Java NIO with ByteBuffer

Question

Hi guys,
I search the forum and the web too, there are many pros and cons in relation to NIO, and on my free time I was trying to research about it, but there
are time when some things don't make any sense at all.
Without NIO:
    FileInputStream foin = new FileInputStream("/home/metitus/Desktop/test");
    FileOutputStream fout = new FileOutputStream("/home/metitus/Desktop/test1");
    int character = 0;
    while((character = foin.read()) != -1)
        fout.write(character);
    }with NIO:
FileInputStream foin = new FileInputStream("/home/metitus/Desktop/test");
    FileOutputStream fout = new FileOutputStream("/home/metitus/Desktop/test1");
    FileChannel fci = foin.getChannel();
    FileChannel fco = fout.getChannel();
    ByteBuffer buffer = ByteBuffer.allocate(1);
    while(fci.read(buffer) != -1)
        buffer.flip();
        fout.write(buffer.array());
        buffer.clear();
    }So guys where is the gain here? Why do I need a ByteBuffer always; it might be useful in some cases but definitely not in all.
MeTitus

Answer 1

Well there should be more than one position. You're doing it the slowest way possible. There should be 8192, or 16384, or some large number. And when you raise the size you have to use compact(): buffer.clear() is valid if and only if the buffer size is 1; buffer.compact() is valid for all buffer sizes.
In fact the loop should look like this to take care of the last write:
while ((count = in.read(buffer)) >= 0 || buffer.position() > 0)
  buffer.flip();
  out.write(buffer);
  buffer.compact();
}