How to fix this problem

TrustedApple

class SimpleFrame extends JFrame 
{
    public SimpleFrame()
    {
        setsize(WIDTH, HEIGHT);
    }
    
    public static final int WIDTH = 300; 
    public static final int HEIGHT = 200; 
}

import javax.swing.*;
public class SimpleFrameTest
{
    public static void main (String[] args)
    {
        SimpleFrame frame = new SimpleFrame() ;
        frame.setDefaultCloseOperation
                (JFrame.EXIT_ON_CLOSE);
        
                frame.show();
            }
        }

I am getting this error cannot find symbol - Class JFrame confused in how to do it ?.

Need help fast LoL

maki

You're not importing swing components in your SimpleFrame class.
import javax.swing.*;