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.lang.Cloneable, IterableMap, java.util.Map, java.io.Serializable

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.

Since:

Commons Collections 3.0

Version:

$Revision: 1.15 $ $Date: 2004/02/18 01:13:19 $

Author:

Stephen Colebourne

See Also:

Serialized Form

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

clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, mapIterator, put, putAll, remove, size, toString, values

Methods inherited from class java.lang.Object

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