Indexing a set of key pair values for use in J2ME Application

I have some 1000 key-pair values that I will use in my j2me application, reading it from a resource file. However I will be using only a few of those values at any time, say 10, based on the record number being generated inside the application logic. Loading all the values int开发者_如何学Co memory and then looking up is fairly not an efficient option as I will not be using all the records. Is there a better scheme to store the values in the file, some indexing or something so that I can retrieve those key-pair values by skipping the amount of bytes in the file to reach and read the appropriate record? As this is a resource file in the jar there wont be any modifications to it.

If you know the record length when they are created, you could write the records out in binary format to a file. But at the start of each record, you could first write a number indicating its size in bytes and use a RandomAccessFile to access the records by moving the file pointer. But in terms of speed, loading into memory will be faster than reading from a file, but if memory is at a premium, then a file wouldn't be a bad way to go.

Jeff

Skipping bytes in a compressed resource file inside a jar is not really going to be optimal either and the implementation of InputStream you get as a result of calling Class.getResourceAsInputStream() may be fragmented if you plan on running your application on several devices.

EDIT after additional info in comment:

It could be that the best way to do this is actually to store the (question, answer) data in 1000 different classes.

It's going to feel very weird as a solution but the class loader should only load the 10 classes you actually use, you can generate the 1000 source files with a simple J2SE program and you can load 10 random classes based on an integer inside their name using java.lang.Class.forName().

If the jar file doesn't become too big to use, you're basically relying on the indexing of its zip file format for the class loader performances...