Why does the java.util.Set interface not provide a get(Object o) method? [closed]

Answer 1

Functional Java has an implementation of a persistent Set (backed by a red/black tree) that incidentally includes a split method that seems to do kind of what you want. It returns a triplet of:

1. The set of all elements that appear before the found object.
2. An object of type Option that is either empty or contains the found object if it exists in the set.
3. The set of all elements that appear after the found object.

You would do something like this:

MyElementType found = hayStack.split(needle)._2().orSome(hay);