java采用面向对象编程方法实现一个简单的计算器，完成两个整数的加、减、乘、除运算。参与运算的两个整数及运算符从命令行参数传入。-Java programming method by using object oriented implement a simple calculator, finish two integer of add, subtract, multiply and divide operations. Participate in the operation two integer and operators from the command line parameters into.