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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 .Set

Set
public interface Set extends Collection<E>(Code)
	Set is a collection which does not allow duplicate elements. since: 1.2

Method Summary
public boolean	add(E object) Adds the specified object to this Set.
public boolean	addAll(Collection<? extends E> collection) Adds the objects in the specified Collection which do not exist in this Set.
public void	clear() Removes all elements from this Set, leaving it empty.
public boolean	contains(Object object) Searches this Set for the specified object.
public boolean	containsAll(Collection collection) Searches this Set for all objects in the specified Collection.
public boolean	equals(Object object) Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison. Parameters: object - Object the object to compare with this object.
public int	hashCode() Answers an integer hash code for the receiver.
public boolean	isEmpty() Answers if this Set has no elements, a size of zero.
public Iterator<E>	iterator() Answers an Iterator on the elements of this Set.
public boolean	remove(Object object) Removes any occurrence of the specified object from this Set.
public boolean	removeAll(Collection collection) Removes all objects in the specified Collection from this Set.
public boolean	retainAll(Collection collection) Removes all objects from this Set that are not contained in the specified Collection.
public int	size() Answers the number of elements in this Set.
public Object[]	toArray() Answers an array containing all elements contained in this Set.
public T[]	toArray(T[] array) Answers an array containing all elements contained in this Set.

Method Detail

add
public boolean add(E object)(Code)
	Adds the specified object to this Set. The Set is not modified if it already contains the object. Parameters: object - the object to add true if this Set is modified, false otherwise exception: UnsupportedOperationException - when adding to this Set is not supported exception: ClassCastException - when the class of the object is inappropriate for this Set exception: IllegalArgumentException - when the object cannot be added to this Set

addAll
public boolean addAll(Collection<? extends E> collection)(Code)
	Adds the objects in the specified Collection which do not exist in this Set. Parameters: collection - the Collection of objects true if this Set is modified, false otherwise exception: UnsupportedOperationException - when adding to this Set is not supported exception: ClassCastException - when the class of an object is inappropriate for this Set exception: IllegalArgumentException - when an object cannot be added to this Set

clear
public void clear()(Code)
	Removes all elements from this Set, leaving it empty. exception: UnsupportedOperationException - when removing from this Set is not supported See Also: Set.isEmpty See Also: Set.size

contains
public boolean contains(Object object)(Code)
	Searches this Set for the specified object. Parameters: object - the object to search for true if object is an element of this Set, false otherwise

containsAll
public boolean containsAll(Collection collection)(Code)
	Searches this Set for all objects in the specified Collection. Parameters: collection - the Collection of objects true if all objects in the specified Collection are elements ofthis Set, false otherwise

equals
public boolean equals(Object object)(Code)
	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison. Parameters: object - Object the object to compare with this object. boolean `true` if the object is the same as thisobject `false` if it is different from this object. See Also: Set.hashCode

hashCode
public int hashCode()(Code)
	Answers an integer hash code for the receiver. Objects which are equal answer the same value for this method. the receiver's hash See Also: Set.equals

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

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

remove
public boolean remove(Object object)(Code)
	Removes any occurrence of the specified object from this Set. Parameters: object - the object to remove true if this Set is modified, false otherwise exception: UnsupportedOperationException - when removing from this Set is not supported

removeAll
public boolean removeAll(Collection collection)(Code)
	Removes all objects in the specified Collection from this Set. Parameters: collection - the Collection of objects to remove true if this Set is modified, false otherwise exception: UnsupportedOperationException - when removing from this Set is not supported

retainAll
public boolean retainAll(Collection collection)(Code)
	Removes all objects from this Set that are not contained in the specified Collection. Parameters: collection - the Collection of objects to retain true if this Set is modified, false otherwise exception: UnsupportedOperationException - when removing from this Set is not supported

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

toArray
public Object[] toArray()(Code)
	Answers an array containing all elements contained in this Set. an array of the elements from this Set

toArray
public T[] toArray(T[] array)(Code)
	Answers an array containing all elements contained in this Set. If the specified array is large enough to hold the elements, the specified array is used, otherwise an array of the same type is created. If the specified array is used and is larger than this Set, the array element following the collection elements is set to null. Parameters: array - the array an array of the elements from this Set exception: ArrayStoreException - when the type of an element in this Set cannot be storedin the type of the specified array

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