How to write partially in file.

You can use RandomAccessFile class and there are methods that you can read/write String. With that you can open the file, read/write/insert anywhere without re-writing the entire file.

Not sure if this would help (Guess it should)

Use RandomAccessFile api and not the normal FileReader/Writer api's.

http://java.sun.com/j2se/1.4.2/docs/api/java/io/RandomAccessFile.html

Sounds like you need Random Access File operations. You have to figure out some way of knowing where exactly in the file you records begin/end. Deleting records would not be possible unless you re-write the entire file (unless the record happens to be the last one in the file, in which case you can truncate it), but you can have a record status field and mark it as deleted. At a later point you can "defrag" the file once to purge all obsolete records as one operation.

http://java.sun.com/docs/books/tutorial/essential/io/rafs.html

This link might be useful.

http://java.sun.com/docs/books/tutorial/essential/io/rafs.html

As my suggestions to ur question u can use GO TO method in Java.lang package and can trace from java.io package which has FileInputStream from this u can read ur file and can edit or delete which ever informartion u want to do without any alteration of ur whole file.

RandomAccessFile is probably your best bet. Useful for large files and for when the records are a known length, so you can seek past them. Not necessarily going to be very efficient code, though.

Thanks for the suggestions - I was also having problems figuring it out as well.

Now if i want to delete any records or edit I have to read the whole file , delete or change the respective record and then write the whole file again in write mode by opening new file with same name.
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With that you can open the file, read/write/insert anywhere without re-writing the entire file.
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