public class circle extends JFrame
{
circle(String s)
{
super(s);
add(new circlePanel());
setSize(700, 700);
setVisible(true);
}
class circlePanel extends JPanel
{
public circlePanel()
{
setBackground (Color.cyan);
setSize(500, 500);
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
int biggestRadius = -1;
int saveX = -1, saveY = -1, saveRadius = -1;
for(int i = 0; i < 15; i++)
{
g.setColor(Color.black);
int x = new Random().nextInt(this.getWidth());
int y = new Random().nextInt(this.getHeight());
int radius = new Random().nextInt(30);
if(radius > biggestRadius)
{
saveX = x;
saveY = y;
saveRadius = radius;
biggestRadius = radius;
}
else
{
g.drawOval(x, y, radius*2, radius*2);
}
}
g.fillOval(saveX, saveY, saveRadius*2, saveRadius*2);
}

}//end circlePanel

public static void main(String[] args)
{
new circle("circle").setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
}
}//end circle