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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.jose4j.lang;

public class Maths
{
    //Two's complement -> if the leftmost bit is 0, the number is positive. Otherwise, it's negative.

    public static long add(long x, long y)
    {
        long result = x + y;
        // if both arguments have the opposite sign of the result
        if (0 > ((x ^ result) & (y ^ result)))
        {
            throw new ArithmeticException("long overflow adding: " + x + " + " + y + " = " + result);
        }
        return result;
    }

    public static long subtract(long x, long y)
    {
        long result = x - y;
        // when arguments have different signs and sign of result is different than the sign of x
        if (0 > ((x ^ y) & (x ^ result)))
        {
            throw new ArithmeticException("long overflow subtracting: " + x + " - " + y + " = " + result);
        }
        return result;
    }
}