如何在Java中最小化JFrame表单时输入数据?

那我该怎么解决呢?有人能帮我吗? 提前感谢您的帮助!谨致问候。

private static final long THRESHOLD = 100;
private static final int MIN_BARCODE_LENGTH = 8;
private final StringBuffer barcode = new StringBuffer();
private long lastEventTimeStamp = 0L;
DefaultListModel dlm = new DefaultListModel();

KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(new KeyEventDispatcher()
        {
            @Override
            public boolean dispatchKeyEvent(KeyEvent e)
            {
                if (e.getID() != KeyEvent.KEY_RELEASED)
                {
                    return false;
                }

                if (e.getWhen() - lastEventTimeStamp > THRESHOLD)
                {
                    barcode.delete(0, barcode.length());
                }

                lastEventTimeStamp = e.getWhen();

                if (e.getKeyCode() == KeyEvent.VK_ENTER)
                {
                    if (barcode.length() >= MIN_BARCODE_LENGTH)
                    {
                        jList1.setModel(dlm);
                        dlm.addElement(barcode.toString().trim());
                    }
                    barcode.delete(0, barcode.length());
                } else {
                    barcode.append(e.getKeyChar());
                }
                return false;
            }
        });