Class OrderedHashSet<T>

java.lang.Object

java.util.AbstractCollection<T>

java.util.AbstractSet<T>

java.util.HashSet<T>

java.util.LinkedHashSet<T>

org.antlr.misc.OrderedHashSet<T>

All Implemented Interfaces:

Serializable, Cloneable, Iterable<T>, Collection<T>, SequencedCollection<T>, SequencedSet<T>, Set<T>

public class OrderedHashSet<T>
extends LinkedHashSet<T>

A HashMap that remembers the order that the elements were added. You can alter the ith element with set(i,value) too :) Unique list. I need the replace/set-element-i functionality so I'm subclassing OrderedHashSet.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected List<T>	elements	Track the elements as they are added to the set

Constructor Summary

Constructors

Constructor	Description
OrderedHashSet()

Method Summary

Modifier and Type	Method	Description
boolean	add(T value)	Add a value to list; keep in hashtable for consistency also; Key is object itself.
void	clear()
List<T>	elements()	Return the List holding list of table elements.
T	get(int i)
Iterator<T>	iterator()
boolean	remove(Object o)
T	set(int i, T value)	Replace an existing value with a new value; updates the element list and the hash table, but not the key as that has not changed.
int	size()
Object[]	toArray()
String	toString()

Methods inherited from class LinkedHashSet

addFirst, addLast, getFirst, getLast, newLinkedHashSet, removeFirst, removeLast, reversed, spliterator

Methods inherited from class HashSet

clone, contains, isEmpty, newHashSet, toArray

Methods inherited from class AbstractSet

equals, hashCode, removeAll

Methods inherited from class AbstractCollection

addAll, containsAll, retainAll

Methods inherited from class Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface Iterable

forEach

Methods inherited from interface Set

addAll, contains, containsAll, equals, hashCode, isEmpty, removeAll, retainAll, toArray

Field Details

elements

protected List<T> elements

Track the elements as they are added to the set

Constructor Details

OrderedHashSet

public OrderedHashSet()

Method Details

get

public T get(int i)

set

public T set(int i,
 T value)

Replace an existing value with a new value; updates the element list and the hash table, but not the key as that has not changed.

add

public boolean add(T value)

Add a value to list; keep in hashtable for consistency also; Key is object itself. Good for say asking if a certain string is in a list of strings.

Specified by:

add in interface Collection<T>

Specified by:

add in interface Set<T>

Overrides:

add in class HashSet<T>

remove

public boolean remove(Object o)

Specified by:

remove in interface Collection<T>

Specified by:

remove in interface Set<T>

Overrides:

remove in class HashSet<T>

clear

public void clear()

Specified by:

clear in interface Collection<T>

Specified by:

clear in interface Set<T>

Overrides:

clear in class HashSet<T>

elements

public List<T> elements()

Return the List holding list of table elements. Note that you are NOT getting a copy so don't write to the list.

iterator

public Iterator<T> iterator()

Specified by:

iterator in interface Collection<T>

Specified by:

iterator in interface Iterable<T>

Specified by:

iterator in interface Set<T>

Overrides:

iterator in class HashSet<T>

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<T>

Specified by:

toArray in interface Set<T>

Overrides:

toArray in class HashSet<T>

size

public int size()

Specified by:

size in interface Collection<T>

Specified by:

size in interface Set<T>

Overrides:

size in class HashSet<T>

toString

public String toString()

Overrides:

toString in class AbstractCollection<T>