org.apache.commons.collections4.map

Class HashedMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

org.apache.commons.collections4.map.AbstractHashedMap<K,V>

org.apache.commons.collections4.map.HashedMap<K,V>

Type Parameters:

K - the type of the keys in this map

V - the type of the values in this map

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map<K,V>, Get<K,V>, IterableGet<K,V>, IterableMap<K,V>, Put<K,V>

public class HashedMap<K,V>
extends AbstractHashedMap<K,V>
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:

3.0

See Also:

Serialized Form

Nested Class Summary

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>

Constructor Summary

Constructors

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(java.util.Map<? extends K,? extends V> map) Constructor copying elements from another map.

Method Summary

Modifier and Type	Method and Description
HashedMap<K,V>	clone() Clones the map without cloning the keys or values.

Methods inherited from class org.apache.commons.collections4.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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

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 negative

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 negative

java.lang.IllegalArgumentException - if the load factor is less than zero

HashedMap

public HashedMap(java.util.Map<? extends K,? extends V> 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 HashedMap<K,V> clone()

Clones the map without cloning the keys or values.

Returns:

a shallow clone