Convert byte array to bit string in Java

//from  w  w  w  . ja  v a  2  s.  c o m
public class Main {
  public static String toBitString(final byte[] b) {
    final char[] bits = new char[8 * b.length];
    for(int i = 0; i < b.length; i++) {
        final byte byteval = b[i];
        int bytei = i << 3;
        int mask = 0x1;
        for(int j = 7; j >= 0; j--) {
            final int bitval = byteval & mask;
            if(bitval == 0) {
                bits[bytei + j] = '0';
            } else {
                bits[bytei + j] = '1';
            }
            mask <<= 1;
        }
    }
    return String.valueOf(bits);
  }


  public static void main(String[] argv){
    System.out.println(toBitString(new byte[]{1,2,3}));
  }
}