新手上路,请大侠指教

下面这个java applet运行了怎么上面什么都没有?class文件能生成.
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Font;
import java.awt.Color;public class test10 extends Applet{ private Font f;
private Color c;

public void init()
{
f=new Font("TimesRoman",Font.BOLD,20);
c=Color.green;
}
public void plain (Graphics g)
{
  g.setFont(f);
  g.setColor(c);
  g.drawString("zhongguo",20,25);
  }
}