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+package ru.ematveev.calculate;%0D%0A%0D%0A%0D%0Apublic class Calculate %7B%0D%0A%0D%0A%09%09private double result;%0D%0A%09%0D%0A%09%09public void add(double first, double second)%7B%0D%0A%0D%0A%09%09this.result = first+second;%0D%0A%09%09%0D%0A%0D%0A%09%7D%0D%0A%0D%0A%09%09public void substruct(double first, double second)%7B%0D%0A%0D%0A%09%09this.result = first-second;%0D%0A%09%09%09%0D%0A%0D%0A%09%7D%0D%0A%0D%0A%09%09public void div(double first, double second)%7B%0D%0A%0D%0A%09%09%0D%0A%09%09this.result = first/second;%0D%0A%09%0D%0A%09%7D%0D%0A%0D%0A%0D%0A%09%09public void multiple(double first, double second)%7B%0D%0A%0D%0A%09%09this.result = first*second;%0D%0A%0D%0A%09%7D%0D%0A%0D%0A%09%09public double getResult()%7B%0D%0A%09%09return this.result;%0D%0A%09%7D%0D%0A%0D%0A%7D

change Calculate.java