background and foreground color is not changing in full screen window

[Punit Jain]

why my background and foreground color is not changing??

import java.awt.*;
import javax.swing.*;
public class mainScreen extends JFrame{
	public static void main(String args[])
	{
		DisplayMode dm = new DisplayMode(800, 600, 16, DisplayMode.REFRESH_RATE_UNKNOWN);
		mainScreen ms = new mainScreen();
		ms.run(dm);
	}
	public void run(DisplayMode dm)
	{
		setBackground(Color.PINK);
		setForeground(Color.GRAY);
		setFont(new Font("Arial", Font.PLAIN, 24));
		Screen s = new Screen();
		try{
			s.setFullScreen(dm, this);
			try{
				Thread.sleep(5000);
			}catch(Exception e){}
		}finally{
			s.restoreScreen();
		}
	}
	public void paint(Graphics g)
	{		
		g.drawString("This is FullScreen", 200, 200);
	}
}

[Rob Spoor]

Please post an SSCCE. Right now I get compiler errors about missing class "Screen". Since that's doing the actual full screen handling we can't test anything.

That said, overriding the paint method is the AWT way to go. In Swing you override paintComponent. However, JFrame (and JWindow and JDialog) don't have that method; instead you should set its content pane to be some container (usually JPanel) that does override paintComponent.

[Punit Jain]

sorry for not posting the sscce code, here is that, and i also changed my code as you said, although after overriding paintComponent i am able to get background color, but text is not visisble.

import java.awt.*;

import javax.swing.*;
public class mainScreen extends JPanel{
	public static void main(String args[])
	{
		DisplayMode dm = new DisplayMode(800, 600, 16, 

DisplayMode.REFRESH_RATE_UNKNOWN);
		mainScreen ms = new mainScreen();
		ms.run(dm);
	}
	public void run(DisplayMode dm)
	{
		
		setBackground(Color.PINK);
		setForeground(Color.GRAY);
		setFont(new Font("Arial", Font.PLAIN, 24));
		JFrame panel = new JFrame();
		panel.getContentPane().add(this);
		Screen s = new Screen();
		try{
			s.setFullScreen(dm, panel);
			try{
				Thread.sleep(5000);
			}catch(Exception e){}
		}finally{
			s.restoreScreen();
		}
	}
	public void paint(Graphics g)
	{		
		g.drawString("This is FullScreen", 200, 200);
	}
}
class Screen {
	private GraphicsDevice vc;
	public Screen() {
		GraphicsEnvironment env = 

GraphicsEnvironment.getLocalGraphicsEnvironment();
		vc = env.getDefaultScreenDevice();
	}
	public void setFullScreen(DisplayMode dm, JFrame window)
	{
		window.setUndecorated(true);
		window.setResizable(false);
		vc.setFullScreenWindow(window);
		if(dm!=null && vc.isDisplayChangeSupported()){
			try{
				vc.setDisplayMode(dm);
			}catch(Exception e){
				
			}
		}
	}
	public Window getFullScreenWindow()
	{
		return vc.getFullScreenWindow();
	}
	public void restoreScreen()
	{
		Window w = vc.getFullScreenWindow();
		if(w != null)
		{
			w.dispose();
		}
		vc.setFullScreenWindow(null);
	}

}

[Rob Spoor]

You're still overriding paint. Like I said, you should override paintComponent instead:

	/*
	public void paint(Graphics g)
	{		
		g.drawString("This is FullScreen", 200, 200);
	}
	*/
	protected void paintComponent(Graphics g)
	{
		super.paintComponent(g); // never forget this line
		g.drawString("This is FullScreen", 200, 200);
	}

After a short black screen I now get a pink-ish background with grey letters "This is FullScreen".

[Punit Jain]

okay i was not doing this
super.paintComponent(g);
therefore i was not getting it...

Thank you.

[Rob Spoor]

You're welcome.