How to put incremental change in a file to the disk??

Hi,
I am having my own simple file editor. Now even if I make a small change in a file and want to save those changes I have to write the whole content again.
I mean it's similar like writing a fresh file.
Is there a way through which I should write only the incremental changes to the file rather than writing the whole thing .
Imp: can anyone provide me some good link or material related to NIO for better understanding.
Thanks,
Param.

If the file contains lines* that are all the same length (which can be accomplished by padding each line with the appropriate number of spaces) then you can use an indexed access method, as described by the RandomAccessFile API here:
http://java.sun.com/javase/6/docs/api/java/io/RandomAccessFile.html
* You can have all of the data - that is, the entire file - in a single line, if you want; it's not necessary to create multiple lines. In this case you would use a read method after positioning, rather than a readline method.

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How to put incremental change in a file to the disk??

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