circledemo.java

这是《Java 2 简明教程(第2版)》一书配套的源代码。

import java.awt.*;
import java.applet.*;
import java.awt.geom.*;
import java.awt.Graphics;

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));
}
}