Maps

By Octavio Berlanga, on June 3rd, 2010.
HashMap

LinkedHashMap

  • A Map that guarantees the iterator will match the order in which items were added to the map or the order in which they were last accessed.
    • WeakHashMap

  • Items will be processed by the Garbage Collector if there are no other references to those objects–apart from the WeakHashMap.
  • Internally, it references objects through java.lang.ref.WeakReference.
    • IdentityHashMap

  • Two references are considered equal if they point to the same object, rather than by evauating equality through the equals method
    • EnumMap

    TreeMap

  • Implements NavigableMap, which extends SortedMap.
    • ConcurrentHashMap

  • Implements ConcurrentMap interface.
    • ConcurrentSkipListMap

  • Implements ConcurrentNavigableMap interface.
    • Map Selection

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