Java 12

JEP 325: Switch Expressions (Preview) (opens in a new tab)

Java 13

JEP 354: Switch Expressions (Second Preview) (opens in a new tab)

Java 14

JEP 305: Pattern Matching for instanceof (Preview) (opens in a new tab)

JEP 361: Switch Expressions (opens in a new tab)

• Arrow labels
• Switch expressions
  • The cases of a switch expression must be exhaustive; for all possible values there must be a matching switch label.
• Yielding a value

Collection Factories

Stream API

• takeWhile() and dropWhile()

  • filter() operation looks through the entire collection and gathers all elements that match the predicate, whereas takeWhile() short-circuits this process by stopping the operation once it encounters an element that does not match the predicate, which makes takeWhile() faster.
  • Performance suffers if takeWhile() or dropWhile() are used on parallel streams, even when the streams are ordered.
  • Resources
    • Records Come to Java - A first look at how Java 14’s data records will change the way you code (opens in a new tab)
    • Java 9 Core Library Updates: Collections and Streams (opens in a new tab)

Java 15

JEP 360: Sealed Classes (Preview) (opens in a new tab)

JEP 371: Hidden Classes (opens in a new tab)

JEP 375: Pattern Matching for instanceof (Second Preview) (opens in a new tab)

JEP 378: Text Blocks (opens in a new tab)

• Programmer's Guide to Text Blocks (opens in a new tab)

Java 16

JEP 380: Unix-Domain Socket Channels (opens in a new tab)

JEP 394: Pattern Matching for instanceof (opens in a new tab)

JEP 395: Records (opens in a new tab)

• Oracle - Java SE - 17 - Java Language Updates - 5 Record Classes (opens in a new tab)

• Java Magazine - Bruce Eckel on Java records (opens in a new tab)

• Resolve the issue Records do not conform to the JavaBeans specification.

  Use Lombok @Setter and @Getter annotations on fields.

  record Order(@Getter Integer id,
               @Getter String customerName) {}

JEP 397: Sealed Classes (Second Preview) (opens in a new tab)

Java 17

JEP 409: Sealed Classes (opens in a new tab)

• Resources

  • Oracle Help Center - JDK 17 Documentation - Home (opens in a new tab)
  • Oracle Help Center - JDK 17 Documentation - Guides (opens in a new tab)