Urgent Java help needed, please!

[Theo]

Urgent!
Help!

As part of an old assignment, I was told to discuss two uses for a layout of buttons/text areas/labels. Being the smart-arse that I am, I decided to go a little more advanced, and show off my technical know-how. I discussed a parallel LCD configuration device, and a network monitoring tool.

Oh guess what! The next assignment is - program one of your ideas.

I've been doing java for about a month now (2x1 hour lectures a week + basic fumbling around with JCreator). That's seriously not enough to be able to get this assignment finished for tomorrow. So I'm begging for a little help, here - just a pointer in the right direction would be massively appreciated.


I have this:

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.net.*;
import java.io.*;

public class MyIP {
  public static void main(String args[]) {
    String ip = new MyIP().myIP();
    System.out.println(ip);
  }

  public String myIP() {
    try {
      return InetAddress.getLocalHost().getHostAddress();
    } 
    catch (IOException e) {
      return "unknown";
    }
  }
}

What I need it to do, however, is to print the IP on a Label... I really have no idea how to incorporate the above into my code. Gah!

[DaBeeeenster]

This not help?

http://java.sun.com/docs/books/tutor...nts/label.html

What sort of app is it? Application? Applet? Why not get a web server to print out the IP?

[Theo]

It's an Applet, chap.

Basically, the user opens the applet on their machine and they're presented with their ip address in label form.

import java.awt.*;
import java.applet.*;
import java.net.*;
import java.io.*;

public class MyIP extends Applet {
  static String ip;
  Label l1;
  public static void main(String args[]) {
    ip = new MyIP().myIP();
    System.out.println(ip);
  }

  public String myIP() {
    try {
      return InetAddress.getLocalHost().getHostAddress();
    } 
    catch (IOException e) {
      return "unknown";
    }
  }
  public void init() {
  	l1 = new Label();
  	add (l1);
  	l1.setText(ip);
  }
}

I've tried that - it compiles, but nothing is displayed in the applet.

[Slick]

whats with the
ip = new MyIP().myIP();

shouldn't it just be something like
String ip = new String(myIP());

and why have you made ip static?

[DsW]

Basically, the user opens the applet on their machine and they're presented with their ip address in label form.

Ok - Applets do not need a main() method. The init() method is run on an applet on its first invocation - you can do the label setup here.
Keep it simple.

Basically, all you need to do is implement an init() method that

1. creates a label
2. set the label text to that of the IP address
3. add the label

Thats it.

e.g.

	public void init()
	{
		JLabel label = new JLabel();
		
		try {
			  label.setText(InetAddress.getLocalHost().getHostAddress());
			} 
			catch (IOException e) {
			}
			
		add(label);
	}

cheers,
dave

[Theo]

whats with the
ip = new MyIP().myIP();

shouldn't it just be something like
String ip = new String(myIP());

and why have you made ip static?

Because I'm a newbie who knows not what he's doing

wilkied, you've saved my life. Thanks chap... all I've got to do now is event handlers for 6 buttons, 3 text areas, and 2 checkboxes :|

[Theo]

I'd just like to say thanks to all of you, actually - for reading and pointing me in the general direction. Much appreciated.