Question

我对编程很新，我试图将一个不同类的GUI方法调用到我的主类但是遇到了麻烦，当从GUI类运行程序时一切正常但是当我运行主程序时class我在控制台中收到错误消息。

这些是我得到的错误

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: adding container's parent to itself
at java.awt.Container.checkAddToSelf(Unknown Source)
at java.awt.Container.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at mathsQuiz3_1_1.MathsQuiz_3_1_1_Main$1.run(MathsQuiz_3_1_1_Main.java:16)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

这是主要的课程

public static void main(String[] args) {

     SwingUtilities.invokeLater(new Runnable() {
        public void run() {

            Maths_Quiz_3_1_1_GUI GUIObject = new Maths_Quiz_3_1_1_GUI();
            JFrame frame = new JFrame();
            GUIObject.setDefaultCloseOperation(Maths_Quiz_3_1_1_GUI.EXIT_ON_CLOSE);
            GUIObject.getContentPane().add(GUIObject);
            GUIObject.pack();
            GUIObject.setVisible(true);
        }
    });
}

继承GUI类

package mathsQuiz3_1_1;

public class Maths_Quiz_3_1_1_GUI extends JFrame {

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Maths_Quiz_3_1_1_GUI frame = new Maths_Quiz_3_1_1_GUI();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

public Maths_Quiz_3_1_1_GUI() {

    JPanel contentPane;
    JPanel pnlStartScreen = new JPanel();
    JPanel pnlAnswerScreen = new JPanel();
    JPanel pnlQuestionResult = new JPanel();
    JPanel pnlEndScreen = new JPanel();

    ButtonGroup btngrpQuestionType = new ButtonGroup();

    /**
     * JFrame
     */

    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 1100, 700);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(new CardLayout(0, 0));

我删除了其他代码，只是在jframe中添加了更多元素。

我查看了this thread，其中用户遇到了类似的问题并尝试实施解决方案，但仍然没有运气。任何人都可以提供的任何帮助都会有所帮助，因为我是编程新手，并且不确定如何使用GUI和调用方法。

Answer 1

嗯...

是

的组合

线程“AWT-EventQueue-0”中的异常java.lang.IllegalArgumentException：将容器的父项添加到自身

和

 GUIObject.getContentPane().add(GUIObject);

打铃？

从另一个类调用Java GUI方法

1 个答案: