Thread: Issue with JOptionPane showMessageDialog

Hi,

I am wondering why , when I click on the "Add Student" button on the GUI,the message dialog is not popping up. I might be doing something wrong but can't figure it out.

Thanks

 
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
 
 
public class MainWindow extends JFrame implements ActionListener {
 
	JButton addStudent = new JButton("Add Student");
	JButton delStudent = new JButton("Delete Student");
	JButton updateStudent = new JButton("Update Student");
	JButton searchStudent = new JButton("Search Student");
	JButton displayStudent = new JButton("Display Students");
 
	JButton addCourse = new JButton("Add Course");
	JButton delCourse = new JButton("Delete Course");
	JButton updateCourse = new JButton("Update Course");
	JButton searchCourse = new JButton("Search Course");
	JButton displayCourse = new JButton("Display Courses");
 
 
	 private class WindowDestroyer extends WindowAdapter 
	  {
		     public void windowClosing(WindowEvent e) 
		     {
		               System.exit(0); 
		     } 
		}
 
 
	 public MainWindow(){
 
		 super("Main Window");
		 setSize(300,300);
		 setLayout(new GridLayout(5,2));
		 add(addStudent);
		 add(addCourse);
		 add(delStudent);
		 add(delCourse);
		 add(updateStudent);
		 add(updateCourse);
		 add(searchStudent);
		 add(searchCourse);
		 add(displayStudent);
		 add(displayCourse);
		 setVisible(true);
 
	 }
 
 
 
	@Override
	public void actionPerformed(ActionEvent e) {
		String action = e.getActionCommand().trim().toString();
 
		switch(action){
		case "Add Student" :   JOptionPane.showMessageDialog(addStudent, "add button pressed!");
							   break;
 
		case "Add Course" :     JOptionPane.showMessageDialog(addCourse, "add button pressed");
						    	break;
		case "Delete Student": JOptionPane.showMessageDialog(delStudent, "delete button pressed");
							   break;
 
 
		};
 
	}
 
 
	public static void main(String[] args) {
 
	      MainWindow f = new MainWindow();
		}
 
 
}