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void readData() {
  int bufferSize = 16 * 1024;
  byte zeroes = new byte[bufferSize];
  ByteBuffer buffer = ByteBuffer.allocateDirect(bufferSize);
  try (FileChannel rdr = (new FileInputStream("file")).getChannel()) {
   	while (rdr.read(buffer) > 0) {

      // Do something with the buffer

	  buffer.clear();
      buffer.put(zeroes); // overwrite buffer with zeroes
	  buffer.clear();
	}
  } catch (Throwable e) {
    // Handle error
  }
}