Can I reverse the filechannel with certain bytes overpassed

Question

In my programming, I do not know how many bytes I need to read for a certain object util I processed it. But I know at most it is 1024 bytes.

After processing the object, how can I put the remaining bytes back to the file i.e., revserse the fc by the number of remaning number of bytes.

I mean could I let the filechannel go back by a certain number of bytes, say 4 bytes from current position? –

By read an object do you mean to say your using a `ObjectInputStream`? — ug_, Apr 14 '14 at 21:28
I used a filechannel and bytebuffer then use the bytebuffer to write into a bytearray — user3495562, Apr 14 '14 at 21:33
I mean could I rewind the filechannel by a certain number of bytes, say 4 bytes from current position? — user3495562, Apr 14 '14 at 21:36

score 0 · Answer 1 · answered Apr 14 '14 at 21:48

0

Using FileChannels you can get and set the position very easily.

FileChannel channel = ...
// rewind 4 bytes
channel .position(channel .position()-4);

answered Apr 14 '14 at 21:48

ug_

1 Answers1