Thinking outside the box

0001-01-01 1 min read

The following describes selected improvements of the Java language. See the Java 19 release notes. See Java Language Updates for Java SE 19.

Java 19 is introducing the following language enhancements as developer preview.

JEP 405 is starting with Record Patterns as developer preview
JEP 420 is continuing with Pattern Matching for switch.
JEP 425 is starting with Virtual Threads.
JEP 428 is starting with Structured Concurrency.

0001-01-01 1 min read

The following describes selected improvements of the Java language. See the Java 17 release notes. See Java Language Updates for Java SE 17.

With JEP 409 Sealed Classes are now leaving preview state and are finally available for production.

Java 17 is introducing the following language enhancements as developer preview.

0001-01-01 1 min read

Sealed Class Permits

Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/seventeen/lang/SealedClasses.java[tags=Shape;Ellipsis;Circle;Rectangle]

The new keyword permits declares which subclasses are allowed.
Subclasses may be sealed,
final or,
non-sealed

Sealed Class Subclasses In Same Sourcefile

Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/seventeen/lang/SealedClasses.java[tags=Ellipsis;Circle]

The permits declaration can be omitted when
the subclasses are in the same source file.

0001-01-01 1 min read

Day Period Support

Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/sixteen/api/DayPeriodSupport.java[tag=dayPeriodSupport]

0001-01-01 1 min read

The following describes selected improvements of the Java API. See the Java 16 release notes.

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

0001-01-01 1 min read

Stream.toList()

Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/sixteen/api/StreamApi.java[tag=toList]

0001-01-01 1 min read

The following describes selected improvements of the Java language. See the Java 16 release notes. See Java Language Updates for Java SE 16.

With JEP 394, Pattern Matching for instanceof introduced in {java14} is moving from preview state to final availability.

With JEP 395, Record introduced in {java14} is moving from preview state to final availability.

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