draw circle in java

1public void drawCenteredCircle(Graphics2D g, int x, int y, int r) {
2  x = x-(r/2);
3  y = y-(r/2);
4  g.fillOval(x,y,r,r);
5}
6

1// x position, y position, x size, y size.
2ellipse(0, 0, 100, 100);

1public class scratch {
2    public static void main(String[] args) {
3        JFrame window = new JFrame();
4        window.setTitle("Christmas Tree");
5        window.setSize(700, 600);
6        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
7        window.setVisible(true);
8        DrawingComponent DC = new DrawingComponent();
9        window.add(DC);
10    }
11}
12class DrawingComponent extends JComponent{
13      public void paint(Graphics graph0){
14        Graphics2D graph = (Graphics2D) graph0;
15        Ellipse2D.Double circle = new Ellipse.Double(5, 5, 25, 25);
16        graph.fill(circle);
17      }
18}

1import java.awt.*;
2import java.awt.event.*;
3import java.awt.geom.*;
4
5public class DrawCircle extends Frame 
6{
7	// input the value for circle and square.
8	Shape circle=new Ellipse2D.Float(100.0f,100.0f,100.0f,100.0f);
9	
10	// class paint to fill color in circle.
11	public void paint(Graphics g)
12	{
13		Graphics2D ga=(Graphics2D)g;
14		ga.draw(circle);
15		ga.setPaint(Color.blue);
16		ga.fill(circle);
17	}
18		
19	public static void main(String args[])
20	{
21		// create a frame object for circle.
22		Frame frame=new DrawCircle();
23		frame.addWindowListener(new WindowAdapter()
24		{
25			public void windowClosing(WindowEvent we)
26			{
27				System.exit(0);
28		    }
29		});
30		// circle coordinates.
31		frame.setSize(300, 250);
32		frame.setVisible(true);	
33	}
34}
35

1g.drawOval(50,50,100,100);