public class TestClock extends JFrame { private String aorp; private String hour; private String minute; private String second; private Panel p1; public TestClock() { super("time"); this.setSize(1500, 1300); this.setVisible(true); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setLayout(new GridLayout(2, 1)); p1 = new Panel(new GridLayout(1, 3)); JLabel HH = new JLabel(hour, SwingConstants.CENTER); JLabel MM = new JLabel(minute, SwingConstants.CENTER); JLabel SS = new JLabel(second, SwingConstants.CENTER); JLabel AorP = new JLabel(aorp, SwingConstants.CENTER); HH.setFont(new Font(Font.SERIF+":", Font.ITALIC, 36)); MM.setFont(new Font(Font.SERIF+":", Font.ITALIC, 36)); SS.setFont(new Font(Font.SERIF, Font.ITALIC, 36)); AorP.setFont(new Font(Font.SERIF, Font.ITALIC, 26)); p1.add(HH); p1.add(MM); p1.add(SS); this.add(p1); this.add(AorP); this.repaint(); HH.setText(hour); MM.setText(minute); SS.setText(second); AorP.setText(aorp); } public void showTime() { Calendar c = Calendar.getInstance(); hour = Integer.toString(c.get(Calendar.HOUR)); minute = Integer.toString(c.get(Calendar.MINUTE)); second = Integer.toString(c.get(Calendar.SECOND)); aorp = Integer.toString(c.get(Calendar.AM_PM)); } public static void main(String[] args) { // TODO Auto-generated method stub TestClock clock = new TestClock(); while (true) { clock.showTime(); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } }

在你的代码中，`TestClock` 的构造方法中已经将 `JLabel` 对象添加到了窗口中，但是你在 `main` 方法中也添加了一个 `while(true)` 循环，这可能会导致窗口无法正常显示。因此，你应该将 `while(true)` 循环删除，并使用 `Timer` 对象来定时更新窗口中的时间显示。

具体来说，你可以在 `TestClock` 的构造方法中添加以下代码：

Timer t = new Timer(1000, new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        showTime();
        HH.setText(hour);
        MM.setText(minute);
        SS.setText(second);
        AorP.setText(aorp);
    }
});
t.start();

这样，每隔一秒钟，`Timer` 对象就会调用 `showTime()` 方法来更新时间信息，并将更新后的时间信息显示在窗口中。同时，你也需要将 `while(true)` 循环删除，并将 `TestClock` 对象的创建放在 `main` 方法中。

完整代码如下：

public class TestClock extends JFrame {
    private String aorp;
    private String hour;
    private String minute;
    private String second;
    private Panel p1;

    public TestClock() {
        super("time");
        this.setSize(1500, 1300);
        this.setVisible(true);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setLayout(new GridLayout(2, 1));
        p1 = new Panel(new GridLayout(1, 3));
        JLabel HH = new JLabel(hour, SwingConstants.CENTER);
        JLabel MM = new JLabel(minute, SwingConstants.CENTER);
        JLabel SS = new JLabel(second, SwingConstants.CENTER);
        JLabel AorP = new JLabel(aorp, SwingConstants.CENTER);
        HH.setFont(new Font(Font.SERIF + ":", Font.ITALIC, 36));
        MM.setFont(new Font(Font.SERIF + ":", Font.ITALIC, 36));
        SS.setFont(new Font(Font.SERIF, Font.ITALIC, 36));
        AorP.setFont(new Font(Font.SERIF, Font.ITALIC, 26));
        p1.add(HH);
        p1.add(MM);
        p1.add(SS);
        this.add(p1);
        this.add(AorP);
        this.repaint();
        HH.setText(hour);
        MM.setText(minute);
        SS.setText(second);
        AorP.setText(aorp);

        Timer t = new Timer(1000, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                showTime();
                HH.setText(hour);
                MM.setText(minute);
                SS.setText(second);
                AorP.setText(aorp);
            }
        });
        t.start();
    }

    public void showTime() {
        Calendar c = Calendar.getInstance();
        hour = Integer.toString(c.get(Calendar.HOUR));
        minute = Integer.toString(c.get(Calendar.MINUTE));
        second = Integer.toString(c.get(Calendar.SECOND));
        aorp = Integer.toString(c.get(Calendar.AM_PM));
    }

    public static void main(String[] args) {
        TestClock clock = new TestClock();
    }
}

尝试运行这个程序，你就可以看到窗口中正确显示当前的时间了。