Package org.apache.commons.collections4.multimap

Class ArrayListValuedHashMap<K,V>

java.lang.Object
org.apache.commons.collections4.multimap.AbstractMultiValuedMap<K,V>
org.apache.commons.collections4.multimap.AbstractListValuedMap<K,V>
org.apache.commons.collections4.multimap.ArrayListValuedHashMap<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:
Serializable, ListValuedMap<K,V>, MultiValuedMap<K,V>
public class ArrayListValuedHashMap<K,V> extends AbstractListValuedMap<K,V> implements Serializable
Implements a ListValuedMap, using a HashMap to provide data storage and ArrayLists as value collections. This is the standard implementation of a ListValuedMap.

Note that ArrayListValuedHashMap is not synchronized and is not thread-safe. If you wish to use this map from multiple threads concurrently, you must use appropriate synchronization. This class may throw exceptions when accessed by concurrent threads without synchronization.

Since:
4.1
See Also:

  • Field Details

    • serialVersionUID

      private static final long serialVersionUID
      Serialization Version
      See Also:

    • DEFAULT_INITIAL_MAP_CAPACITY

      private static final int DEFAULT_INITIAL_MAP_CAPACITY
      The initial map capacity used when none specified in constructor.
      See Also:

    • DEFAULT_INITIAL_LIST_CAPACITY

      private static final int DEFAULT_INITIAL_LIST_CAPACITY
      The initial list capacity when using none specified in constructor.
      See Also:

    • initialListCapacity

      private final int initialListCapacity
      The initial list capacity when creating a new value collection.

  • Constructor Details

    • ArrayListValuedHashMap

      public ArrayListValuedHashMap()
      Creates an empty ArrayListValuedHashMap with the default initial map capacity (16) and the default initial list capacity (3).

    • ArrayListValuedHashMap

      public ArrayListValuedHashMap(int initialListCapacity)
      Creates an empty ArrayListValuedHashMap with the default initial map capacity (16) and the specified initial list capacity.
      Parameters:
      initialListCapacity - the initial capacity used for value collections

    • ArrayListValuedHashMap

      public ArrayListValuedHashMap(int initialMapCapacity, int initialListCapacity)
      Creates an empty ArrayListValuedHashMap with the specified initial map and list capacities.
      Parameters:
      initialMapCapacity - the initial hashmap capacity
      initialListCapacity - the initial capacity used for value collections

    • ArrayListValuedHashMap

      public ArrayListValuedHashMap(MultiValuedMap<? extends K,? extends V> map)
      Creates an ArrayListValuedHashMap copying all the mappings of the given map.
      Parameters:
      map - a MultiValuedMap to copy into this map

    • ArrayListValuedHashMap

      public ArrayListValuedHashMap(Map<? extends K,? extends V> map)
      Creates an ArrayListValuedHashMap copying all the mappings of the given map.
      Parameters:
      map - a Map to copy into this map

  • Method Details