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I don't have any idea what the assignment means by buffers. As I said, I have not used the nio package classes. This assignment sounds like it wants you to use the classes in that package.

Most I/O done on computers uses buffers. That is a given.
I have not used the nio package classes and can not advise on what they offer. I'm sure that they will have a lot of useful features.

Is this an exercise to use classes from the nio package?
You keep saying 'buffer' meaning specific classes. I use buffer in a more generic sense, like you can use a byte array for a buffer.

Please explain what you mean by "buffer code".
Can you explain your problem at a higher level?
For example: you have a file to read and you need to separate that file's contents to several...

Your professor must have given you some background and notes towards designing a program to solve this problem.
There must be rules given for figuring out what is in the buffered input records
and...