ImageIcon构造函数未拾取图像

Question

我当前的代码不是从ImageIcon目录中拾取图像。我100％确定给定的路径是正确的，我不太确定这是什么问题。感谢您的回复。

private JFrame frame;
    private JPanel panel;
    private JLabel label2;
    private JButton button;
    private ImageIcon icon;

    public void window() {

        frame = new JFrame();

        frame.setVisible(true);
        frame.setSize(1300, 800);
        frame.setAlwaysOnTop(false);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("GUI frame");

        panel = new JPanel();
        panel.setBackground(Color.cyan);
        panel.setLayout(null);
        frame.add(panel);


        icon = new ImageIcon("C:/Users/user/image.jpg");
        label2 = new JLabel(icon);
        panel.add(label2);
    }
}