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Thread: Issue with JOptionPane showMessageDialog

  1. #1
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    Default 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();
    		}
     
     
    }


  2. #2
    Administrator copeg's Avatar
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    Default Re: Issue with JOptionPane showMessageDialog

    See the steps outlined in the following (specifically step 2):
    How to Write an Action Listener (The Java™ Tutorials > Creating a GUI With JFC/Swing > Writing Event Listeners)

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