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/* |
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* Written by Doug Lea and Josh Bloch with assistance from members of JCP |
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* JSR-166 Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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package java.util; |
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* Subsets of any {@code NavigableSet} must implement the {@code |
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* NavigableSet} interface. |
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* |
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* <p> The return values of navigation methods may be ambiguous in |
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* <p>The return values of navigation methods may be ambiguous in |
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* implementations that permit {@code null} elements. However, even |
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* in this case the result can be disambiguated by checking |
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* {@code contains(null)}. To avoid such issues, implementations of |
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* {@code null} elements. (Note that sorted sets of {@link |
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* Comparable} elements intrinsically do not permit {@code null}.) |
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* |
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* <p>Methods |
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* {@link #subSet(Object, Object) subSet(E, E)}, |
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* {@link #headSet(Object) headSet(E)}, and |
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* {@link #tailSet(Object) tailSet(E)} |
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* are specified to return {@code SortedSet} to allow existing |
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* implementations of {@code SortedSet} to be compatibly retrofitted to |
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* implement {@code NavigableSet}, but extensions and implementations |
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* of this interface are encouraged to override these methods to return |
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* {@code NavigableSet}. |
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* |
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* <p>This interface is a member of the |
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* <a href="{@docRoot}/../guide/collections/index.html"> |
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* <a href="{@docRoot}/../technotes/guides/collections/index.html"> |
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* Java Collections Framework</a>. |
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* |
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* @author Doug Lea |
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Iterator<E> iterator(); |
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/** |
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* Returns a {@link NavigableSet} view of the elements contained in this |
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* set in descending order. The descending set is backed by this set, so |
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* changes to the set are reflected in the descending set, and vice-versa. |
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* If either set is modified while an iteration over the other set is in |
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* progress (except through the iterator's own {@code remove} operation), |
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* the results of the iteration are undefined. |
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* Returns a reverse order view of the elements contained in this set. |
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* The descending set is backed by this set, so changes to the set are |
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* reflected in the descending set, and vice-versa. If either set is |
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* modified while an iteration over either set is in progress (except |
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* through the iterator's own {@code remove} operation), the results of |
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* the iteration are undefined. |
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* |
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* <p>The returned set has an ordering equivalent to |
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* <tt>{@link Collections#reverseOrder(Comparator) Collections.reverseOrder}(comparator())</tt>. |
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* The expression {@code s.descendingSet().descendingSet()} returns a |
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* view of {@code s} essentially equivalent to {@code s}. |
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* |
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* @return a navigable set view of the elements contained in this set, |
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* sorted in descending order |
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* @return a reverse order view of this set |
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*/ |
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NavigableSet<E> descendingSet(); |
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/** |
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* Returns an iterator over the elements in this set, in descending order. |
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* Equivalent in effect to <tt>descendingSet().iterator()</tt>. |
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* Equivalent in effect to {@code descendingSet().iterator()}. |
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* |
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* @return an iterator over the elements in this set, in descending order |
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*/ |
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NavigableSet<E> tailSet(E fromElement, boolean inclusive); |
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/** |
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* Equivalent to {@code subSet(fromElement, true, toElement, false)} |
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* but with a return type conforming to the {@code SortedSet} interface. |
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* {@inheritDoc} |
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* |
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* <p>{@inheritDoc} |
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* <p>Equivalent to {@code subSet(fromElement, true, toElement, false)}. |
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* |
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* @throws ClassCastException {@inheritDoc} |
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* @throws NullPointerException {@inheritDoc} |
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SortedSet<E> subSet(E fromElement, E toElement); |
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/** |
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* Equivalent to {@code headSet(toElement, false)} |
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* but with a return type conforming to the {@code SortedSet} interface. |
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* {@inheritDoc} |
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* |
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* <p>{@inheritDoc} |
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* <p>Equivalent to {@code headSet(toElement, false)}. |
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* |
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* @throws ClassCastException {@inheritDoc} |
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* @throws NullPointerException {@inheritDoc} |
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* @throws IllegalArgumentException {@inheritDoc} |
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*/ |
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na */ |
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SortedSet<E> headSet(E toElement); |
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/** |
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* Equivalent to {@code tailSet(fromElement, true)} |
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* but with a return type conforming to the {@code SortedSet} interface. |
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* {@inheritDoc} |
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* |
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* <p>{@inheritDoc} |
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* <p>Equivalent to {@code tailSet(fromElement, true)}. |
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* |
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* @throws ClassCastException {@inheritDoc} |
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* @throws NullPointerException {@inheritDoc} |
