Description: Create an application ChangeBallColor that displays a panel. This panel will contain two buttons (one for red and one for blue). It will also display a filled in circle. When the user clicks on a button, the circle should change to that color. So, if a user clicks the blue button, the circle will change to blue. Similarly, if a user clicks the red button, the circle will turn to red.
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实验九\.classpath
......\.project
......\.settings\org.eclipse.jdt.core.prefs
......\bin\AddCircles$1.class
......\...\AddCircles.class
......\...\ButtonJpanel.class
......\...\MainFrame.class
......\...\PictureComponent$MouseHandler.class
......\...\PictureComponent$MouseMotionHandler.class
......\...\PictureComponent.class
......\src\AddCircles.java
......\.settings
......\bin
......\src
实验九
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