计算器样板（简单的计算器），使用JAVA语言实现，十分好的示例-calculator model (simple calculators), the use of Java language, a very good example

简单计算器设计，实现了计算器的大部分功能，是采用JAVA编写的。大家帮忙看一下。谢谢！ -simple calculator design and achieved most of the calculator functions, is prepared by using Java. We look at the help. Thank you!