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See this thread and this one for details.
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Java Collections

Jon Camilleri
Ranch Hand

Joined: Apr 25, 2008
Posts: 660

When should I use a HashMap or a TreeMap, and, when should I use a HashSet, or a DeQue?
What are the practical applications suggested for the Collections?


Jon
Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14114
    
  16

A Map, a Set and a Deque are very different data structures. Do you understand the difference between them? The API documentation of those classes also contains detailed information about them.


Java Beginners FAQ - JavaRanch SCJP FAQ - The Java Tutorial - Java SE 7 API documentation
Scala Notes - My blog about Scala
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38449
    
  23
. . . or the Java™ Tutorials.
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Java Collections