简易计算器

本项目需要实现一个简单的四则运算的计算器，拥有加、减、乘、除功能。该程序是一个图形界面的Java计算器,其界面主要采用了awt包，程序目标为：

（1）按下数字键在液晶平上会显示数字，这时计算器最基本的功能；

（2）实现除了加、减、乘、除按钮外其他按钮功能；

（3）按下清除“C”键，数据被全部清除；

（4）按下退格“退格”键，数据可被倒退。

-The project needs to achieve a simple arithmetic calculator has added, subtract, multiply, and in addition to functionality. The program is a graphical interface Java calculator interface awt package program objectives:

(1) Press the number keys on the LCD flat display digital, when the basic calculator function

(2) achieve the addition, subtraction, multiplication, and button function button outside

(3) Press to clear the "C" key, the data is all cleared

(4) Press the Backspace Backspace "key, the data can be retrogression.