canvasdemo.java

这是《Java 2 简明教程(第2版)》一书配套的源代码。

import java.applet.Applet;
import java.awt.*;
import java.awt.Color;

public class CanvasDemo extends Applet
{
  public void init()
  {
   Canvas1 c=new Canvas1();
   c.setBackground(Color.blue);
   c.setSize(300,270);
   add(c);
  }
}
class Canvas1 extends Canvas{
 public void paint(Graphics g)
  {
  g.setColor(Color.white);
  g.fillArc(40,40,180,100,280,-190);
 }
}