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+import java.util.Scanner;%0A%0Apublic class DumbCalculator %7B%0A%0A    public static void main(String%5B%5D args) %7B%0A%0A        Scanner keyboard = new Scanner(System.in);%0A%0A        System.out.print(%22What is your first number?%22);%0A        double first = keyboard.nextDouble();%0A%0A        System.out.print(%22What is your second number?%22);%0A        double second = keyboard.nextDouble();%0A%0A        System.out.print(%22What is your third number?%22);%0A        double third = keyboard.nextDouble();%0A%0A%0A        System.out.print(%22( %22+first+%22 + %22+second+%22 + %22+third+%22 ) / 2 is... %22+calc(first, second, third));%0A    %7D%0A%0A    public static double calc (double x, double y, double z)%7B%0A        double answer = (x+y+z)/2;%0A%0A        return answer;%0A    %7D%0A%7D%0A

Create DumbCalculator.java