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

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We can take (accept) stream elements matching a predicate.

We can drop stream elements matching a predicate.

Generate a stream using an iteration.

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

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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.