Java Glossary : HashMap

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HashMap

A HashMap lets you look up values by exact key (always case-sensitive). It is very much like a Hashtable, except that it is faster and not thread-safe. There are some minor other differences:

HashMaps work with Iterators where the older Hashtables work with Enumerations
Hashtables work best with capacities that are prime numbers. HashMaps round capacities up to powers of two.

JavaDoc on HashMap : available:

on the web at java.Sun.com
on J: in the JDK 1.4.2_04: J:\j2sdk1.4.2_04\docs\api\java\util\HashMap.html
on J: in the JDK 1.5 beta: J:\Program Files\Java\j2sdk1.5.0\docs\api\java\util\HashMap.html

Hashtable ¤ soft reference ¤ weak reference

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