filterNotNull()

Implementation Notes

This gatherer removes null elements from the stream. The input type is @Nullable TYPE and the output type is TYPE, making it useful for bridging a nullable stream into a null-safe pipeline without an explicit cast.

Signature

filterNotNull()

Examples

Remove nulls from a mixed stream

Stream
    .of("A", null, "B", null, "C")
    .gather(Gatherers4j.filterNotNull())
    .toList();

// ["A", "B", "C"]

A stream of all nulls produces an empty list

Stream
    .of(null, null, null)
    .gather(Gatherers4j.filterNotNull())
    .toList();

// []