Thread: New paint method? Please help?

Hi guys. So i create little program. So window is in full screen. But i need help with paint method. I think I this method not understeand fully. So code:

 
package Test;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.*;
import java.util.Random;
public class Main extends JFrame {
Graphics g;
	public static void main(String[]args) {
 
		DisplayMode dm = new DisplayMode(800,600,16,DisplayMode.REFRESH_RATE_UNKNOWN);
 
		Main main = new Main();
 
		main.run(dm);
 
 
}
 
	public Main() {
		addKeyListener(new KeysListener());
	}
 
 
	public void run(DisplayMode dm) {
		setBackground(Color.black);
		setForeground(Color.pink);
		setFont(new Font("Arial",Font.BOLD,40));
 
		Screen s = new Screen();
 
		try {
			s.setFullScreenWindow(dm, this);
			try {
			Thread.sleep(30000);
			}catch(Exception e) {
 
			}
		}finally{
			s.restoreWindow();
		}
 
 
	}
 
	public void paint(Graphics g) {
 
		g.fillRect(300, 300, 250, 40);
	}
 
	public void repaint() {
		Random rand = new Random(400);
		g.setColor(Color.RED);
		g.fillRect(rand.nextInt(), rand.nextInt(), 200, 50);
		System.out.println("ADSdas");
	}
 
 
 
	public class KeysListener implements KeyListener {
		Graphics g2 = null;
 
		public void keyPressed(KeyEvent e) {
		int s = e.getKeyCode();
			if(s ==e.VK_O) {
				System.exit(0);
			}
 
			if (s == e.VK_Z) {
			repaint();
			}
		}
 
		@Override
		public void keyReleased(KeyEvent e) {
 
		}
 
		@Override
		public void keyTyped(KeyEvent arg0) {
			// TODO Auto-generated method stub
 
		}
	}
 
 
}

So, paint method works perfectly. He paint rectangle. Good. But I dont know how using ,,paint2'' method. I need when you press z button, ,,paint2'' method draw Oval in random cordination. So instead ,,paint2'' method i using repaint() but i dont know nothing about paint methods and so on. So you can tell me how using ,,paint2'' method? Thanks.. Now when i run program, i get a lot of error..

Thanks for help..
P.S i thought about new object Graphics g2...

I follow this full screen tutorial by youtube thenewboston. Here Screen class:

package Test;
import java.awt.*;
 
import javax.swing.*;
 
public class Screen extends JFrame {
 
	private GraphicsDevice vc;
 
	public Screen() {
		GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
		vc = env.getDefaultScreenDevice();
	}
 
	public void setFullScreenWindow(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 returnWindow() {
		return vc.getFullScreenWindow();
 
	}
 
	public void restoreWindow() {
		Window w = vc.getFullScreenWindow();
 
		if (w != null) {
			w.dispose();
		}
 
		vc.setFullScreenWindow(null);
 
	}
 
 
 
}

I think all is good.

--- Update ---

I little bit read about this. And this help. Thanks!