```
 public static byte[] hexStringToByte(String paramString)
    {
        int j = paramString.length();
        byte[] arrayOfByte = new byte[j / 2];
        int i = 0;
        while (i < j)
        {
            arrayOfByte[(i / 2)] = ((byte)((Character.digit(paramString.charAt(i), 16) << 4) + Character.digit(paramString.charAt(i + 1), 16)));
            i += 2;
        }
        return arrayOfByte;
    }

     public static String bytesToHexString(ArrayList<Byte> paramArrayList) {
        StringBuilder localStringBuilder = new StringBuilder("");
        if ((paramArrayList == null) || (paramArrayList.size() <= 0)) {
            return null;
        }
        int i = 0;
        while (i < paramArrayList.size()) {
            String str = Integer.toHexString((Byte) paramArrayList.get(i) & 0xFF);
            if (str.length() < 2) {
                localStringBuilder.append(0);
            }
            localStringBuilder.append(str);
            i += 1;
        }
        return localStringBuilder.toString();
    }

    public static String bytesToHexString(byte[] paramArrayOfByte) {
        StringBuilder localStringBuilder = new StringBuilder("");
        if ((paramArrayOfByte == null) || (paramArrayOfByte.length <= 0)) {
            return null;
        }
        int i = 0;
        while (i < paramArrayOfByte.length) {
            String str = Integer.toHexString(paramArrayOfByte[i] & 0xFF);
            if (str.length() < 2) {
                localStringBuilder.append(0);
            }
            localStringBuilder.append(str);
            i += 1;
        }
        return localStringBuilder.toString();
    }
```