Java Features By Version

Java 8

https://www.oracle.com/java/technologies/javase/8-whats-new.html

• Functional Interfaces and Lambda Expressions

• Default and static methods in Interfaces.

• for example, forEach() default implementation in Iterable interface

default void forEach(Consumer<? super T> action) {
    Objects.requireNonNull(action);
    for (T t : this) {
        action.accept(t);
    }
}

• Method references provide easy-to-read lambda expressions for methods that already have a name.
• Java Stream
  • java.util.stream package provide a Stream API to support functional-style operations on streams of elements. The Stream API is integrated into the Collections API, which enables bulk operations on collections, such as sequential or parallel map-reduce transformations.
• Java Date-Time Packages
  • java.time - Classes for date, time, date and time combined, time zones, instants, duration, and clocks.
  • java.time.chrono - API for representing calendar systems other than ISO-8601. Several predefined chronologies are provided and you can also define your own chronology.
  • java.time.format - Classes for formatting and parsing dates and time.
  • java.time.temporal - Extended API, primarily for framework and library writers, allowing inter operations between the date and time classes, querying, and adjustment. Fields and units are defined in this package.
  • java.time.zone - Classes that support time zones, offsets from time zones, and time zone rules.
• Concurrency Utilities Enhancements
• Java IO improvements

Java 9

https://docs.oracle.com/javase/9/whatsnew/toc.htm#JSNEW-GUID-DB9EB298-4944-4BF9-9CE0-B4A884F8294F

• Introduces module
• Introduces jshell
• Add support for private interface methods.

Java 10