Thread: I don't know what's wrong

I'm trying to display an oval but the oval doesn't show.
This is my code:

package guitut;
import javax.swing.*;
import java.awt.*;
 
public class GUItut {
static int x = 50;
static int y = 50;
  private static class BallAnimate extends JPanel {
      public void paintComponent(Graphics g)
      { super.paintComponent(g);
      g.drawOval(x, y, 50, 100);
 
  }
}
    public static void main(String[] args) {
      BallAnimate displayPanel = new BallAnimate();
       JPanel content = new JPanel();
       content.add(displayPanel);
 
      JFrame window = new JFrame();
   window.setContentPane(content);
      window.setSize(400,400);
      window.setVisible(true);
    }
}

First of all...you must add your content do "window". second, if you put into panel another panel you need to set LayoutManager

For debugging these kinds of problems I set the colors of the different components to see where and if they are showing up.
Try adding this after you create the object:

displayPanel.setBackground(Color.yellow);