org.apache.commons.collections.map
public class HashedMap extends AbstractHashedMap implements Serializable, Cloneable
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 java.util.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) $
| 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(Map map)
Constructor copying elements from another map.
| |
| Method Summary | |
|---|---|
| Object | clone()
Clones the map without cloning the keys or values.
|
Parameters: initialCapacity the initial capacity
Throws: IllegalArgumentException if the initial capacity is less than one
Parameters: initialCapacity the initial capacity loadFactor the load factor
Throws: IllegalArgumentException if the initial capacity is less than one IllegalArgumentException if the load factor is less than zero
Parameters: map the map to copy
Throws: NullPointerException if the map is null
Returns: a shallow clone