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java.lang.Objectjava.util.AbstractMap
org.apache.commons.collections.map.AbstractHashedMap
org.apache.commons.collections.map.HashedMap
public class HashedMap
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.
| 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 |
|---|
public HashedMap()
public HashedMap(int initialCapacity)
initialCapacity - the initial capacity
java.lang.IllegalArgumentException - if the initial capacity is less than one
public HashedMap(int initialCapacity,
float loadFactor)
initialCapacity - the initial capacityloadFactor - the load factor
java.lang.IllegalArgumentException - if the initial capacity is less than one
java.lang.IllegalArgumentException - if the load factor is less than zeropublic HashedMap(java.util.Map map)
map - the map to copy
java.lang.NullPointerException - if the map is null| Method Detail |
|---|
public java.lang.Object clone()
clone in class AbstractHashedMap
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