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| java.util.NavigableSet<E> |
 Known Indirect Subclasses
ConcurrentSkipListSet<E>,
TreeSet<E>
|
A SortedSet extended with navigation methods reporting
closest matches for given search targets. Methods lower,
floor, ceiling, and higher return elements
respectively less than, less than or equal, greater than or equal,
and greater than a given element, returning null if there
is no such element. A NavigableSet may be accessed and
traversed in either ascending or descending order. The descendingSet method returns a view of the set with the senses of
all relational and directional methods inverted. The performance of
ascending operations and views is likely to be faster than that of
descending ones. This interface additionally defines methods
pollFirst and pollLast that return and remove the
lowest and highest element, if one exists, else returning null. Methods subSet, headSet,
and tailSet differ from the like-named SortedSet methods in accepting additional arguments describing
whether lower and upper bounds are inclusive versus exclusive.
Subsets of any NavigableSet must implement the NavigableSet interface.
The return values of navigation methods may be ambiguous in
implementations that permit null elements. However, even
in this case the result can be disambiguated by checking
contains(null). To avoid such issues, implementations of
this interface are encouraged to not permit insertion of
null elements. (Note that sorted sets of Comparable elements intrinsically do not permit null.)
Methods
subSet(E, E),
headSet(E), and
tailSet(E)
are specified to return SortedSet to allow existing
implementations of SortedSet to be compatibly retrofitted to
implement NavigableSet, but extensions and implementations
of this interface are encouraged to override these methods to return
NavigableSet.
| Public Methods | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Returns the least element in this set greater than or equal to
the given element, or
null if there is no such element.
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Returns an iterator over the elements in this set, in descending order.
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Returns a reverse order view of the elements contained in this set.
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Returns the greatest element in this set less than or equal to
the given element, or
null if there is no such element.
| |||||||||||
Returns a
SortedSet of the specified portion of this
SortedSet which contains elements less than the end element.
Equivalent to | |||||||||||
Returns a view of the portion of this set whose elements are less than
(or equal to, if
inclusive is true) toElement.
| |||||||||||
Returns the least element in this set strictly greater than the
given element, or
null if there is no such element.
| |||||||||||
Returns an iterator over the elements in this set, in ascending order.
| |||||||||||
Returns the greatest element in this set strictly less than the
given element, or
null if there is no such element.
| |||||||||||
Retrieves and removes the first (lowest) element,
or returns
null if this set is empty.
| |||||||||||
Retrieves and removes the last (highest) element,
or returns
null if this set is empty.
| |||||||||||
Returns a
SortedSet of the specified portion of this
SortedSet which contains elements greater or equal to the start
element but less than the end element.
Equivalent to | |||||||||||
Returns a view of the portion of this set whose elements range from
fromElement to toElement.
| |||||||||||
Returns a view of the portion of this set whose elements are greater
than (or equal to, if
inclusive is true) fromElement.
| |||||||||||
Returns a
SortedSet of the specified portion of this
SortedSet which contains elements greater or equal to the start
element.
Equivalent to | |||||||||||
|
[Expand]
Inherited Methods | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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From interface
java.lang.Iterable
| |||||||||||
|
From interface
java.util.Collection
| |||||||||||
|
From interface
java.util.Set
| |||||||||||
|
From interface
java.util.SortedSet
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Returns the least element in this set greater than or equal to
the given element, or null if there is no such element.
| e | the value to match |
|---|
e,
or null if there is no such element| ClassCastException | if the specified element cannot be compared with the elements currently in the set |
|---|---|
| NullPointerException | if the specified element is null and this set does not permit null elements |
Returns an iterator over the elements in this set, in descending order.
Equivalent in effect to descendingSet().iterator().
Returns a reverse order view of the elements contained in this set.
The descending set is backed by this set, so changes to the set are
reflected in the descending set, and vice-versa. If either set is
modified while an iteration over either set is in progress (except
through the iterator's own remove operation), the results of
the iteration are undefined.
The returned set has an ordering equivalent to
Collections.reverseOrder(comparator()).
The expression s.descendingSet().descendingSet() returns a
view of s essentially equivalent to s.
Returns the greatest element in this set less than or equal to
the given element, or null if there is no such element.
| e | the value to match |
|---|
e,
or null if there is no such element| ClassCastException | if the specified element cannot be compared with the elements currently in the set |
|---|---|
| NullPointerException | if the specified element is null and this set does not permit null elements |
Returns a SortedSet of the specified portion of this
SortedSet which contains elements less than the end element. The
returned SortedSet is backed by this SortedSet so changes
to one set are reflected by the other.
Equivalent to headSet(toElement, false).
| toElement | the end element. |
|---|
end.Returns a view of the portion of this set whose elements are less than
(or equal to, if inclusive is true) toElement. The
returned set is backed by this set, so changes in the returned set are
reflected in this set, and vice-versa. The returned set supports all
optional set operations that this set supports.
The returned set will throw an IllegalArgumentException
on an attempt to insert an element outside its range.
| toElement | high endpoint of the returned set |
|---|---|
| inclusive | true if the high endpoint
is to be included in the returned view |
inclusive is true) toElement| ClassCastException | if toElement is not compatible
with this set's comparator (or, if the set has no comparator,
if toElement does not implement Comparable).
Implementations may, but are not required to, throw this
exception if toElement cannot be compared to elements
currently in the set. |
|---|---|
| NullPointerException | if toElement is null and
this set does not permit null elements |
| IllegalArgumentException | if this set itself has a
restricted range, and toElement lies outside the
bounds of the range
|
Returns the least element in this set strictly greater than the
given element, or null if there is no such element.
| e | the value to match |
|---|
e,
or null if there is no such element| ClassCastException | if the specified element cannot be compared with the elements currently in the set |
|---|---|
| NullPointerException | if the specified element is null and this set does not permit null elements |
Returns an iterator over the elements in this set, in ascending order.
Returns the greatest element in this set strictly less than the
given element, or null if there is no such element.
| e | the value to match |
|---|
e,
or null if there is no such element| ClassCastException | if the specified element cannot be compared with the elements currently in the set |
|---|---|
| NullPointerException | if the specified element is null and this set does not permit null elements |
Retrieves and removes the first (lowest) element,
or returns null if this set is empty.
null if this set is empty
Retrieves and removes the last (highest) element,
or returns null if this set is empty.
null if this set is empty
Returns a SortedSet of the specified portion of this
SortedSet which contains elements greater or equal to the start
element but less than the end element. The returned SortedSet is
backed by this SortedMap so changes to one set are reflected by the
other.
Equivalent to subSet(fromElement, true, toElement, false).
| fromElement | the start element. |
|---|---|
| toElement | the end element. |
start
and less than end.Returns a view of the portion of this set whose elements range from
fromElement to toElement. If fromElement and
toElement are equal, the returned set is empty unless fromExclusive and toExclusive are both true. The returned set
is backed by this set, so changes in the returned set are reflected in
this set, and vice-versa. The returned set supports all optional set
operations that this set supports.
The returned set will throw an IllegalArgumentException
on an attempt to insert an element outside its range.
| fromElement | low endpoint of the returned set |
|---|---|
| fromInclusive | true if the low endpoint
is to be included in the returned view |
| toElement | high endpoint of the returned set |
| toInclusive | true if the high endpoint
is to be included in the returned view |
fromElement, inclusive, to toElement, exclusive| ClassCastException | if fromElement and
toElement cannot be compared to one another using this
set's comparator (or, if the set has no comparator, using
natural ordering). Implementations may, but are not required
to, throw this exception if fromElement or
toElement cannot be compared to elements currently in
the set. |
|---|---|
| NullPointerException | if fromElement or
toElement is null and this set does
not permit null elements |
| IllegalArgumentException | if fromElement is
greater than toElement; or if this set itself
has a restricted range, and fromElement or
toElement lies outside the bounds of the range.
|
Returns a view of the portion of this set whose elements are greater
than (or equal to, if inclusive is true) fromElement.
The returned set is backed by this set, so changes in the returned set
are reflected in this set, and vice-versa. The returned set supports
all optional set operations that this set supports.
The returned set will throw an IllegalArgumentException
on an attempt to insert an element outside its range.
| fromElement | low endpoint of the returned set |
|---|---|
| inclusive | true if the low endpoint
is to be included in the returned view |
fromElement| ClassCastException | if fromElement is not compatible
with this set's comparator (or, if the set has no comparator,
if fromElement does not implement Comparable).
Implementations may, but are not required to, throw this
exception if fromElement cannot be compared to elements
currently in the set. |
|---|---|
| NullPointerException | if fromElement is null
and this set does not permit null elements |
| IllegalArgumentException | if this set itself has a
restricted range, and fromElement lies outside the
bounds of the range
|
Returns a SortedSet of the specified portion of this
SortedSet which contains elements greater or equal to the start
element. The returned SortedSet is backed by this
SortedSet so changes to one set are reflected by the other.
Equivalent to tailSet(fromElement, true).
| fromElement | the start element. |
|---|
start .