Java Swing - JTable 未显示

Question

我在使用 Java Swing 时遇到了一些麻烦。我正在尝试在顶部制作一个带有控制面板的框架，其中包含一些按钮。在它下面我想要一个 JTable 来显示

我一直在尝试，但表格没有显示。如果我删除顶部的 controlPanel，它有时会显示，有时不会。我在 JTable 的构造函数中使用的代码在同一个应用程序中提供，所以这不是网络错误

public ServerMainFrame(GuiController gc){
    this.gc = gc;
    initGUI();
}

private void initGUI() {
    System.out.println("initiating GUI");
    createFrame();
    addContentPanel();
    addControls();
    //openPopUpServerSettings();
    addSongTable();
}

private void createFrame()
{
    this.setTitle("AudioBuddy 0.1");
    this.setVisible(true);
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    this.setSize(800, 600);
    this.setResizable(false);
    this.setLocationRelativeTo(null);
}

private void addContentPanel()
{
    JPanel p = new JPanel();
    p.setLayout(new FlowLayout());
    p.setSize(new Dimension(800, 600));
    this.setContentPane(p);
}

private void addControls()
{
    JPanel controlPanel = new JPanel();
    controlPanel.setLayout(new FlowLayout());
    controlPanel.setBorder(BorderFactory.createLineBorder(Color.black));
    controlPanel.setSize(700,100);

    // Buttons
    JButton play = new JButton("Play");
    JButton pause = new JButton("Pause");
    JButton stop = new JButton ("Stop");
    JButton next = new JButton("Next");
    JButton prev = new JButton("Previous");     
    controlPanel.add(play);
    controlPanel.add(pause);
    controlPanel.add(stop);
    controlPanel.add(next);
    controlPanel.add(prev);

    // Currently playing
    JLabel playing = new JLabel("Currently playing:");
    controlPanel.add(playing);

    JLabel current = new JLabel("Johnny Cash - Mean as Hell");
    controlPanel.add(current);

    this.getContentPane().add(controlPanel);
}

private void addSongTable()
{
    JTable songTable = new JTable(Server.getSongTableModel());
    songTable.setVisible(true);
    JPanel tablePanel = new JPanel();
    tablePanel.setVisible(true);
    tablePanel.add(songTable);
    songTable.repaint();
    this.getContentPane().add(tablePanel);

    JButton btnMulticastList = new JButton("send list to clients");
    btnMulticastList.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent arg0) {
            Server.MulticastPlaylist();
        }
    });

    getContentPane().add(btnMulticastList);
}

Answer 1

if I remove the controlPanel at the top, it sometimes shows and sometimes not.

• 一切都隐藏在 Server.getSongTableModel() 中，没有人知道不发布 SSCCE硬编码值返回自

• GUI 与 Concurency in Swing 有问题

• XxxModel在构建GUI时不断加载数据，然后出现异常导致描述的问题

The code that I use inside my constructor of my JTable is provided in the same application, so it's no network error

• 不知道你在说什么

• 必须创建一个空的 GUI，参见 InitialTread

• 显示 GUI，然后开始将数据加载到 JTable

• 然后从 SwingWorker 或(描述网络问题)更好地启动 Workers Thread(后台任务)Runnable#Thread(便于捕获异常并单独处理线程)

• 从 Runnable 到 Swing GUI 的输出必须包装到 invokeLater()