[java] Componant not being displayed

package app1;

import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;

public class MainClass extends JFrame {

    public static void main(String[] args){
new MainClass();
    }

public MainClass() {
 this.setSize(800, 800);
 this.setTitle("Awesome");
 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 
this.add(new DrawIt());
 
 this.setVisible(true);
}

private class DrawIt extends JComponent{

    public void Paint(Graphics g){

        Graphics2D g2 = (Graphics2D)g;

        Shape s = new Rectangle2D.Float(10,10,40,40);
        g2.setPaint(Color.RED);
        g2.draw(s);
}
    
}
}