Description: Design GUII interface calculator program, the user can enter the input value through the mouse, adding, subtraction, multiplication, division and other operations.
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File list (Check if you may need any files):
chap2\chap2
chap2\chap2\ComputerPad.java
chap2\chap2\NumberButton.java
chap2\chap2\OperationButton.java
chap2