Applets

main()is function of course, not constructor

Alex

 Q: Is it possible to run a java applet in a dos window (win98 se)?

Answer: No. A dos window is a character device. You can use the applet viewer program that comes

with the JDK though.

Mike

 Q: Is there a simple way to tell if a PC online or not from within an applet?

Answer: Not without either server side support or signing the applet, since applets are not allowed to

connect to other hosts than the one they are downloaded from. Best approach, I suppose, would be to

ping the target from the server. 

However, this is not quite full proof because of firewalling: my pc, for example, will not answer to

pings.

Michiel

 Q: Is it possible to close browser from applet?

Answer: Yes, use this (tested):

//////////////////////////////////////////////////////

import java.applet.Applet;

import java.awt.*;

import java.awt.event.*;

import netscape.javascript.JSObject;

class CloseApplet extends Applet

implements ActionListener{

   protected Button closeButton = null;

   protected JSObject win = null;

   public void init(){

      this.win = JSObject.getWindow(this);

      this.closeButton = new Button("Close Browser Window");

      this.add(this.closeButton);

      this.closeButton.addActionListener(this);

   } // ends init(void)

   public void actionPerformed(ActionEvent ae){ 

      this.win.eval("self.close();"); 

   }

} // ends class CloseApplet

//////////////////////////////////////////////////////

and the HTML needs to have MAYSCRIPT enabled.

//////////////////////////////////////////////////////

file:///F|/a_jsite/350_tips/applets.htm (8 of 9) [2001 07 08 11:24:47]