用J2ME开发的一个实用软件——计算器。实现了windows系统自带计算器的基本计算功能，界面很舒服，并实现了键盘映射功能。这是我给自己的手机定做的，现在共享给大家。-Using J2ME to develop a practical software- calculator. Realize the windows system comes with the basic calculation calculator function interface is very comfortable, and realize the keyboard mapping function. This is my cell phone to their own custom-made, and now shared with everyone.