Introduction to Java SE 25

Java SE 25 is poised to mark a significant advancement in the Java platform as the fourth Long-Term Support (LTS) release under Oracle’s six-month release cadence. It is expected to be officially released in September 2027, ensuring sustained support and updates for enterprise and production environments.

Quick Facts about Java SE 21

  • Official Release Date: September 2027
  • LTS Support End Date: September 2035
  • Download Link: Not available yet

Key Highlights

  • Unnamed Variables & Patterns: Simplify code by allowing the use of unnamed variables and patterns, making the code more concise and reducing boilerplate.
  • Launch Multi-File Source Code Programs: Enable the execution of multi-file programs without needing to compile them first, streamlining the development process and making it easier to test and run multi-file applications quickly.


  • This course focuses exclusively on Long-Term Support (LTS) versions and standardized features.
  • You will not encounter preview or incubator features, nor non-LTS versions.
  • Instead, you’ll see features once they’re officially standardised, and features from non-LTS versions will be included in the next LTS versions’ summary and deep dive.
  • This chapter assumes familiarity with the previous LTS version of Java (Java 21).
  • We will cover all new features from every version since Java 21, including those from Java 22 through Java 24, leading up to and including Java 25.