topleveldemo.java

JAVA的例子程序

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TopLevelDemo{
    public static void main(String arg[]){
        JFrame frame=new JFrame("TopLevelDemo");
        frame.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                System.exit(0);
                }
            });
     JLabel yellowLabel=new JLabel("");
     yellowLabel.setOpaque(true);
     yellowLabel.setBackground(Color.yellow);
     yellowLabel.setPreferredSize(new Dimension(200,180));
     JMenuBar cyanMenuBar=new JMenuBar();
     cyanMenuBar.setOpaque(true);
     cyanMenuBar.setBackground(Color.cyan);
     cyanMenuBar.setPreferredSize(new Dimension(200,20));
     frame.setJMenuBar(cyanMenuBar);
     frame.getContentPane().add(yellowLabel,BorderLayout.CENTER);
     frame.pack();
    
     frame.setVisible(true);
        }
    }