Why does Java Graphics not work with custom sub classes?

I am trying to create a subclass just for circles using the Ellipse2D.Double class.

public class Circle extends Ellipse2D.Double{
double radius;
public Circle (double radius){
		radius = this.radius;
        height = radius*2;
        width = radius*2;
		x = 0;
		y = 0;
}

Filling the JPanel like so does not work:

JPanel p = new JPanel() {
		@Override
		public void paintComponent(Graphics g) {
			Graphics2D g2 = (Graphics2D) g;
        
        Circle circle1 = new Circle(100);
        g2.draw(circle1);

but doing it like so does work:

g2.draw(new Ellipse2D.Double(0, 0, 100, 100));

why is this ? I am setting all the fields from Ellipse2D in the constructor and i am not getting any error messages. So i am not sure why it doesnt work.

Your constructor is incorrect.

        radius = this.radius;

is setting the parameter variable radius to the initial value of the radius field. It should be the other way around.

        this.radius = radius;