Use an IO program to create a file with a header and data. For example:-
FileID, Field1Name, Field1Length, Field2Name, Field2Length etc... ie
"1234, Name, 10, Address, 25, Age 3"
Data (obviously field sizes are 10, 25, and 3 (total record length 38)):
"Steven My Address 1 21"
"Fred His Address 2 69"
"Mary Her Address 3 12" etc..
Now can you write a mini-app that can read the header, figure out what data to expect and then read through the data parsing each 38 char record into 3 fields and print them to the screen?
This is how I began my SCJD app. From here its simple to put in a find method, or build a delete, update method but maybe not the best use of your time. If your app can read the file maybe its time to download the exam and get your app to read the file that Sun provide.
Then build the data class over the Sun file to provide the add, update, find functionality.
Would this get you started?