复选框组件

public class CheckBoxTest extends JFrame{

    private static final long serialVersionUID = 1L;
    private JPanel panel1 = new JPanel();
    private JPanel panel2 = new JPanel();
    private JTextArea jt = new JTextArea(3,10);
    private JCheckBox jc1 = new JCheckBox("1");
    private JCheckBox jc2 = new JCheckBox("2");
    private JCheckBox jc3 = new JCheckBox("3");
    public CheckBoxTest() {
        Container c = getContentPane();
        setSize(200, 160);
        setVisible(true);
        setTitle("复选框的使用");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        c.setLayout(new BorderLayout());
        
        c.add(panel1, BorderLayout.NORTH);
        final JScrollPane scrollPane = new JScrollPane(jt);
        panel1.add(scrollPane);
        
        c.add(panel2, BorderLayout.SOUTH);
        panel2.add(jc1);
        jc1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                if(jc1.isSelected()){
                    jt.append("复选框1被选中
");
                }
            }
        });
        panel2.add(jc2);
        jc2.addActionListener(new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                if(jc2.isSelected()){
                    jt.append("复选框2被选中
");
                }
            }
        });
        panel2.add(jc3);
        jc3.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                if(jc3.isSelected()){
                    jt.append("复选框3被选中
");
                }
            }
        });
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new CheckBoxTest();
    }

}