The following describes selected improvements of the Java language. See the Java 9 release notes.

Unresolved directive in <stdin> - include::TryWithResource.adoc[leveloffset=+1] Unresolved directive in <stdin> - include::PrivateInterfaceMethod.adoc[leveloffset=+1]

An interface can now have private methods. These can simplify implementing default methods.

Before Java 9 a variable referencing a resource had to be redeclared (and assigned) in the try block in order to be automatically closed.

Variables that are effectively final can be used in a try with resource block (and don’t have to be redeclared).

It is now possible to create pre allocated hash maps and hash sets through a set of new factory methods on Set and Map implementations.

The formatted value is Sep 2022. Read more about the pattern template in the API documentation.

The formatted value is Sep 2022. Read more about the pattern template in the API documentation.

The following describes selected improvements of the Java API. See the Java 19 release notes.

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The following describes selected improvements of the Java JVM. See the Java 19 release notes.

Class data sharing (CDS) now has an option -XX:+AutoCreateSharedArchive to automatically create or update a CDS archive for an application..