A simple calculator program Supports four arithmetic reference for beginners to learn

JN_Calculator
.............\.classpath
.............\.project
.............\.settings
.............\.........\org.eclipse.jdt.core.prefs
.............\bin
.............\...\jn
.............\...\..\basic
.............\...\..\.....\panel
.............\...\..\.....\.....\BasicNumJPanel.class
.............\...\..\.....\.....\BasicOperator.class
.............\...\..\.....\.....\SpeicficButton.class
.............\...\..\button
.............\...\..\......\listener
.............\...\..\......\........\BackspaceButtonListener.class
.............\...\..\......\........\ButtonShortcutKey.class
.............\...\..\......\........\CleanButtonListener.class
.............\...\..\......\........\EqualButtonListener.class
.............\...\..\......\........\GridButtonListener.class
.............\...\..\......\........\ListenerFactory.class
.............\...\..\......\........\minusButtonListener.class
.............\...\..\......\........\NumButtonListener.class
.............\...\..\......\........\OperatorButtonListener.class
.............\...\..\count
.............\...\..\.....\JudgeInputWithCount.class
.............\...\..\display
.............\...\..\.......\DisplayPanel.class
.............\...\..\main
.............\...\..\....\frame
.............\...\..\....\.....\BasicInterfaceFrame.class
.............\...\..\....\.....\MainControler.class
.............\...\..\....\.....\TestAction.class
.............\src
.............\...\jn
.............\...\..\basic
.............\...\..\.....\panel
.............\...\..\.....\.....\BasicNumJPanel.java
.............\...\..\.....\.....\BasicOperator.java
.............\...\..\.....\.....\SpeicficButton.java
.............\...\..\button
.............\...\..\......\listener
.............\...\..\......\........\BackspaceButtonListener.java
.............\...\..\......\........\ButtonShortcutKey.java
.............\...\..\......\........\CleanButtonListener.java
.............\...\..\......\........\EqualButtonListener.java
.............\...\..\......\........\GridButtonListener.java
.............\...\..\......\........\ListenerFactory.java
.............\...\..\......\........\minusButtonListener.java
.............\...\..\......\........\NumButtonListener.java
.............\...\..\......\........\OperatorButtonListener.java
.............\...\..\count
.............\...\..\.....\JudgeInputWithCount.java
.............\...\..\display
.............\...\..\.......\DisplayPanel.java
.............\...\..\main
.............\...\..\....\frame
.............\...\..\....\.....\BasicInterfaceFrame.java
.............\...\..\....\.....\MainControler.java
.............\...\..\....\.....\TestAction.java

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