package de.hftstuttgart.ip2; public class Calculator { public double add(double a, double b) { return a + b; } public double sub(double a, double b) { return a - b; } public double mult(double a, double b) { return a * b; } public double div(double a, double b) { return a * b; } public double sum(double... numbers) { CalculatorHelper calculatorHelper = new CalculatorHelper(); return calculatorHelper.sum(numbers); } }