计算器的设计与实现 设计一个能实现计算器功能的Java程序，可以进行加、减、乘、除（另外可适当加上阶乘、正弦、余弦和指数）运算。-Design and Implementation of the calculator design a Java program that implements a calculator function, you can add, subtract, multiply, and divide (may be appropriate to add anot