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## org.apache.commons.collections.map
Class HashedMap

    java.lang.Object
      java.util.AbstractMap
          org.apache.commons.collections.map.AbstractHashedMap
              org.apache.commons.collections.map.HashedMap

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, java.util.Map, IterableMap

    public class HashedMap

extends AbstractHashedMap
implements java.io.Serializable, java.lang.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.

Note that HashedMap is not synchronized and is not thread-safe. If you wish to use this map from multiple threads concurrently, you must use appropriate synchronization. The simplest approach is to wrap this map using `Collections.synchronizedMap(Map)`. This class may throw exceptions when accessed by concurrent threads without synchronization.

Since:
  Commons Collections 3.0
Version:
  $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
Author:
  Stephen Colebourne
See Also:
  Serialized Form

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`

Nested classes/interfaces inherited from interface java.util.Map
`java.util.Map.Entry`

Field Summary

Fields inherited from class org.apache.commons.collections.map.AbstractHashedMap
`data, DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_THRESHOLD, entrySet, GETKEY_INVALID, GETVALUE_INVALID, keySet, loadFactor, MAXIMUM_CAPACITY, modCount, NO_NEXT_ENTRY, NO_PREVIOUS_ENTRY, NULL, REMOVE_INVALID, SETVALUE_INVALID, size, threshold, values`

Constructor Summary
`HashedMap()` Constructs a new empty map with default size and load factor.
`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.
`HashedMap(java.util.Map map)` Constructor copying elements from another map.

Method Summary
`java.lang.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, 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`

Methods inherited from class java.lang.Object
`finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### HashedMap

    public HashedMap()

  Constructs a new empty map with default size and load factor.

### HashedMap

    public HashedMap(int initialCapacity)

  Constructs a new, empty map with the specified initial capacity.

  Parameters:
    `initialCapacity` - the initial capacity
  Throws:
    `java.lang.IllegalArgumentException` - if the initial capacity is less than one

### 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
  Throws:
    `java.lang.IllegalArgumentException` - if the initial capacity is less than one
    `java.lang.IllegalArgumentException` - if the load factor is less than zero

### HashedMap

    public HashedMap(java.util.Map map)

  Constructor copying elements from another map.

  Parameters:
    `map` - the map to copy
  Throws:
    `java.lang.NullPointerException` - if the map is null

Method Detail

### clone

    public java.lang.Object clone()

  Clones the map without cloning the keys or values.

  Overrides:
    `clone` in class `AbstractHashedMap`
  Returns:
    a shallow clone

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Copyright © 2001-2008 The Apache Software Foundation. All Rights Reserved.