weiss.util
Class HashSet

java.lang.Object
  |
  +--weiss.util.AbstractCollection
        |
        +--weiss.util.HashSet

All Implemented Interfaces:

Collection, java.io.Serializable, Set

public class HashSet

extends AbstractCollection

implements Set

HashSet implementation. Matches are based on equals; and hashCode must be consistently defined.

See Also:

Serialized Form

Constructor Summary

HashSet()
Construct an empty HashSet.

HashSet(Collection other)
Construct a HashSet from any collection.

Method Summary

boolean	add(java.lang.Object x) Adds an item to this collection.
void	clear() Change the size of this collection to zero.
boolean	contains(java.lang.Object x) Tests if some item is in this collection.
java.lang.Object	getMatch(java.lang.Object x) This method is not part of standard Java 1.2.
Iterator	iterator() Obtains an Iterator object used to traverse the collection.
boolean	remove(java.lang.Object x) Removes an item from this collection.
int	size() Returns the number of items in this collection.

Methods inherited from class weiss.util.AbstractCollection

equals, hashCode, isEmpty, toArray

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface weiss.util.Collection

isEmpty, toArray

Constructor Detail

HashSet

public HashSet()

Construct an empty HashSet.

HashSet

public HashSet(Collection other)

Construct a HashSet from any collection.

Method Detail

size

public int size()

Returns the number of items in this collection.

Specified by:

size in interface Collection

Returns:

the number of items in this collection.

getMatch

public java.lang.Object getMatch(java.lang.Object x)

This method is not part of standard Java 1.2. Like contains, it checks if x is in the set. If it is, it returns the reference to the matching object; otherwise it returns null.

Specified by:

getMatch in interface Set

Parameters:

x - the object to search for.

Returns:

if contains(x) is false, the return value is null; otherwise, the return value is the object that causes contains(x) to return true.

contains

public boolean contains(java.lang.Object x)

Tests if some item is in this collection.

Specified by:

contains in interface Collection

Overrides:

contains in class AbstractCollection

Parameters:

x - any object.

Returns:

true if this collection contains an item equal to x.

add

public boolean add(java.lang.Object x)

Adds an item to this collection.

Specified by:

add in interface Collection

Parameters:

x - any object.

Returns:

true if this item was added to the collection.

remove

public boolean remove(java.lang.Object x)

Removes an item from this collection.

Specified by:

remove in interface Collection

Overrides:

remove in class AbstractCollection

Parameters:

x - any object.

Returns:

true if this item was removed from the collection.

clear

public void clear()

Change the size of this collection to zero.

Specified by:

clear in interface Collection

Overrides:

clear in class AbstractCollection

iterator

public Iterator iterator()

Obtains an Iterator object used to traverse the collection.

Specified by:

iterator in interface Collection