The following describes selected improvements of the Java API. See the Java 14 release notes.
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The following describes selected improvements of the Java JVM. See the Java 14 release notes.
The following describes selected improvements of the Java language. See Java Language Changes for Java SE 14
Java 14 is introducing the following language enhancements as developer preview.
Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/fourteen/lang/SwitchExpressions.java[tag=switchExpression]The compiler warns when cases are not exhausted.
A default clause is required.
However, for enum switch expressions that cover all known constants,
the compiler inserts an implicit default clause.
By applying a filter predicate we can adapt a collector to accept only elements matching a predicate.
Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/nine/api/CollectorsApi.java[tag=filtering]With the new flatMapping method a stream of streams or stream of collections a collector is adapted to return a flattened result.
Factory methods have been added to the Collections class for simplifying list creation.
Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/nine/api/ImmutableListFactory.java[tag=immutableEmptyList]Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/nine/api/ImmutableListFactory.java[tag=immutableEmptyListJava9]Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/nine/api/ImmutableListFactory.java[tag=immutableListJava8]Factory methods have been added to the Collections class for simplifying map entry creation.
Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/nine/api/ImmutableMapEntryFactory.java[tag=immutableEmptyMap]Unresolved directive in <stdin> - include::../../../../../../../../src/main/java/nine/api/ImmutableMapEntryFactory.java[tag=immutableMap]