How to convert a hexadecimal string to long in java?

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Long.decode(str) accepts a variety of formats:

Accepts decimal, hexadecimal, and octal
numbers given by the following
grammar:
DecodableString:

  • Signopt DecimalNumeral
  • Signopt 0x HexDigits
  • Signopt 0X HexDigits
  • Signopt # HexDigits
  • Signopt 0 OctalDigits

Sign:

  • –

But in your case that won’t help, your String is beyond the scope of what long can hold. You need a BigInteger:

String s = "4d0d08ada45f9dde1e99cad9";
BigInteger bi = new BigInteger(s, 16);
System.out.println(bi);

Output:

23846102773961507302322850521

For Comparison, here’s Long.MAX_VALUE:

9223372036854775807

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