import java.awt.Graphics;
import javax.swing.JApplet;
  pubilc class J_HelloApplet extends JApplet
  {
  public void paint(Graphics g)
{
g.clearRect(0,0,getWidth(),getHeight());
    g.drawString("小应用程序,您好!",10,20);
    }
}老师出现“ 需要为class,interface和enum”
貌似是第三行出现错误