Calculator

class Calculator
{
    double calculate(double x,double y,String function)
    {
        double calculation;
        if (function == "sum") {
            calculation = x + y;
        }
        else if (function == "multi") {
            calculation = x * y;
        }
        else if (function == "divade") {
            calculation = x / y;
        }
        else if (function == "subtract") {
            calculation = x - y;
        }
        else
        {
            calculation = 422;
            System.out.println("error 422 - u made a type-o");
        }
        return calculation;
    }
}