### Question:
ByteBufferUtils { public static void moveBufferToStream(OutputStream out, ByteBuffer in, int length) throws IOException { copyBufferToStream(out, in, in.position(), length); skip(in, length); } private  ByteBufferUtils(); static void writeVLong(ByteBuffer out, long i); static long readVLong(ByteBuffer in); static int putCompressedInt(OutputStream out, final int value); static void putInt(OutputStream out, final int value); static void moveBufferToStream(OutputStream out, ByteBuffer in,
      int length); static void copyBufferToStream(OutputStream out, ByteBuffer in,
      int offset, int length); static int putLong(OutputStream out, final long value,
      final int fitInBytes); static int longFitsIn(final long value); static int intFitsIn(final int value); static int readCompressedInt(InputStream input); static int readCompressedInt(ByteBuffer buffer); static long readLong(InputStream in, final int fitInBytes); static long readLong(ByteBuffer in, final int fitInBytes); static void ensureSpace(ByteBuffer out, int length); static void copyFromStreamToBuffer(ByteBuffer out,
      DataInputStream in, int length); static void copyFromBufferToBuffer(ByteBuffer out,
      ByteBuffer in, int sourceOffset, int length); static int findCommonPrefix(ByteBuffer buffer, int offsetLeft,
      int offsetRight, int limit); static int findCommonPrefix(
      byte[] left, int leftOffset, int leftLength,
      byte[] right, int rightOffset, int rightLength); static boolean arePartsEqual(ByteBuffer buffer,
      int offsetLeft, int lengthLeft,
      int offsetRight, int lengthRight); static void skip(ByteBuffer buffer, int length);  }### Answer:
@Test public void testMoveBufferToStream() { final int arrayOffset = 7; final int initialPosition = 10; final int endPadding = 5; byte[] arrayWrapper = new byte[arrayOffset + initialPosition + array.length + endPadding]; System.arraycopy(array, 0, arrayWrapper, arrayOffset + initialPosition, array.length); ByteBuffer buffer = ByteBuffer.wrap(arrayWrapper, arrayOffset, initialPosition + array.length).slice(); assertEquals(initialPosition + array.length, buffer.limit()); assertEquals(0, buffer.position()); buffer.position(initialPosition); ByteArrayOutputStream bos = new ByteArrayOutputStream(); try { ByteBufferUtils.moveBufferToStream(bos, buffer, array.length); } catch (IOException e) { fail("IOException in testCopyToStream()"); } assertArrayEquals(array, bos.toByteArray()); assertEquals(initialPosition + array.length, buffer.position()); }