Having trouble understanding Class Graphic

[Bernard Robitaille]

Ok, i am trying to draw circles with a circle object on a jFrame with the input of the user taken with the scan.nextDouble() method, I am in way over my head sadly and I am doing things without fully understanding them. I have only just begun doing graphic, when i say begun we just learned how to make a jFrame. So am i here to ask you for help in understanding
A. how do use an can i use an Abstract class like Graphic with initializing it. i need to use the method circle.getAbscisse() getRadius etc...Any help would be appreciated.

Most of this code comes from reading forums and wikis, i understand most of it but I am just confused on how to apply my circles to these methods. Thank you for taking the time to read

/**
 * @(#)MyCanvas.java
 *
 * MyCanvas application
 *
 * @author 
 * @version 1.00 2009/3/1
 */
import java.util.Scanner;
import java.awt.*;
import javax.swing.*;
public class MyCanvas extends Canvas
{
	public static void main(String[] args)
    {
    	//System.out.println("Enter the x,y an radius values");
    	//Scanner scan = new Scanner(System.in);
    	//Cercle cerc = new Cercle(scan.nextDouble(),scan.nextDouble(),scan.nextDouble());
        MyCanvas canvas = new MyCanvas();
        JFrame frame = new JFrame();
        frame.setSize(800, 800);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(canvas);
        frame.setVisible(true);
        //Graphics graphics;
        //graphics.drawLine(10, 20, 300, 310);
        
       
    }
    public MyCanvas()
    {
    }
    public void paint(Graphics graphics)
    {
 		
        graphics.setColor(Color.white);
        graphics.fillOval(10,10,25,25);
        graphics.setColor(Color.blue);
        graphics.drawOval(10,10,25,25);

    }

}

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