public void print(PrintStream out, String prefix)
    {
        print(out, prefix, data, data.length);
    }
@Test
    public void testPrint()
    {
        byte[] buf = new byte[10];
        Arrays.fill(buf, (byte) 0xAA);
        ZData data = new ZData(buf);

        data.print(System.out, "ZData: ");
    }