Hexadecimal to Integer in Java

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Why do you not use the java functionality for that:

If your numbers are small (smaller than yours) you could use: Integer.parseInt(hex, 16) to convert a Hex – String into an integer.

  String hex = "ff"
  int value = Integer.parseInt(hex, 16);

For big numbers like yours, use public BigInteger(String val, int radix) 

  BigInteger value = new BigInteger(hex, 16);

@See JavaDoc:

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