Java 13 Features | All Java JDK 13 new features at glance | Java Beam

Text Blocks (Preview)
Switch Expressions Enhancements (Preview)
FileSystems.newFileSystem() Method

DOM and SAX Factories with Namespace Support
Reimplement the Legacy Socket API
Dynamic CDS Archive
ZGC: Uncommit Unused Memory

Text Blocks:
This is a preview feature. It allows us to create multiline strings easily. The multiline string has to be written inside a pair of triple-double quotes.

The string object created using text blocks has no additional properties. It’s an easier way to create multiline strings. We can’t use text blocks to create a single-line string.

The opening triple-double quotes must be followed by a line terminator.

Switch Expressions Enhancements (Preview):
Switch expressions were added as a preview feature in Java 12 release. It’s almost same in Java 13 except that the “break” has been replaced with “yield” to return a value from the case statement.

FileSystems.newFileSystem() Method:
New methods have been added to read content as a file system.

Reimplement the Legacy Socket API: Socket is reimplemented in java 13 using nio package.
The underlying implementation of the java.net.Socket and java.net.ServerSocket APIs have been rewritten. The new implementation, NioSocketImpl, is a drop-in replacement for PlainSocketImpl.

It uses java.util.concurrent locks rather than synchronized methods. If you want to use the legacy implementation, use the java option -Djdk.net.usePlainSocketImpl.

Dynamic CDS Archive:
class-data sharing feature, which was introduced in Java 10. Now, the creation of CDS archive and using it is much easier.

ZGC: Uncommit Unused Memory:
enhanced ZGC to return unused heap memory to the operating system. The Z Garbage Collector was introduced in Java 11. It adds a short pause time before the heap memory cleanup. But, the unused memory was not being returned to the operating system. This was a concern for devices with small memory footprint such as IoT and microchips. Now, it has been enhanced to return the unused memory to the operating system.

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