how to convert binary to string

[manodrekha]

byte[] bytes = s.getBytes();
  StringBuilder binary = new StringBuilder();
  for (byte b : bytes)
  {
     int val = b;
     for (int j = 0; j < 8; j++)
     {
        binary.append((val & 128) == 0 ? 0 : 1);
        val <<= 1;
     }
     binary.append(' ');
  }

in this pgm I have converted string to binary....from this pgm how can I convert it to back