An iterator over a collection. Iterator takes the place of Enumeration in
the Java collections framework. Iterators differ from enumerations in two
ways:
- Iterators allow the caller to remove elements from the
underlying collection during the iteration with well-defined
semantics.
- Method names have been improved.
This interface is a member of the
Java Collections Framework.
Returns true if the iteration has more elements. (In other
words, returns true if next would return an element
rather than throwing an exception.)
Returns the next element in the iteration. Calling this method
repeatedly until the
method returns false will
return each element in the underlying collection exactly once.
Removes from the underlying collection the last element returned by the
iterator (optional operation). This method can be called only once per
call to next. The behavior of an iterator is unspecified if
the underlying collection is modified while the iteration is in
progress in any way other than by calling this method.