This compressed file contains three simple calculator code, can be compared to study, in which the third through the detailed notes I hope to you a little enlightenment java beginners.

Calculator
..........\.classpath
..........\.project
..........\bin
..........\...\com
..........\...\...\Calculator1
..........\...\...\...........\Calculator1.class
..........\...\...\...........\CalculatorGUI$myWindowListener.class
..........\...\...\...........\CalculatorGUI$setLabelText_ActionListener.class
..........\...\...\...........\CalculatorGUI$setOperator_ActionListener.class
..........\...\...\...........\CalculatorGUI.class
..........\...\...\Calculator2
..........\...\...\...........\Calculator2$1.class
..........\...\...\...........\Calculator2$MouseListenerC.class
..........\...\...\...........\Calculator2$MouseListenerO.class
..........\...\...\...........\Calculator2.class
..........\...\...\Calculator3
..........\...\...\...........\Calculator3.class
..........\src
..........\...\com
..........\...\...\Calculator1
..........\...\...\...........\Calculator1.java
..........\...\...\...........\CalculatorGUI.java
..........\...\...\Calculator2
..........\...\...\...........\Calculator2.java
..........\...\...\Calculator3
..........\...\...\...........\Calculator3.java

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