java swing错误对话框

Question

我有一个要显示的对话框，但它给出了编译错误。编译错误在最后部分给出。

import javax.swing.*;

class SwingDemo {
    SwingDemo() {
        JFrame jfrm = new JFrame("A Simple Swing Application");
        jfrm.setSize(275, 100);
        jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JLabel jlab = new JLabel(" Swing means powerful GUIs.");
        jfrm.add(jlab);
        jfrm.setVisible(true);
    }

    public static void main(String args[]) {
        public void run() {
            new SwingDemo();
        }
    }
}

错误是:

Multiple markers at this line
    - Syntax error on token "void", @ expected
    - Syntax error, insert "enum Identifier" to complete EnumHeaderName
    - Syntax error, insert "EnumBody" to complete BlockStatements

Answer 1

只需用这个替换您的主要功能即可。

public static void main(String args[]) {
    // Create the frame on the event dispatching thread.
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            new SwingDemo();
        }
    });
}