Using java language to achieve the calculator function

Calculator\.classpath
Calculator\.project
Calculator\.settings\org.eclipse.jdt.core.prefs
Calculator\bin\com\oracle\csg\calculator\about\21.jpg
Calculator\bin\com\oracle\csg\calculator\about\A3.jpg
Calculator\bin\com\oracle\csg\calculator\about\About$1.class
Calculator\bin\com\oracle\csg\calculator\about\About$TimerEv.class
Calculator\bin\com\oracle\csg\calculator\about\About.class
Calculator\bin\com\oracle\csg\calculator\about\MyBorder$Dong.class
Calculator\bin\com\oracle\csg\calculator\about\MyBorder$MouseE.class
Calculator\bin\com\oracle\csg\calculator\about\MyBorder.class
Calculator\bin\com\oracle\csg\calculator\about\MyDongcLabel.class
Calculator\bin\com\oracle\csg\calculator\about\MyPicLabel.class
Calculator\bin\com\oracle\csg\calculator\about\Oracle.png
Calculator\bin\com\oracle\csg\calculator\about\top.jpg
Calculator\bin\com\oracle\csg\calculator\main\CalculateButton.class
Calculator\bin\com\oracle\csg\calculator\main\Calculator$ButtonListener.class
Calculator\bin\com\oracle\csg\calculator\main\Calculator.class
Calculator\src\com\oracle\csg\calculator\about\21.jpg
Calculator\src\com\oracle\csg\calculator\about\A3.jpg
Calculator\src\com\oracle\csg\calculator\about\About.java
Calculator\src\com\oracle\csg\calculator\about\MyBorder.java
Calculator\src\com\oracle\csg\calculator\about\MyDongcLabel.java
Calculator\src\com\oracle\csg\calculator\about\MyPicLabel.java
Calculator\src\com\oracle\csg\calculator\about\Oracle.png
Calculator\src\com\oracle\csg\calculator\about\top.jpg
Calculator\src\com\oracle\csg\calculator\main\CalculateButton.java
Calculator\src\com\oracle\csg\calculator\main\Calculator.java
Calculator\bin\com\oracle\csg\calculator\about
Calculator\bin\com\oracle\csg\calculator\main
Calculator\src\com\oracle\csg\calculator\about
Calculator\src\com\oracle\csg\calculator\main
Calculator\bin\com\oracle\csg\calculator
Calculator\src\com\oracle\csg\calculator
Calculator\bin\com\oracle\csg
Calculator\src\com\oracle\csg
Calculator\bin\com\oracle
Calculator\src\com\oracle
Calculator\bin\com
Calculator\src\com
Calculator\.settings
Calculator\bin
Calculator\src
Calculator

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