What is the Map interface

The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys withvalues.

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Aug 26th, 2004
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Prabhas270
Profile Answers by Prabhas270

Jul 5th, 2008

Hi There,

Map is one of the datastuctures provided by Sun.Map is an interface ,it is not extending from Collection interface as like List,Set,Queue does.

There are 4 Classes which are implemented the Map interface.

      HashMap
      HashTable
      LinkedHashMap
      TreeMap

And SortedMap is an interface extending from Map.Todo Sorting TreeMap implemented SortedMap Interface.

Coming to HashMap,We can store and maintain the data in the format of Key/Value pairs .And HashMap allows null as key and value.But HashTable not allows.

As useval LinkedHashMap is to maintain te data in the format of insertion order.But it is little bit slow compare with HashMap.Iteration will be faster.