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Listening to JCheckBox Events with a ChangeListener

import javax.swing.AbstractButton; import javax.swing.ButtonModel; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class JCheckBoxChangeListener {   public static void main(String args[]) {     JFrame frame = new JFrame("Iconizing CheckBox");     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     JCheckBox aCheckBox4 = new JCheckBox("Stuffed Crust");     // Define ChangeListener     ChangeListener changeListener = new ChangeListener() {       public void stateChanged(ChangeEvent changeEvent) {         AbstractButton abstractButton =           (AbstractButton)changeEvent.getSource();         ButtonModel buttonModel = abstractButton.getModel();         boolean armed = buttonModel.isArmed();         boolean pressed = buttonModel.isPressed();         boolean selected = buttonModel.isSelected();         System.out.println("Changed: " + armed + "/" + pressed + "/" +           selected);       }     };     aCheckBox4.addChangeListener(changeListener);     frame.add(aCheckBox4);     frame.setSize(300, 200);     frame.setVisible(true);   } } Changed: false/false/false Changed: true/false/false Changed: true/true/false Changed: true/true/true Changed: true/false/true Changed: false/false/true