Very Basic GUI Question

Question

Can anyone tell me why this GUI won't display at all? Thanks
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;  //For colors
import java.awt.event.*;
public class Baseball extends JFrame {
public Baseball(){
    setTitle("Baseball!");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    JPanel panel = new JPanel();
   getContentPane().add(panel,BorderLayout.CENTER);
   panel.setBackground(Color.BLUE);
    setSize(400, 400);
    pack();
    setVisible(true);
     * @param args the command line arguments
    public static void main(String[] args) {
        // TODO code application logic here
       java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Baseball();
}I have no idea what this means: java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() Edited by: Champachikla on Feb 7, 2010 2:01 AM

Answer 1

Dan_Koldyr wrote:
1. avoid pack();/setVisible(true); directly in frame constructor But do not neglect to call pack() at some stage before setVisible(true).
2. invokeLater in main method makes no sense.It does in rare circumstances. (E.G. one visible app. calling the main of another app.)
So i would suggest modify your code like following
public Baseball(){
setSize(400, 400);
No. The previous poster got it right when talking about setting the preferred size. After pack(), your GUI will be shrunk as well.