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JavaTM 2 Platform Std. Ed. v1.3.1 |
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java.util
Interface Iterator
- All Known Subinterfaces:
- ListIterator
- All Known Implementing Classes:
- BeanContextSupport.BCSIterator
- 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 ways:
- Iterators allow the caller to remove elements from the underlying collection during the iteration with well-defined semantics.
- Method names have been improved.
- Since:
- 1.2
- See Also:
Collection,ListIterator,Enumeration
| Method Summary | |
boolean |
hasNext()
Returns true if the iteration has more elements. |
Object |
next()
Returns the next element in the interation. |
void |
remove()
Removes from the underlying collection the last element returned by the iterator (optional operation). |
| Method Detail |
hasNext
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.)
- Returns:
- true if the iterator has more elements.
next
public Object next()
- Returns the next element in the interation.
- Returns:
- the next element in the iteration.
- Throws:
NoSuchElementException- iteration has no more elements.
remove
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.
- Throws:
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 method.
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JavaTM 2 Platform Std. Ed. v1.3.1 |
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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