Java 21

Text Blocks Double StringBuilder MonthDay Text Blocks InstantSource Duration DayOfWeek Handling Date, Time, Text, Numeric and Boolean Values

Switch Expressions Branching Statements The for Statement Controlling Program Flow

Classes Interfaces Nested Classes Sealed Classes Default Methods Enum Types Pattern Matching with Switch Records Class Comparator Byte Implicit Casting Widening primitive Blocks and Statements Using Object-Oriented Concepts in Java

try-with-resources Assertions FileNotFoundException IOException NoSuchElementException Handling Exceptions

ArrayDeque HashSet ArrayList TreeSet Map Arrays TreeMap Working with Arrays and Collections

FR: BR:

🛡️ Sealed	🪆 Pattern Matching	💾 Record	🔀 Switch	🧱 Textblock
Classes Constraints Interfaces Record Narrowing APIs	instanceof switch selector when enum dominance type coverage record inference pattern scope null case records pattern unnamed patterns unnamed variables	Records Canonical Constructor Explicit Class Members Features Local Record Classes Static Members of Inner Classes Record Serialization APIs	Labels Yield Expressions Exhaustiveness Statements Exhaustiveness	Text Blocks Syntax Final new line Incidental white space Trailing White space White space issues Line Terminators Escape sequences String Methods G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12

        88                                        ad888888b,      88
        88                                       d8"     "88    ,d88
        88                                               a8P  888888
        88  ,adPPYYba,  8b       d8  ,adPPYYba,       ,d8P"       88
        88  ""     `Y8  `8b     d8'  ""     `Y8     a8P"          88
        88  ,adPPPPP88   `8b   d8'   ,adPPPPP88   a8P'            88
88,   ,d88  88,    ,88    `8b,d8'    88,    ,88  d8"              88
"Y8888P"   `"8bbdP"Y8      "8"      `"8bbdP"Y8  88888888888      88

java.util.function lambda Collectors BiFunction IntPredicate streams Optional function.compose Stream Function BiConsumer ObjIntConsumer IntStream IntSupplier ToLongFunction LongFunction UnaryOperator IntUnaryOperator BinaryOperator Working with Streams and Lambda expressions

javac Command JPMS java Command Packaging and Deploying Java Code

Virtual Threads Callable Runnable CyclicBarrier Thread RecursiveTask Executor ExecutorService Executors AtomicInteger ReentrantLock ConcurrentMap Managing Concurrent Code Execution

Files DataOutputStream Data Streams FileWriter override file Character Streams DateTimeFormatter PrintWriter Console ObjectOutputStream System FileVisitor SimpleFileVisitor NoSuchFileException DosFileAttributes PosixFileAttributes BasicFileAttributes BufferedWriter BufferedReader constructors Using Java I/O API

DecimalFormat Customizing Formats Locale NumberFormat Implementing Localization