Helper classes

Stephen Colebourne scolebourne at
Mon Apr 15 01:53:00 PDT 2013

Currently, Project Lambda has a number of helper clases, notably
Collectors and Streams, which are clearly related to the interface.
Since JDK8 has static methods on interfaces, are there plans to move
the static methods to the interface?

This would allow methods such as  intBuilder(), emptyIntStream() and
singletonIntStream(int t) to be on IntStream rather than on Stream,
and thus have the simpler names of builder(), emptyStream(),

Making the change might also affect some method names, as sometimes
they read differently, or are otherwise confusing, when on the

As a note, on JSR-310, we did move the methods from similar static
helper classes to the interfaces:
although I'm not sure that counts as precedent yet.


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