How can I convert byte array into hex string in Java

Question

I have a byte array. I want to convert it into hex strings. How to perform this conversion?

Answer 1

private final static char[] hexarr = "0123456789ABCDEF".toCharArray();
public static String bytesToHex(byte[] bytes) {
    char[] hexchars = new char[bytes.length * 2];
    for ( int j = 0; j < bytes.length; j++ ) {
        int v = bytes[j] & 0xFF;
        hexchars[j * 2] = hexarr[v >>> 4];
        hexchars[j * 2 + 1] = hexarr[v & 0x0F];
    }
    return new String(hexchars);
}

Answer 2

public static String byteArrayToHex(byte[] a) {
   StringBuilder sb = new StringBuilder(a.length * 2);
   for(byte b: a)
      sb.append(String.format("%02x", b));
   return sb.toString();
}