Question

我想在Java gui中使用GridBagLayout和GridBagConstraints。当我尝试使用窗口构建器时，我收到以下消息：

The topPanelConstraints component is added to a parent component more than once.

add(TitleLabel,topPanelConstraints); 
add(HomeButton,topPanelConstraints);

不知道我做错了什么，谢谢你的帮助。我正在使用Java Kepler，执行环境JavaSE-1.8。以下是我的代码：

public class topPanel extends JPanel {
    private JLabel TitleLabel;
    private JButton HomeButton;
    private JButton ExitButton;

    public topPanel()
    {
        setBackground(new Color(51, 204, 0));
        setLayout(new GridBagLayout());
        GridBagConstraints topPanelConstraints = new GridBagConstraints();
        TitleLabel = new JLabel("title");
        TitleLabel.setFont(new Font("Arial", Font.PLAIN, 30));
        TitleLabel.setForeground(Color.WHITE);

        topPanelConstraints.gridx = 0;
        topPanelConstraints.gridy = 0;
        add(TitleLabel,topPanelConstraints);

        HomeButton = new JButton("home");
        HomeButton.setFont(new Font("Arial", Font.BOLD, 18));
        HomeButton.setBackground(new Color(224, 255, 255));
        topPanelConstraints.gridx = 1;
        topPanelConstraints.gridy = 0;
        add(HomeButton,topPanelConstraints);

        ExitButton = new JButton("exit");
        ExitButton.setFont(new Font("Arial", Font.BOLD, 18));
        ExitButton.setBackground(new Color(224, 255, 255));
        topPanelConstraints.gridx = 2;
        topPanelConstraints.gridy = 0;
        add(ExitButton,topPanelConstraints);
    }

}

Answer 1

您可以声明另一个GridBagConstraints var，然后不会出现消息。

实际上，您可以忽略此消息;看来是因为您使用Window Builder在UI设计模式下打开此Java源代码。

使用GridBagLayout将组件多次添加到父组件中

1 个答案: