File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
http://aspose.com/file-tools
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Map

 
Bart Wilson
Greenhorn
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What is exactly a map and how does it work? Does it has something to do with extracting data and matching field names to their values???
 
Bosun Bello
Ranch Hand
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It's well explained in the collections API.
http://developer.java.sun.com/developer/onlineTraining/collections/Collection.html
Bosun
 
It is sorta covered in the JavaRanch Style Guide.
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