java based math libarary to handle multiple math scenarios

Question

We are planning to do something similar to what is available in this site AAAMath. We would like to generate sample questions which will add / mult / div / sub (either 2 numbers or 3 numbers or one of the numbers could be a constant ..). Would like to know if there are any libraries which provide a higher level abstraction on the above basic math operations (e.g. provide a single method which is capable of handling addition of either 2 values, 3 values or a [randomized range of inputs] + a constant value which gives you a set of answers).

Answer 1

Not sure what you are getting at here but java 5 and higher have variadic methods which make this easy to do yourself, e.g.

public static int add(int ...addends)
{
    long sum = 0;
    for(int addend : addends)
    {
        sum += addend;
    }
    if (sum > Integer.MAX_VALUE || sum < Integer.MIN_VALUE)
    {
        throw new RuntimeException("summation has over- or underflowed");
    }
    return (int) sum;
}

public static void main(String[] args)
{
    System.out.println("sum is: " + add(10, 11, 1029102, -10));
}

Answer 2

I like the abstractions provided by JScience; but if you need to evaluate arithmetic expressions, this example may serve as a guide.