LookaheadIterator

Class LookaheadIterator is a base class that lets you easily implement iterators that need to calculate the next value in order to let hasNext() return whether or not there is a next value.

StreamLikeIterator

Interface StreamLikeIterator extends Iterator to add several Stream operations. Unlike streams, instances of StreamLikeIterator support removal if a) the original iterator does, and b) no intermediate step removes support for removal (e.g., flatMap).

IteratorUtils

Class IteratorUtils provides several utility methods. These include:

• singletonIterator to create an (unmodifiable) iterator containing only a single element.
• unmodifiableIterator to create an unmodifiable wrapper around an iterator.
• methods to wrap an existing iterator to add functionality of Stream. This allows single operations to be used without having to use StreamLikeIterator.
• methods to create a Stream for an iterator.
• methods to create a single iterator backed by several other iterators or iterables.