Thread: I always need to resize my window to see my programs

Whenever I make something in Swing, I always need to resize the window for me to see the graphics on the window. I have been told to use the pack() method on it, which I have, but the problem with it is that it just sets the window to a minimal size, only displaying the x + and -.
For one of the "games" I made, it at first didn't work until resize, then I added a repaint() after the constructor and it worked for me, but when my friends download it they cannot see it

Does anyone know why this happens? What can I do to fix this bug?

EDIT: If you guys want example code, just ask

Does your paintComponent() method include the statement,

super.paintComponent( g );

?

If that doesn't solve it, post a simple program that demonstrates what always happens with your Swing code.

Hi! Thanks for your reply
Unfortunately, that didn't solve it for me
Here is an example program:

import javax.swing.*;
import java.awt.*;
 
class SwingT extends JComponent {
	public void setUp() {
		JFrame f = new JFrame("..");
		f.setSize(500, 500);
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setVisible(true);
		f.add(this);
		f.repaint();
	}
 
	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		g.fillRect(20, 20, 40, 60);
	}
 
	public static void main(String[] args) {
		SwingT t = new SwingT();
		t.setUp();
	}
}

I agree with all andbin says, but I also accept that you may have created this odd construction just as a simple example, and it's useful. It shows that the order in which you do things matters. For example, try this instead:

public void setUp()
{
	JFrame f = new JFrame("..");
	f.setSize(500, 500);
	f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	f.add(this);
	f.setVisible(true);
}

It also demonstrates that it's useful to understand how Swing's painting mechanism works at a deeper level which you can explore by completing the Custom Painting Tutorial.