org.apache.commons.collections.map

Class HashedMap

Implemented Interfaces:
Cloneable, Map, Serializable, IterableMap

public class HashedMap
extends AbstractHashedMap
implements Serializable, Cloneable

A Map implementation that is a general purpose alternative to HashMap.

This implementation improves on the JDK1.4 HashMap by adding the MapIterator functionality and many methods for subclassing.

Version:
$Revision: 1.15 $ $Date: 2004/02/18 01:13:19 $
Author:
Stephen Colebourne
Since:
Commons Collections 3.0

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.collections.map.AbstractHashedMap

AbstractHashedMap.EntrySet, AbstractHashedMap.EntrySetIterator, AbstractHashedMap.HashEntry, AbstractHashedMap.HashIterator, AbstractHashedMap.HashMapIterator, AbstractHashedMap.KeySet, AbstractHashedMap.KeySetIterator, AbstractHashedMap.Values, AbstractHashedMap.ValuesIterator

Field Summary

Fields inherited from class org.apache.commons.collections.map.AbstractHashedMap

DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_THRESHOLD, GETKEY_INVALID, GETVALUE_INVALID, MAXIMUM_CAPACITY, NO_NEXT_ENTRY, NO_PREVIOUS_ENTRY, NULL, REMOVE_INVALID, SETVALUE_INVALID, data, entrySet, keySet, loadFactor, modCount, size, threshold, values

Constructor Summary

HashedMap()
Constructs a new empty map with default size and load factor.
HashedMap(Map map)
Constructor copying elements from another map.
HashedMap(int initialCapacity)
Constructs a new, empty map with the specified initial capacity.
HashedMap(int initialCapacity, float loadFactor)
Constructs a new, empty map with the specified initial capacity and load factor.

Method Summary

Object
clone()
Clones the map without cloning the keys or values.

Methods inherited from class org.apache.commons.collections.map.AbstractHashedMap

addEntry, addMapping, calculateNewCapacity, calculateThreshold, checkCapacity, clear, clone, containsKey, containsValue, convertKey, createEntry, createEntrySetIterator, createKeySetIterator, createValuesIterator, destroyEntry, doReadObject, doWriteObject, ensureCapacity, entryHashCode, entryKey, entryNext, entrySet, entryValue, equals, get, getEntry, hash, hashCode, hashIndex, init, isEmpty, isEqualKey, isEqualValue, keySet, mapIterator, put, putAll, remove, removeEntry, removeMapping, reuseEntry, size, toString, updateEntry, values

Constructor Details

HashedMap

public HashedMap()
Constructs a new empty map with default size and load factor.

HashedMap

public HashedMap(Map map)
Constructor copying elements from another map.
Parameters:
map - the map to copy

HashedMap

public HashedMap(int initialCapacity)
Constructs a new, empty map with the specified initial capacity.
Parameters:
initialCapacity - the initial capacity

HashedMap

public HashedMap(int initialCapacity,
                 float loadFactor)
Constructs a new, empty map with the specified initial capacity and load factor.
Parameters:
initialCapacity - the initial capacity
loadFactor - the load factor

Method Details

clone

public Object clone()
Clones the map without cloning the keys or values.
Overrides:
clone in interface AbstractHashedMap
Returns:
a shallow clone

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