import java.io.File;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
public class Main {
public static void main(String[] argv) throws Exception {
// Create a read/writeable file channel
File file = new File("filename");
FileChannel channel = new RandomAccessFile(file, "rw").getChannel();
OutputStream os = Channels.newOutputStream(channel);
os.close();
}
}