math.java

public final class Math {
    private Math() {}

    public static int add(int firstNumber, int secondNumber) {
        return firstNumber + secondNumber;
    }

    public static int multiply(int multiplicand, int multiplier) {
        return multiplicand * multiplier;
    }

    public static double divide(int dividend, int divisor) {
        if (divisor == 0)
            throw new IllegalArgumentException("Cannot divide by zero (0).");

        return dividend / divisor;
    }
}