All the classes released in Java 2 that implement the collection interface contain an iterator () method, which returns an instance of the Iterator. There's nearly universal support for the Iterator ...

Methods of Collection Interface Iterator Interface in Java Iterators are one of the predefined interfaces that are present in the java.util.*package.

The java.util.SortedSet is a specialization of the Set interface. It represents a set where the elements are sorted. The Set interface does not impose any particular order on its elements.