Table of Contents

• Title and Copyright Information
• Preface
  • Audience
  • Documentation Accessibility
  • Diversity and Inclusion
  • Related Documents
  • Conventions
• 1 Java Language Changes Summary
• 2 Java Language Changes
  • Java Language Changes for Java SE 21
  • Java Language Changes for Java SE 20
  • Java Language Changes for Java SE 19
  • Java Language Changes for Java SE 18
  • Java Language Changes for Java SE 17
  • Java Language Changes for Java SE 16
  • Java Language Changes for Java SE 15
  • Java Language Changes for Java SE 14
  • Java Language Changes for Java SE 13
  • Java Language Changes for Java SE 12
  • Java Language Changes for Java SE 11
  • Java Language Changes for Java SE 10
  • Java Language Changes for Java SE 9
    • More Concise try-with-resources Statements
    • @SafeVarargs Annotation Allowed on Private Instance Methods
    • Diamond Syntax and Anonymous Inner Classes
    • Underscore Character Not Legal Name
    • Support for Private Interface Methods
• 3 Preview Features
• 4 String Templates
  • Basic Usage of String Templates
  • Embedded Expressions in String Templates
  • Multiline String Templates
  • The FMT Template Processor
  • The RAW Template Processor
  • Creating a Template Processor
    • Creating a Template Processor that Returns JSON Objects
    • Creating a Template Processor that Safely Composes and Runs Database Queries
    • Creating a Template Processor that Simplifies the Use of Resource Bundles
• 5 Unnamed Classes and Instance Main Methods
  • Flexible Launch Protocol
  • Selecting a main Method
  • Unnamed Classes
  • Growing a Program
• 6 Sealed Classes
• 7 Pattern Matching
  • Pattern Matching for the instanceof Operator
    • Scope of Pattern Variables
  • Pattern Matching for switch Expressions and Statements
    • Selector Expression Type
    • When Clauses
    • Qualified enum Constants as case Constants
    • Pattern Label Dominance
    • Type Coverage in switch Expressions and Statements
    • Inference of Type Arguments in Record Patterns
    • Scope of Pattern Variable Declarations
    • Null case Labels
  • Record Patterns
  • Unnamed Patterns and Variables
• 8 Record Classes
• 9 Switch Expressions
• 10 Text Blocks
• 11 Local Variable Type Inference