What is Form load event handler in Java?

Question

What is the event handler in Java (using net beans) that resembles the From_Load in C#?

Answer 1

This simple sample is useful.

public static void main(String[] args) {

    JFrame fa = new JFrame();
    fa.setBounds(100, 100, 400, 200);
    fa.setVisible(true);
    fa.addWindowListener(new WindowListener() {

        @Override
        public void windowOpened(WindowEvent e) {
            JOptionPane.showMessageDialog(fa, "windowOpened");
        }

        @Override
        public void windowClosing(WindowEvent e) {
            JOptionPane.showMessageDialog(fa, "windowClosing");
        }

        @Override
        public void windowClosed(WindowEvent e) {
            JOptionPane.showMessageDialog(fa, "windowClosed");
        }

        @Override
        public void windowIconified(WindowEvent e) {
            JOptionPane.showMessageDialog(fa, "windowIconified");
        }

        @Override
        public void windowDeiconified(WindowEvent e) {
            JOptionPane.showMessageDialog(fa, "windowDeiconified");
        }

        @Override
        public void windowActivated(WindowEvent e) {
        //                JOptionPane.showMessageDialog(fa, "windowActivated");
        }

        @Override
        public void windowDeactivated(WindowEvent e) {
        //                JOptionPane.showMessageDialog(fa, "windowDeactivated");
        }
    });
}

Answer 2

Whilst the accepted answer is based on the underlying WindowListener interface (which forces you to provide an implementation for each type of event you can use) the WindowAdapter where you can override the appropriate event you are interested in.

public class MySwingJFrame extends JFrame {
    public MySwingJFrame() {
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowOpened(WindowEvent e) {
                // do something
            }
        });
    }
}