pl help me I want
Single File Database: Develop a student record management program,
which uses single file as its database. It is not supposed to create
additional files at any part of the project and should never rewrite
total content.

What do you mean: "should never rewrite total content."
And what would be the format of your file. Meaning what would its content be?
What are the rest of your requirements?

See the API docs for and Google RandomAccessFile.

sory..

actually i got like this quesion in one of my interview exams.
i was unable to understand.

I am a java programmer , in search of a Job.
pleas help me in any way..

Then the answer was RandomAccessFile.