Making a JFrame button create a Alert Dialog. Java - Netbeans

Question

I use NetBeans IDE, as you may know there is a JFrame creator plugin (Its pre-installed) I use it to make JFrames (Because I'm too lazy to do it my self =/). in the event of creating a button within that JFrame it will generate a area for the event code. I was wondering what code i need to type in to generate the Alert Dialog. Heres what is pre-generated upon create a swing/awt component or a JFrame:

    public class NewJFrame extends javax.swing.JFrame {

public NewJFrame() {
    initComponents();
}


@SuppressWarnings("unchecked")
//                           
private void initComponents() {

    jDialog2 = new javax.swing.JDialog();
    jButton1 = new javax.swing.JButton();

    javax.swing.GroupLayout jDialog2Layout = new javax.swing.GroupLayout(jDialog2.getContentPane());
    jDialog2.getContentPane().setLayout(jDialog2Layout);
    jDialog2Layout.setHorizontalGroup(
        jDialog2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 400, Short.MAX_VALUE)
    );
    jDialog2Layout.setVerticalGroup(
        jDialog2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 300, Short.MAX_VALUE)
    );

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setTitle(">:D");
    setResizable(false);
    addHierarchyBoundsListener(new java.awt.event.HierarchyBoundsListener() {
        public void ancestorMoved(java.awt.event.HierarchyEvent evt) {
            formAncestorMoved(evt);
        }
        public void ancestorResized(java.awt.event.HierarchyEvent evt) {
        }
    });

    jButton1.setText("Press Me :D");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jButton1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 349, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jButton1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 180, Short.MAX_VALUE)
    );

    pack();
    setLocationRelativeTo(null);
}//                         

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    //This is the area for the code dialog code
}                                        

private void formAncestorMoved(java.awt.event.HierarchyEvent evt) {                                   
    // TODO add your handling code here:
}                                  

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new NewJFrame().setVisible(true);
        }
    });
}

Did you see the Button1ActionPerformed thing???? that's where the code goes. I need code that will create a new Alert Dialog (javax.swing.JDialog) When that is pressed.

Thanks in advance

Ryan J · Accepted Answer

Sounds like you might want a JOptionPane message dialog...

Try this:

JOptionPane.showMessageDialog(null, "", "Alert", JOptionPane.ERROR_MESSAGE);

So for your case, this is what your action performed method will look like:

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    JOptionPane.showMessageDialog(null, "", "Alert", JOptionPane.ERROR_MESSAGE);        
}

Note there is no "variable" to store the JOptionPane object, it's a static method called on the JOptionPane class. Each time you want an alert/confirm/input/etc. dialog, you generate one on the fly using the static members of the JOptionPane class.

See the reference for more info...

Making a JFrame button create a Alert Dialog. Java - Netbeans

Answers (2)

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