在awt中如何来设计灰色按钮

public class Test1 extends javax.swing.JFrame {
    private JButton jButton1;
    private JButton jButton3;
    private JButton jButton2;

    /**
    * Auto-generated main method to display this JFrame
    */
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                Test1 inst = new Test1();
                inst.setLocationRelativeTo(null);
                inst.setVisible(true);
            }
        });
    }
   
    public Test1() {
        super();
        initGUI();
    }
   
    private void initGUI() {
        try {
            setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
            getContentPane().add(getJButton2(), BorderLayout.CENTER);
            getContentPane().add(getJButton3(), BorderLayout.SOUTH);
            getContentPane().add(getJButton1(), BorderLayout.NORTH);
            pack();
            setSize(100, 120);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
   
    private JButton getJButton1(){
        if(jButton1==null){
            jButton1 = new JButton();
            jButton1.setText("jButton1");
            jButton1.addActionListener(new ActionListener(){

                @Override
                public void actionPerformed(ActionEvent e) {
                    getJButton2().setEnabled(false);
                }});
        }
        return jButton1;
    }

    private JButton getJButton2() {
        if (jButton2 == null) {
            jButton2 = new JButton();
            jButton2.setText("jButton2");
            jButton2.addActionListener(new ActionListener(){

                @Override
                public void actionPerformed(ActionEvent e) {
                    getJButton1().setEnabled(false);
                }});
        }
        return jButton2;
    }

    private JButton getJButton3() {
        if (jButton3 == null) {
            jButton3 = new JButton();
            jButton3.setText("jButton3");
            jButton3.addActionListener(new ActionListener(){

                @Override
                public void actionPerformed(ActionEvent e) {
                    getJButton2().setEnabled(true);
                    getJButton1().setEnabled(true);
                }});
        }
        return jButton3;
    }
}