Thread: Code compiles fine but doesn't run Properly

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


public class DigitalClock extends JFrame {

private static final long serialVersionUID = 1L;

JTextField time;
JPanel panel;

public DigitalClock()
{
super("Java Clock by(Nadir Ali Khan)");
setTitle("Java Clock");
setSize(500,500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setResizable(true);
setLocationRelativeTo(null);

panel = new JPanel();
panel.setLayout(new FlowLayout());

time = new JTextField(10);
time.setEditable(false);
time.setFont(new Font("Arial", Font.PLAIN, 48));
time.setSize(500, 500);

panel.add(time);

add(panel);

Timer t = new Timer(1000, new Listener());
t.start();

}
class Listener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
Calendar a = Calendar.getInstance();

int hour = a.get(Calendar.HOUR_OF_DAY);
int min = a.get(Calendar.MINUTE);
int sec = a.get(Calendar.SECOND);

time.setText(hour + ":" + min + ":" + sec);



}

}


}


public class Mainmain
{
public static void main(String[]args)
{
new Mainmain();

}

public Mainmain()
{
new DigitalClock();
}

}



Code compiled fine but when I run it, the window has to be resized slightly before I can see the time displayed. If I set the Resizeable property to false, the time is not displayed. I want to display the time without having to resize the window.

Add a call to revalidate() at the end of your JFrames constructor.