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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.util

Source Cross Reference Class Diagram Java Document (Java Doc)

java.util .TreeSet

TreeSet
public class TreeSet extends AbstractSet implements SortedSet<E>,Cloneable,Serializable(Code)
	TreeSet is an implementation of SortedSet. All optional operations are supported, adding and removing. The elements can be any objects which are comparable to each other either using their natural order or a specified Comparator. since: 1.2

Constructor Summary
public	TreeSet() Constructs a new empty instance of TreeSet which uses natural ordering.
public	TreeSet(Collection<? extends E> collection) Constructs a new instance of TreeSet which uses natural ordering and containing the unique elements in the specified collection.
public	TreeSet(Comparator<? super E> comparator) Constructs a new empty instance of TreeSet which uses the specified Comparator.
public	TreeSet(SortedSet<E> set) Constructs a new instance of TreeSet containing the elements in the specified SortedSet and using the same Comparator.

Method Summary
public boolean	add(E object) Adds the specified object to this TreeSet.
public boolean	addAll(Collection<? extends E> collection) Adds the objects in the specified Collection to this TreeSet.
public void	clear() Removes all elements from this TreeSet, leaving it empty.
public Object	clone() Answers a new TreeSet with the same elements, size and comparator as this TreeSet.
public Comparator<? super E>	comparator() Answers the Comparator used to compare elements in this TreeSet.
public boolean	contains(Object object) Searches this TreeSet for the specified object.
public E	first() Answers the first element in this TreeSet.
public SortedSet<E>	headSet(E end) Answers a SortedSet of the specified portion of this TreeSet which contains elements less than the end element.
public boolean	isEmpty() Answers if this TreeSet has no elements, a size of zero.
public Iterator<E>	iterator() Answers an Iterator on the elements of this TreeSet.
public E	last() Answers the last element in this TreeSet.
public boolean	remove(Object object) Removes an occurrence of the specified object from this TreeSet.
public int	size() Answers the number of elements in this TreeSet.
public SortedSet<E>	subSet(E start, E end) Answers a SortedSet of the specified portion of this TreeSet which contains elements greater or equal to the start element but less than the end element.
public SortedSet<E>	tailSet(E start) Answers a SortedSet of the specified portion of this TreeSet which contains elements greater or equal to the start element.

Constructor Detail

TreeSet
public TreeSet()(Code)
	Constructs a new empty instance of TreeSet which uses natural ordering.

TreeSet
public TreeSet(Collection<? extends E> collection)(Code)
	Constructs a new instance of TreeSet which uses natural ordering and containing the unique elements in the specified collection. Parameters: collection - the collection of elements to add exception: ClassCastException - when an element in the Collection does not implement theComparable interface, or the elements in the Collectioncannot be compared

TreeSet
public TreeSet(Comparator<? super E> comparator)(Code)
	Constructs a new empty instance of TreeSet which uses the specified Comparator. Parameters: comparator - the Comparator

TreeSet
public TreeSet(SortedSet<E> set)(Code)
	Constructs a new instance of TreeSet containing the elements in the specified SortedSet and using the same Comparator. Parameters: set - the SortedSet of elements to add

Method Detail

add
public boolean add(E object)(Code)
	Adds the specified object to this TreeSet. Parameters: object - the object to add true when this TreeSet did not already contain the object, falseotherwise exception: ClassCastException - when the object cannot be compared with the elements inthis TreeSet exception: NullPointerException - when the object is null and the comparator cannot handlenull

addAll
public boolean addAll(Collection<? extends E> collection)(Code)
	Adds the objects in the specified Collection to this TreeSet. Parameters: collection - the Collection of objects true if this TreeSet is modified, false otherwise exception: ClassCastException - when an object in the Collection cannot be compared withthe elements in this TreeSet exception: NullPointerException - when an object in the Collection is null and thecomparator cannot handle null

clear
public void clear()(Code)
	Removes all elements from this TreeSet, leaving it empty. See Also: TreeSet.isEmpty See Also: TreeSet.size

clone
public Object clone()(Code)
	Answers a new TreeSet with the same elements, size and comparator as this TreeSet. a shallow copy of this TreeSet See Also: java.lang.Cloneable

comparator
public Comparator<? super E> comparator()(Code)
	Answers the Comparator used to compare elements in this TreeSet. a Comparator or null if the natural ordering is used

contains
public boolean contains(Object object)(Code)
	Searches this TreeSet for the specified object. Parameters: object - the object to search for true if `object` is an element of this TreeSet,false otherwise exception: ClassCastException - when the object cannot be compared with the elements inthis TreeSet exception: NullPointerException - when the object is null and the comparator cannot handlenull

first
public E first()(Code)
	Answers the first element in this TreeSet. the first element exception: NoSuchElementException - when this TreeSet is empty

headSet
public SortedSet<E> headSet(E end)(Code)
	Answers a SortedSet of the specified portion of this TreeSet which contains elements less than the end element. The returned SortedSet is backed by this TreeSet so changes to one are reflected by the other. Parameters: end - the end element a subset where the elements are less than `end` exception: ClassCastException - when the end object cannot be compared with the elementsin this TreeSet exception: NullPointerException - when the end object is null and the comparator cannothandle null

isEmpty
public boolean isEmpty()(Code)
	Answers if this TreeSet has no elements, a size of zero. true if this TreeSet has no elements, false otherwise See Also: TreeSet.size

iterator
public Iterator<E> iterator()(Code)
	Answers an Iterator on the elements of this TreeSet. an Iterator on the elements of this TreeSet See Also: Iterator

last
public E last()(Code)
	Answers the last element in this TreeSet. the last element exception: NoSuchElementException - when this TreeSet is empty

remove
public boolean remove(Object object)(Code)
	Removes an occurrence of the specified object from this TreeSet. Parameters: object - the object to remove true if this TreeSet is modified, false otherwise exception: ClassCastException - when the object cannot be compared with the elements inthis TreeSet exception: NullPointerException - when the object is null and the comparator cannot handlenull

size
public int size()(Code)
	Answers the number of elements in this TreeSet. the number of elements in this TreeSet

subSet
public SortedSet<E> subSet(E start, E end)(Code)
	Answers a SortedSet of the specified portion of this TreeSet which contains elements greater or equal to the start element but less than the end element. The returned SortedSet is backed by this TreeSet so changes to one are reflected by the other. Parameters: start - the start element Parameters: end - the end element a subset where the elements are greater or equal to`start` and less than `end` exception: ClassCastException - when the start or end object cannot be compared with theelements in this TreeSet exception: NullPointerException - when the start or end object is null and the comparatorcannot handle null

tailSet
public SortedSet<E> tailSet(E start)(Code)
	Answers a SortedSet of the specified portion of this TreeSet which contains elements greater or equal to the start element. The returned SortedSet is backed by this TreeSet so changes to one are reflected by the other. Parameters: start - the start element a subset where the elements are greater or equal to`start` exception: ClassCastException - when the start object cannot be compared with the elementsin this TreeSet exception: NullPointerException - when the start object is null and the comparator cannothandle null

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