Java：GUI 没有响应？ [关闭]

Question

在设计基于文本的游戏的过程中，我决定采用在 windows builder 中制作 GUI 的路线，请注意，我刚刚开始学习 GUI，所以请放轻松。

无论如何，问题是在程序启动时出现的假设是 GUI 的窗口实际上是空白的并且不允许我退出，所以我必须在 eclipse 中终止程序。

还要注意在主启动中执行时，它是作为mainGameGUI执行的，而不是在构造函数下。

这是代码。

private static JFrame frame;
private static JTextField txtBeginByTyping;

public static void mainGameGUI() {
    frame = new JFrame();
    frame.setBounds(100, 100, 600, 700);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(null);
    frame.setVisible(true);
    frame.setLocationRelativeTo(null);
    frame.setResizable(false);

    final JTextArea textArea = new JTextArea();
    textArea.setBounds(10, 415, 371, 205);
    textArea.setRows(8);
    textArea.setEditable(false);
    frame.getContentPane().add(textArea);

    JProgressBar progressBar = new JProgressBar();
    progressBar.setBackground(Color.RED);
    progressBar.setToolTipText("");
    progressBar.setForeground(Color.RED);
    progressBar.setValue(Player.currentHp);
    progressBar.setMaximum(Player.maxHp);
    progressBar.setBounds(401, 517, 173, 40);
    frame.getContentPane().add(progressBar);

    JLabel lblYourHealth = new JLabel("Health");
    lblYourHealth.setHorizontalAlignment(SwingConstants.CENTER);
    lblYourHealth.setFont(new Font("Trajan Pro", Font.PLAIN, 16));
    lblYourHealth.setBounds(401, 470, 173, 36);
    frame.getContentPane().add(lblYourHealth);

    JLabel lblDestructivePower = new JLabel("Destruction: " + Player.totalDamage);
    lblDestructivePower.setHorizontalAlignment(SwingConstants.LEFT);
    lblDestructivePower.setFont(new Font("Trajan Pro", Font.PLAIN, 16));
    lblDestructivePower.setBounds(401, 568, 173, 40);
    frame.getContentPane().add(lblDestructivePower);

    JLabel lblNewLabel = new JLabel("Gold Coins: " + Player.currency);
    lblNewLabel.setHorizontalAlignment(SwingConstants.LEFT);
    lblNewLabel.setFont(new Font("Trajan Pro", Font.PLAIN, 16));
    lblNewLabel.setBounds(401, 619, 173, 32);
    frame.getContentPane().add(lblNewLabel);

    JLabel lblNewLabel_1 = new JLabel("Realm of the Gods");
    lblNewLabel_1.setBounds(10, 11, 564, 60);
    frame.getContentPane().add(lblNewLabel_1);

    JLabel lblNewLabel_2 = new JLabel("Images go here");
    lblNewLabel_2.setBounds(10, 82, 564, 322);
    frame.getContentPane().add(lblNewLabel_2);

    txtBeginByTyping = new JTextField();
    txtBeginByTyping.setText("");
    txtBeginByTyping.setBounds(10, 631, 381, 20);
    frame.getContentPane().add(txtBeginByTyping);
    txtBeginByTyping.setColumns(10);
    txtBeginByTyping.addActionListener(new ActionListener()
    {

        public void actionPerformed(ActionEvent e) 
        {
            inputReader.input = txtBeginByTyping.getText();
            textArea.append(inputReader.input + "\n");
            txtBeginByTyping.setText("");
        }

    });
    JScrollPane scrollPane = new JScrollPane();
    scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
    scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
    scrollPane.setBounds(380, 415, 11, 205);
    frame.getContentPane().add(scrollPane);

    JLabel lblNewLabel_3 = new JLabel("Town of Neo");
    lblNewLabel_3.setHorizontalAlignment(SwingConstants.CENTER);
    lblNewLabel_3.setFont(new Font("Trajan Pro", Font.PLAIN, 16));
    lblNewLabel_3.setBounds(401, 416, 173, 40);
    frame.getContentPane().add(lblNewLabel_3);
}

Answer 1

在里面添加完所有组件后，最后调用frame.setVisible(true);。

几点：

1. 永远不要使用null 布局，而是使用适当的布局管理器。

   阅读更多A Visual Guide to Layout Managers，其中详细描述了所有布局管理器以及示例代码。

2. 使用 SwingUtilities.invokeLater() 确保EDT 已正确初始化。

   阅读全文

   • Why to use SwingUtilities.invokeLater in main method?

   • SwingUtilities.invokeLater