import java.io.File;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class Main {
public static void main(String[] argv) throws Exception {
ByteBuffer bbuf = ByteBuffer.allocate(100);
File file = new File("filename");
boolean append = false;
FileChannel wChannel = new FileOutputStream(file, append).getChannel();
wChannel.write(bbuf);
wChannel.close();
}
}