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java data structures

 
Keith Lockey
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I am having trouble deciding how to use java datastructures. For example, I have to pull three fields from a table. The first field has duplicates but it needs to be the key field for the other two fields.
The first field is the name of a database table, and the second and third are the column names of the table, and the data types of the table.
Therefore, I need to make a hashmap that will accept duplicate keys??
Or is there some better way to do this. I wish I had a better handle on when to use certain data structures??
 
William Barnes
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