Parses the string argument as an unsigned long in the radix specified by the second argument. An unsigned integer maps the values usually associated with negative numbers to positive numbers larger than MAX_VALUE. The characters in the string must all be digits of the specified radix (as determined by whether java.lang.Character.digit(char, int) returns a nonnegative value), except that the first character may be an ASCII plus sign '+' ( '\u002B'). The resulting integer value is returned.

An exception of type NumberFormatException is thrown if any of the following situations occurs:

The first argument is null or is a string of length zero.
The radix is either smaller than java.lang.Character.MIN_RADIX or larger than java.lang.Character.MAX_RADIX.
Any character of the string is not a digit of the specified radix, except that the first character may be a plus sign '+' ( '\u002B') provided that the string is longer than length 1.
The value represented by the string is larger than the largest unsigned long, 2⁶⁴-1.

Parameters:

s the String containing the unsigned integer representation to be parsed

radix the radix to be used while parsing s.

Returns: the unsigned long represented by the string argument in the specified radix.

Exceptions:

NumberFormatException if the String does not contain a parsable long.

Since: 1.8

`s`		the `String` containing the unsigned integer representation to be parsed
`radix`		the radix to be used while parsing `s`.