程序主要包括两个类，Calculate和Calculatorfr a me。其中Calculate类的功能是进行计算，它利用Calculatorfr a me中的数据计算出结果，显示在界面上。Calculatorfr a me 是初始化界面，以及响应用户的操作。另外还有一个是测试类Calculator类用于启动计算器。-Procedures will include two classes, Calculate and Calculatorfr a me. Calculate the class in which function is calculated, which uses Calculatorfr a me data to calculate the results displayed in the interface. Calculatorfr a me is the initialization interface, as well as respond to user actions. Another one is to test the class Calculator class is used to start the calculator.