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 ...

Filtering Iterator nuts and bolts As the filtering Iterator implements the java.util.Iterator interface, it must provide implementations for the methods defined within that interface.

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