URGENT- Using Indexed files

Hi,
How do i create indexed files in java. I would like to do 2 things:
1) I would like to read a particular line in the file. Say i just want to read the 100th line in the file
2) The records in this file are of constant length. I would also like to specify the first n characters of each record as the key and would like to specify the key and read just that record from the file.
How do i do this.
Any sample code would be of great help
Thanks and regards,
Vijay

I assume you are not trying to create a commercial grade application, because what you are trying to do is basically the functionality that all databases provide out of box, in a transactional environment in an efficient manner. It is a rather complex feat.
So I assume it is a homework assignment.
What you can do is to store the index key in a Hashtable and the value being the record #. This you can serialize and store in a separate index file. May be you can look into one of the Tree structures which would be faster than a Hashtable.
So if you look up the key from the hashtable, you will know it's record # and hence where to find it in the file. Now you can use RandomAccessFile to access the record quickly.
I don't have any sample code, else I'd have provided it to you.

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