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 classes/interfaces inherited from class java.util.AbstractMap |
java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V> |
Nested classes/interfaces inherited from interface java.util.Map |
java.util.Map.Entry<K,V> |
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 |
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 capacityloadFactor
- 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
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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