java.awt.graphics.* draw oval function is not working

Question

I need to draw a circle in project I'm working on, I am using java.awt.graphics.* to draw it using the drawOval(); method, but it is not working.

Here is a code snippet:

public void paint(Graphics g)
{
    g.setColor(Color.GREEN);
    g.drawOval(480,480,200,200);
    g.fillOval(480, 480, 200, 200);
}