K
- the type of the keys in this mapV
- the type of the values in this mappublic class HashedMap<K,V> extends AbstractHashedMap<K,V> 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 Collections.synchronizedMap(Map)
. This class may throw
exceptions when accessed by concurrent threads without synchronization.
AbstractHashedMap.EntrySet<K,V>, AbstractHashedMap.EntrySetIterator<K,V>, AbstractHashedMap.HashEntry<K,V>, AbstractHashedMap.HashIterator<K,V>, AbstractHashedMap.HashMapIterator<K,V>, AbstractHashedMap.KeySet<K>, AbstractHashedMap.KeySetIterator<K>, AbstractHashedMap.Values<V>, AbstractHashedMap.ValuesIterator<V>
AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>
DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR, DEFAULT_THRESHOLD, GETKEY_INVALID, GETVALUE_INVALID, MAXIMUM_CAPACITY, NO_NEXT_ENTRY, NO_PREVIOUS_ENTRY, NULL, REMOVE_INVALID, SETVALUE_INVALID
Constructor and Description |
---|
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<? extends K,? extends V> map)
Constructor copying elements from another map.
|
Modifier and Type | Method and Description |
---|---|
HashedMap<K,V> |
clone()
Clones the map without cloning the keys or values.
|
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
finalize, getClass, notify, notifyAll, wait, wait, wait
compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll
public HashedMap()
public HashedMap(int initialCapacity)
initialCapacity
- the initial capacityIllegalArgumentException
- if the initial capacity is negativepublic HashedMap(int initialCapacity, float loadFactor)
initialCapacity
- the initial capacityloadFactor
- the load factorIllegalArgumentException
- if the initial capacity is negativeIllegalArgumentException
- if the load factor is less than zeropublic HashedMap(Map<? extends K,? extends V> map)
map
- the map to copyNullPointerException
- if the map is nullCopyright © 2001–2019 The Apache Software Foundation. All rights reserved.