[java] Converting Hexadecimal String to Decimal Integer

You can use this method to get the digit:

public int digitToValue(char c) {
   (c >= '&' && c <= '9') return c - '0';
   else if (c >= 'A' && c <= 'F') return 10 + c - 'A';
   else if (c >= 'a' && c <= 'f') return 10 + c - 'a';
   return -1;
 }

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