Class HashSet<E>

java.lang.Object

org.hsqldb.lib.HashSet<E>

All Implemented Interfaces:

Collection<E>, Set<E>

Direct Known Subclasses:

OrderedHashSet

public class HashSet<E>
extends Object
implements Set<E>

This class does not store null keys.

Since:

1.7.2

Author:

Fred Toussi (fredt@users dot sourceforge.net)

Field Summary

Fields

Modifier and Type	Field	Description
static final int	ACCESS_MAX
static final Object[]	emptyObjectArray

Constructor Summary

Constructors

Constructor	Description
HashSet()
HashSet(int initialCapacity)
HashSet(int initialCapacity, ObjectComparator<E> comparator)
HashSet(E[] valueList)

Method Summary

Modifier and Type	Method	Description
boolean	add(E key)	returns true if element is added
boolean	addAll(E[] keys)	returns true if any element is added
boolean	addAll(E[] keys, int start, int limit)	returns true if any added
boolean	addAll(Collection<? extends E> c)	returns true if any element is added
int	capacity()
void	clear()	Clear the map completely.
org.hsqldb.map.BaseHashMap	clone()
boolean	contains(Object key)
boolean	containsAll(Collection<E> col)
E	get(E key)
int	getCommonElementCount(Set<E> other)
E	getOrAdd(E key)	returns existing value or null if added can be used as an Object cache
boolean	isEmpty()
Iterator<E>	iterator()
boolean	remove(E key)	returns true if removed
boolean	removeAll(E[] keys)	returns true if all were removed
boolean	removeAll(Collection<E> c)	returns true if all were removed
int	size()
Object[]	toArray()
<T> T[]	toArray(T[] a)
String	toString()	Returns a String like "[Drei, zwei, Eins]", exactly like java.util.HashSet.

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface Collection

clear, isEmpty, size

Field Details

ACCESS_MAX

public static final int ACCESS_MAX

See Also:

• Constant Field Values

emptyObjectArray

public static final Object[] emptyObjectArray

Constructor Details

HashSet

public HashSet()

HashSet

public HashSet(int initialCapacity)
        throws IllegalArgumentException

Throws:

IllegalArgumentException

HashSet

public HashSet(int initialCapacity,
 ObjectComparator<E> comparator)
        throws IllegalArgumentException

Throws:

IllegalArgumentException

HashSet

public HashSet(E[] valueList)

Method Details

contains

public boolean contains(Object key)

Specified by:

contains in interface Collection<E>

containsAll

public boolean containsAll(Collection<E> col)

getOrAdd

public E getOrAdd(E key)

returns existing value or null if added can be used as an Object cache

get

public E get(E key)

add

public boolean add(E key)

returns true if element is added

Specified by:

add in interface Collection<E>

Parameters:

key - the element

Returns:

true if added

addAll

public boolean addAll(Collection<? extends E> c)

returns true if any element is added

Specified by:

addAll in interface Collection<E>

Parameters:

c - the Collection to add

Returns:

true if any element is added

addAll

public boolean addAll(E[] keys)

returns true if any element is added

Parameters:

keys - the array of elements to add

Returns:

true if any element is added

addAll

public boolean addAll(E[] keys,
 int start,
 int limit)

returns true if any added

Parameters:

keys - array of keys to add

start - first index to add

limit - limit of index to add

Returns:

true if any element was added

remove

public boolean remove(E key)

returns true if removed

Specified by:

remove in interface Collection<E>

Parameters:

key - Object to remove

Returns:

true if removed

removeAll

public boolean removeAll(Collection<E> c)

returns true if all were removed

Parameters:

c - Collection of elements to remove

Returns:

true if all removed

removeAll

public boolean removeAll(E[] keys)

returns true if all were removed

Parameters:

keys - E[]

Returns:

boolean

capacity

public int capacity()

getCommonElementCount

public int getCommonElementCount(Set<E> other)

toArray

public <T> T[] toArray(T[] a)

toArray

public Object[] toArray()

iterator

public Iterator<E> iterator()

Specified by:

iterator in interface Collection<E>

toString

public String toString()

Returns a String like "[Drei, zwei, Eins]", exactly like java.util.HashSet.

Overrides:

toString in class Object

Returns:

String representation

clear

public void clear()

Clear the map completely.

size

public int size()

isEmpty

public boolean isEmpty()

clone

public org.hsqldb.map.BaseHashMap clone()