Turns a Scala function into a Java Function.
Turns a Scala function into a Java Function. In other words, returns f.asJava.
Turns a Scala function returning a Scala Option into a Java function returning a Java Optional.
Turns a Scala function returning a Scala immutable IndexedSeq into a Java function returning a Java Stream.
Turns a Java Optional into a Java Stream, for lack of such a conversion in Java 8.
Utility for creating element Streams, etc. It is a very small wrapper around some functions offered by the scala-java8-compat library. It is mainly used internally, but can also be used in user code.