Pattern Matching, Text Blocks, Switch Expressions, Enhanced PRNGs, Deserialization Filters, and more.

Java 17 Tutorial — Complete Guide

Java 17 is the most significant LTS release since Java 8. Released September 14, 2021, it delivers five years of language evolution in one supported baseline — Records that eliminate data-class boilerplate, Sealed Classes that give the compiler exhaustive knowledge of your type hierarchy, Pattern Matching that cuts through verbose instanceof chains, and Text Blocks that make embedded strings readable again. This series covers every JEP, every language feature, and the complete migration path from Java 8 and Java 11.

14 articles. Every JEP. Production-grade guidance throughout.

Part 1: Introduction and Setup

  1. Java 17: The LTS That Delivers — What Changed from Java 11
  2. Setting Up Java 17: JDK Options, Tooling, and IDE Configuration

Part 2: Language Features — New Since Java 11

  1. Text Blocks (JEP 378): Multiline Strings Without the Escape Hell
  2. Records (JEP 395): Immutable Data Classes Without the Boilerplate
  3. Pattern Matching for instanceof (JEP 394): Smarter Type Checks
  4. Switch Expressions (JEP 361): Switch as an Expression
  5. Sealed Classes (JEP 409): Controlled, Exhaustive Class Hierarchies

Part 3: Preview Language Feature

  1. Pattern Matching for switch (JEP 406): Type Dispatch in switch (Preview)

Part 4: Platform and API Improvements

  1. Enhanced Pseudo-Random Number Generators (JEP 356): A Modern PRNG API
  2. Context-Specific Deserialization Filters (JEP 415): Securing Java Deserialization
  3. JDK Encapsulation and Removed APIs (JEP 403, 407, 411): What It Means for Your Code

Part 5: Advanced Platform Features

  1. Foreign Function & Memory API (JEP 412): First Look at Project Panama

Part 6: Migration and Production

  1. Migrating to Java 17: From Java 8 and Java 11 — Step by Step
  2. Java 17 Production Checklist and Performance Best Practices

What You Will Learn

  • Records — eliminating equals, hashCode, toString, and accessor boilerplate
  • Sealed Classes — restricting class hierarchies for exhaustive pattern matching
  • Text Blocks — multiline strings with correct indentation handling
  • Pattern Matching for instanceof — eliminating the redundant cast after type check
  • Switch Expressions — switch as a value-yielding expression with arrow syntax
  • Pattern Matching for switch (Preview) — type dispatch in switch statements
  • Enhanced PRNGs — the new RandomGenerator API and LXM algorithm family
  • Deserialization Filters — protecting against gadget-chain deserialization attacks
  • Strong JDK Encapsulation — what breaks, what to do, and the long-term path
  • Foreign Function & Memory API — first look at calling native code without JNI
  • How to migrate from Java 8 and Java 11 to Java 17 without breaking existing code

Prerequisites

  • Java programming experience (any version)
  • Basic understanding of JVM concepts (GC, threads, class loading)

No prior Java 17 experience needed.