如何在此框架中添加工具栏？
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.net.URL;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
public class Main1 extends JFrame{
JDesktopPane jdpDesktop;
public Main1() {
JFrame frame = new JFrame("MainForm");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jdpDesktop = new JDesktopPane() {
@Override
public Dimension getPreferredSize() {
return new Dimension(600, 600);
}
};
createFrame();
frame.setContentPane(jdpDesktop);
frame.setJMenuBar(createMenuBar());
frame.pack();
frame.setVisible(true);
}
JMenuBar createMenuBar() {
JMenuBar menuBar = new JMenuBar();
JMenu menu = new JMenu("Settings");
JMenuItem menuItem = new JMenuItem("Logout");
menuItem.setMnemonic(KeyEvent.VK_N);
menuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(
null,
"Thank You",
"Logout", JOptionPane.PLAIN_MESSAGE
);
}
});
menu.add(menuItem);
menuBar.add(menu);
return menuBar;
}
protected void createFrame() {
MyInternalFrame frame = new MyInternalFrame();
frame.setVisible(true); jdpDesktop.add(frame);
}
class MyInternalFrame extends JInternalFrame {
static final int xPosition = 150, yPosition = 140;
public MyInternalFrame() {
super("Calculator" , true,
true,
true,
true);
setSize(300, 300);
// Set the window's location.
setLocation(xPosition , yPosition
);
setLayout(null);
getContentPane().setBackground(Color.white);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Main1();
}
});
} }