New Features of JDK 13
summary
JDK 13 introduces App CDS for application classes to automatically create and reuse shared class-data archives from an app’s actual classpath, reducing manual steps and improving startup and memory usage. The ZGC garbage collector can now return unused heap memory to the OS (default threshold 5 MB) so long-running processes can shrink RSS after idle periods. Two language preview features — refined switch expressions and text blocks — are included and require --enable-preview at compile time, with compiled classes marked to signal preview usage to toolchains.
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chapters (8)
- 0:00JDK 13 overview
- 1:14Class data archive
- 7:14ZGC memory release
- 16:15JFR API changes
- 23:23Preview features
- 33:18Switch expressions
- 41:16Text blocks
- 46:02JDK 13 summary
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