文件名称:jisuanqi
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设计一个计算器，利用它可以进行简单的四则运算（加、减、乘、除、开方）等，但仅限于十进制下，此外还可以进行（八进制，十进制，十六进制）之间的相互转换。
要求：有简单的需求分析，功能设计，详细设计（程序流程），异常处理，测试，源程序清单，总结，具体格式见附件。
知识点：
掌握 图形用户界面设计；
掌握基本类的设计与使用；
掌握事件处理机制；
掌握使用异常处理方法。
-Design a calculator, which allows you a simple four operations (addition, subtraction, multiplication, prescribing), but only to the decimal, in addition can also be (octal, decimal, hexadecimal) conversion. Requirements: a simple needs analysis, functional design, detailed design (program flow), exception handling, testing, source list, summary, the specific format in Annex. Point of knowledge: to master the design of graphical user interface master the basic design and use of the class master event handling mechanism to master the use of exception handling.
要求：有简单的需求分析，功能设计，详细设计（程序流程），异常处理，测试，源程序清单，总结，具体格式见附件。
知识点：
掌握 图形用户界面设计；
掌握基本类的设计与使用；
掌握事件处理机制；
掌握使用异常处理方法。
-Design a calculator, which allows you a simple four operations (addition, subtraction, multiplication, prescribing), but only to the decimal, in addition can also be (octal, decimal, hexadecimal) conversion. Requirements: a simple needs analysis, functional design, detailed design (program flow), exception handling, testing, source list, summary, the specific format in Annex. Point of knowledge: to master the design of graphical user interface master the basic design and use of the class master event handling mechanism to master the use of exception handling.
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计算器
......\Counters.java
......\Counters.java