import java.awt.*;
public class Circle5_2
{
public static void main(String[] args)
{
Frame frame = new Frame();
Circle myCircle = new Circle(100,100,50);
frame.setSize(300, 300);
frame.setBackground(Color.yellow);
frame.add(myCircle);
frame.setVisible(true);
}
}

import java.awt.*;
import java.applet.*;
 
class Circle extends Applet
{
 
private int x = 0;
private int y = 0;
private double radius = 0;
 
public Circle(int x, int y, double radius)
{
this.x = x;
this.y = y;
this.radius = radius;
}
 
public void paint(Graphics g)
{
g.drawString("Radius: " + getRadius(), 50, 20);
g.drawString("Area: " + getArea(), 50, 40);
g.drawString("Area: " + getCircumference(), 50, 60);
int width = (int)(radius * 2);
int height = (int)(radius * 2);
g.fillOval(x, y, width, height);
}
 
private double getRadius(){
    return radius;
}
 
private double getArea(){
    return Math.PI * radius * radius;
}
 
private double getCircumference(){
    return Math.PI * radius * 2d;
}
 
}

public interface IDraw
{
	public void draw(Graphics g);
}
 
public class Circle implements IDraw
{
	private int x;
	private int y;
	private int radius;
	
	public Circle(int x, int y, int radius)
	{
		this.x = x;
		this.y = y;
		this.radius = radius;
	}
	
	public void draw(Graphics g)
	{
		int width = radius*2;
		g.fillOval(x, y, width, width);
		// draw your string here.
	}
}
 
 
public class Canvas extends JPanel
{
	private Vector circles;
	
	public Canvas()
	{
		circles = new Vector();
	}
	
	public void paint(Graphics g)
	{
		super.paint(g);
		Iterator it = circles.iterator();
		while(it.hasNext())
		{
			IDraw d = (IDraw)it.next();
			d.draw(g);
		}
	}
	
	public void addCircle(Circle c)
	{
		circles.add(c);
	}
}
 
 
public void TestApp
{
	public static void main(String args[])
	{
		JFrame f = new JFrame("test");
		Canvas canvas = new Canvas();
		Circle circle = new Circle(100,100,20);
		f.getContentPane().add(canvas);
		f.setSize(500,500);
		f.setVisible(true);
	}
}