Module org.hsqldb

Package org.hsqldb.lib

Class HashSet<E>

java.lang.Object

org.hsqldb.map.BaseHashMap

org.hsqldb.lib.HashSet<E>

All Implemented Interfaces:

Collection<E>, Set<E>

Direct Known Subclasses:

OrderedHashSet

public class HashSet<E>
extends org.hsqldb.map.BaseHashMap
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 inherited from class org.hsqldb.map.BaseHashMap

ACCESS_MAX, 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()
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
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
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 org.hsqldb.map.BaseHashMap

clear, clone, isEmpty, size

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.hsqldb.lib.Collection

clear, isEmpty, size

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