example17_23.java

不错的教程 适合中高级人员的使用

import java.awt.*;import java.awt.event.*;
import java.awt.geom.*;
public class Example17_23
{  public static void main(String args[]) 
   {  Frame f=new Frame(); 
      f.setSize(600,600); f.setVisible(true); 
      Mycanvas canvas=new Mycanvas();
      f.add(canvas,"Center");f.pack();
      f.addWindowListener(new WindowAdapter()
             {public void windowClosing(WindowEvent e)
                  {System.exit(0); 
                  }
             });
      PrintJob p=f.getToolkit().getPrintJob(f,"ok",null);
      Graphics g=p.getGraphics();
      g.drawRect(30,30,40,40);
      g.dispose();
      p.end();
   }
}
  class Mycanvas extends Canvas
{  Mycanvas()
   {  setSize(200,200);
   }
 public void paint(Graphics g) 
   {  g.drawRect(300,300,40,40);
   }
}