Beyond Java 8: The Cool Stuff

Java is evolving rapidly. Henri Tremblay is walking through the cool stuff. Henri is, besides other activities a contributor to EasyMock

From Java 7 (2011) to Java 19 (2022)

Unless stated otherwise Java 17 (2021) LTS will work for the examples. Henri used a trading app to walk through upgrading steps.

Impressive: just moving from Java 8 to Java 19 shows double digit performance improvements

Some of the tips:

• use the java.time.Clock object for anything date/time, Don't use Date. Inject the clock object.
• use Comparators
• use Files.lines to read by line
• use the Maven deamon to speed compilation
• Be careful with stream().findAny() - in most cases a Map performs way better
• Use """ text blocks (why o why did Java not pick the tripple backtick)
• Use Files.writeString if it is a String you write
• Use jlink and jpackage for distribution
• Use switch expressions which returns values (not convinced about that yet)
• Use Records for immutable data
• Use the new instanceof syntax
• Use the new RandomGenerator for better performance
• Sealed types allow tighter controls

A quite enjoyable session