- All Known Subinterfaces:
- All Known Implementing Classes:
- public interface Iterator
An iterator over a collection. Iterator takes the place of Enumeration in
the Java collections framework. Iterators differ from enumerations in two
- Iterators allow the caller to remove elements from the
underlying collection during the iteration with well-defined
- Method names have been improved.
- See Also:
Returns true if the iteration has more elements.
Returns the next element in the interation.
Removes from the underlying collection the last element returned by the
iterator (optional operation).
public boolean hasNext()
- Returns true if the iteration has more elements. (In other
words, returns true if next would return an element
rather than throwing an exception.)
- true if the iterator has more elements.
public Object next()
- Returns the next element in the interation.
- NoSuchElementException - iteration has no more elements.
public void remove()
- 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.
- UnsupportedOperationException - if the remove
operation is not supported by this Iterator.
- IllegalStateException - if the next method has not
yet been called, or the remove method has already
been called after the last call to the next
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