org.mozilla.javascript

Class Hashtable

java.lang.Object

org.mozilla.javascript.Hashtable

All Implemented Interfaces:

java.io.Serializable, java.lang.Iterable<Hashtable.Entry>

public class Hashtable
extends java.lang.Object
implements java.io.Serializable, java.lang.Iterable<Hashtable.Entry>

This generic hash table class is used by Set and Map. It uses a standard HashMap for storing keys and values so that we can handle lots of hash collisions if necessary, and a doubly-linked list to support the iterator capability.

This second one is important because JavaScript handling of the iterator is completely different from the way that Java does it. In Java an attempt to modify a collection on a HashMap or LinkedHashMap while iterating through it (except by using the "remove" method on the Iterator object itself) results in a ConcurrentModificationException. JavaScript Maps and Sets explicitly allow the collection to be modified, or even cleared completely, while iterators exist, and even lets an iterator keep on iterating on a collection that was empty when it was created..

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Hashtable.Entry One entry in the hash table.

Constructor Summary

Constructors

Constructor and Description
Hashtable()

Method Summary

Modifier and Type	Method and Description
void	clear()
java.lang.Object	delete(java.lang.Object key)
java.lang.Object	get(java.lang.Object key)
boolean	has(java.lang.Object key)
java.util.Iterator<Hashtable.Entry>	iterator()
void	put(java.lang.Object key, java.lang.Object value)
int	size()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

Hashtable

public Hashtable()

Method Detail

size

public int size()

put

public void put(java.lang.Object key,
                java.lang.Object value)

get

public java.lang.Object get(java.lang.Object key)

has

public boolean has(java.lang.Object key)

delete

public java.lang.Object delete(java.lang.Object key)

clear

public void clear()

iterator

public java.util.Iterator<Hashtable.Entry> iterator()

Specified by:

iterator in interface java.lang.Iterable<Hashtable.Entry>