程序主要包括两个类，Calculate和CalculatorFrame。其中Calculate类的功能是进行计算，它利用CalculatorFrame中的数据计算出结果，显示在界面上。CalculatorFrame 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 CalculatorFrame. Calculate the class in which function is calculated, which uses CalculatorFrame data to calculate the results displayed in the interface. CalculatorFrame 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.