import java.awt.*; import java.awt.event.*; import javax.swing.*; /* TopLevelDemo.java requires no other files. */ public class TopLevelDemo { /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("TopLevelDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create the menu bar. Make it have a cyan background. JMenuBar cyanMenuBar = new JMenuBar(); cyanMenuBar.setOpaque(true); cyanMenuBar.setBackground(Color.cyan); cyanMenuBar.setPreferredSize(new Dimension(200, 20)); //Create a yellow label to put in the content pane. JLabel yellowLabel = new JLabel(); yellowLabel.setOpaque(true); yellowLabel.setBackground(Color.yellow); yellowLabel.setPreferredSize(new Dimension(200, 180)); //Set the menu bar and add the label to the content pane. frame.setJMenuBar(cyanMenuBar); frame.getContentPane().add(yellowLabel, BorderLayout.CENTER); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }