14. 11. 5. Listening to JCheckBox Events with an ItemListener

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import javax.swing.JCheckBox;import javax.swing.JFrame;import javax.swing.AbstractButton;import java.awt.Color;import java.awt.event.ItemEvent;import java.awt.event.ItemListener;public class JCheckBoxItemListener {    public static void main(String[] args){    JFrame frame = new JFrame("JCheckBox-ItemListener");    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    JCheckBox aCheckBox = new JCheckBox("草包");        ItemListener itemListener = new ItemListener(){    public void itemStateChanged(ItemEvent e){    AbstractButton absButton = (AbstractButton)e.getSource();    Color foreground = absButton.getForeground();    Color background = absButton.getBackground();    int state = e.getStateChange();        if(state == e.SELECTED){    absButton.setForeground(foreground);    absButton.setBackground(background);    }    }    };        aCheckBox.addItemListener(itemListener);    frame.add(aCheckBox);    frame.setSize(300,200);    frame.setVisible(true);        }}