circledemo.java

我在学习JAVA的讲义

import java.awt.*;
import java.awt.geom.*;

public class CircleDemo extends Frame
    {
        public static void main(String args[])
	{
	    (new CircleDemo()).setVisible(true);
	}
	public CircleDemo()
	{
	    super("画圆");
	    setSize(200,250);
	}
	public void paint(Graphics g)
	{
	    Graphics2D g2=(Graphics2D)g;
	    g2.setColor(Color.blue);
	    g2.draw(new Ellipse2D.Double(40,40,100,100));
	}
    }