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我真的很生气，因为我知道一个问题，但事实并非如此！每次在 Eclipse 中运行我当前的项目，每次的显示都不一样！我的意思是，我运行它一次，它只显示了我的三个组件。我再次运行它，它显示更多。我再次运行它，它显示三个等等。到底发生了什么。这是我在主字符串 args 中运行的代码：

        JFrame frame = new JFrame("Survey");
    frame.setSize(500, 500);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel panel = new JPanel(new GridBagLayout());
    panel.setBackground(Color.GRAY);
    frame.add(panel, BorderLayout.NORTH);
    GridBagConstraints c = new GridBagConstraints();

    JLabel label1 = new JLabel("First name:");
    c.gridx = 0;
    c.gridy = 0;
    c.insets = new Insets(5, 5, 5, 5);
    panel.add(label1, c);

    JLabel label2 = new JLabel("Last name:");
    c.gridx = 0;
    c.gridy = 1;
    panel.add(label2, c);

    JTextField text1 = new JTextField(10);
    c.gridx = 1;
    c.gridy = 0;
    panel.add(text1, c);

    JTextField text2 = new JTextField(10);
    c.gridx = 1;
    c.gridy = 1;
    panel.add(text2, c);

    JLabel label3 = new JLabel("What is your favorite sport:");
    c.gridx = 0;
    c.gridy = 2;
    c.gridwidth = 2;
    panel.add(label3, c);

    String[] combobox = {"Basketball", "Soccor", "Other"};
    JComboBox cbx = new JComboBox(combobox);
    cbx.setPreferredSize(new Dimension(150, 20));
    c.gridx = 0;
    c.gridy = 3;
    panel.add(cbx, c);

    JLabel label4 = new JLabel("Comments about yourself:");
    c.gridx = 0;
    c.gridy = 4;
    panel.add(label4, c);

    JTextArea area = new JTextArea();
    area.setPreferredSize(new Dimension(185, 100));
    c.gridx = 0;
    c.gridy = 5;
    c.gridheight = 5;
    panel.add(area, c);

    JButton submit = new JButton("Submit");
    submit.setPreferredSize(new Dimension(20, 20));
    c.gridx = 0;
    c.gridy = 6;
    panel.add(submit, c);
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1 回答 1

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根本不需要重新验证。确保您在 EDT 线程上正确创建组件，您将不再有此类问题。查看以下文章http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html

于 2013-04-13T02:45:40.863 回答