Displaying discriptive text to a Java component shuch as JMenuItem or JButton, etc.

Thank you for taking to time to read my post.

Can somebody tell me a good way to display help text for a JMenuitem or JButton?  In other words the text would be displayed in the Frame whenever a particular component is moused over or highlighted.

 I'm thinking something like itemListener or mouse listener would work but I am just not sure what the best approach is.  For example, in the program below, if I wanted to display a message "Selecting this option will close the application " when the user hovers the mouse over the JMenuItem menuItmExit, what would be the best approach to providing this type of functionality?

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class MyMenu extends JFrame
            implements ActionListener
{
      JMenuItem menuItmExit;
 
      public static void main(String[] args)
      {
            MyMenu mm = new MyMenu();
      }

      MyMenu()
      {
            setBounds(100,100, 300, 300);
            setTitle ("My Menu");

            JMenuBar mbar = new JMenuBar();

            JMenu menuFile = new JMenu("File");
            mbar.add(menuFile);
            
            JMenu menuView = new JMenu("View");
            mbar.add(menuView);

            JMenu menuLeaveApp = new JMenu("Leave");
            menuItmExit = new JMenuItem("Exit");
            menuItmExit.addActionListener(this);
            menuLeaveApp.add(menuItmExit);

            mbar.add(menuLeaveApp);

            setJMenuBar(mbar);

            setVisible(true);
      }

      public void actionPerformed(ActionEvent evt)
      {
            if(evt.getSource() == menuItmExit)
                  System.exit(0);
      }

}//End of class MyMenu.