JButton doesnt show unless you move mouse over it

[liluma]

like said

so all my buttons get created... but I can't see them unless i move my mouse over the place where they are...
then they are visible...

this is my code

package gui;

import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

import domein.DomeinController;

public class StartFrame extends JFrame
{

	/**
	 * 
	 */
	private static final long serialVersionUID = 2823954135081527346L;
	private DomeinController domCntrl;
	private JButton size450, size512, size600;
	
	public StartFrame(DomeinController domCntrl)
	{
		super("connect the dots");
		setDomeinController(domCntrl);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setSize(400,400);
		setResizable(false);
		setLocationRelativeTo(null);
		setVisible(true);
		setLayout(null);
		initGUI();
	}
	
	private void initGUI()
	{
		int midX = this.getWidth()/2-50;
		size450 = new JButton("450*450");
		size450.setBounds(midX, 110, 100,25);
		size450.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent arg0) 
			{
				JOptionPane.showMessageDialog(null, "pressed Button size450");
			}		
		});
		size512 = new JButton("512*512");
		size512.setBounds(midX, 160, 100, 25);
		size512.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent arg0) 
			{
				JOptionPane.showMessageDialog(null, "pressed Button size512");
			}		
		});
		size600 = new JButton("600*600");
		size600.setBounds(midX, 210, 100, 25);
		size600.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent arg0) 
			{
				JOptionPane.showMessageDialog(null, "pressed Button size600");
			}		
		});
		
		this.add(size450);
		this.add(size512);
		this.add(size600);
	}
	
	public void paint(Graphics g)
	{
		g.fillRect(0,0,getWidth(),getHeight());
	}
	
	private void setDomeinController(DomeinController p_dom)
	{
		this.domCntrl = p_dom;
	}
}

someone who has an idea what i did wrong? :o :(

all help is appreciated. ^^

grtz lil

[milovan]

try to call setVisible() after initGUI().

[DarrylBurke]

1. Don't override paint(..) of a top level window. Do invoke the super implementation at the start of any painting method override (unless you are supremely confident that it's not needed).

2. Don't use a null layout. Learn to use the layout managers: Lesson: Laying Out Components Within a Container (The Java™ Tutorials > Creating a GUI With JFC/Swing)

And what milovan said.

db

[liluma]

k ty ^^

will give it a try.

thnks for helping me. tho is a layout recommended? since i'll be use final positions...
grtz liluma

[Fubarable]

Yes, layouts are recommended, and the more complex your GUI, the more it needs to use layouts.