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There will be a lot of first times as you learn java.

Try writing a small simple program for testing different techniques for reading a file, updating its contents and writing it out again for...

When updating a file, you need to replace the whole of the current contents with the new contents. You do NOT want to append the new contents to the file's old contents.

Whatever method is used to read the data from the file, it should save ALL the data in a list in the program.
The list can be updated and then the data can be written back to the file, replacing the...

For such small files, read the whole file into a list of some kind, update the records in the list and then write the contents of the updated list back to the file when the updates are done.

What changes need to be made to the file for a student to deregister?
If data is to be removed from the file, the contents of the file will have to be changed by rewriting the file.
If there are no...