error "The method setDefaultCloseOperation(int) is undefined for the type Frame"

I am using Visual Studio Code 2020, and it is giving me the error "The method setDefaultCloseOperation(int) is undefined for the type Frame"

The problem is line 52,

        import java.awt.Frame;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import java.awt.Color;

public class Main {

    public static void main(String[] args) {
        
        boolean loop = false;

        /* while (loop = true) {

            try {
                Thread.sleep(2000);
            } catch (InterruptedException reallyIgnored) {}

            System.out.println("Loop is working.");

        } */

    }

static class GraphicsEngine extends Component {

    public void paint(Graphics g) {

        // Creating Graphics Shortcut

        Graphics2D g2d = (Graphics2D)g;

        // Creating new framw window, declaring size

        Frame frame = new Frame();

        frame.add(new GraphicsEngine());

        int frameWidth = 700;

        int frameHeight = 500;

        frame.setSize(frameWidth, frameHeight);

        frame.setLayout(null);

        frame.setLocationRelativeTo(null);

        frame.setResizable(false);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setVisible(true);

        frame.pack();

        /* Next part will create dot that moves across screen.
        It will have a loop that draws the dot, and also a loop
        that erases the previous dot. */

        g2d.SetColor(new Color(255, 255, 255));

        g2d.fillRect(0, 0, getSize().height-1, getSize().height-1);

        }

    }

}

I have tried looking for answers, but none of the ones I found had worked.

I am a noob, and picked up java a few days ago. I don't really understand much, but I am trying to learn how graphics work right now

The error means that the setDefaultCloseOperation(int) is not found as a method of your object frame . This could be because there is no method with that name in the frame object, or if there is such a method, there isn't one that takes a single int argument.

Looking up the API here for Frame and JFrame:
https://docs.oracle.com/javase/7/docs/api/java/awt/Frame.html https://docs.oracle.com/javase/7/docs/api/javax/swing/JFrame.html

setDeaultCloseOperation seems to be defined for the JFrame object, and not Frame. JFrame extends Frame, meaning it is a specific kind of frame. Specifically, it is a frame that has the setDefaultOperation() method.

Perhaps change your frame definition to Frame frame = new JFrame();
or JFrame frame = new JFrame();

Your tag says you are asking about a JFrame, which does have the setDefaultCloseOperation(...) method.

However, your code is using Frame which is an AWT component, not a Swing component. Use a JFrame for Swing.

Also, you class is extending Canvas. For a Swing application you should be extending JPanel and overriding paintComponent().

There is no need to use AWT components when you can use Swing.

> I am trying to learn how graphics work right now

First of all you should NEVER create a component in a painting method. A painting method should only use the Graphics object to do painting.

Read the section from the Swing tutorial on Custom Painting for working examples to get you started.

Follow the examples from the tutorial for properly structured code. The code you posted here is mostly wrong.