Problem with classes

[fraker]

Hi, I'm developping a simple JAVA Applet and I have a problem
I have a class called LUIweb which is the main class. Here is a part of it.

public class LUIweb extends JApplet implements Runnable {

public void run() {
DisplayMessage("JAVA rocks");
}
public void DisplayMessage(String message){
jtextArea.append(message);
middlePanel.removeAll();
middlePanel.add(textScrollPane, BorderLayout.CENTER);
middlePanel.validate();
middlePanel.repaint();
}
}


It displays the message "JAVA rocks" in my JTextArea. But when another class from the same package calls DisplayMessage, nothing is displayed in my JTextArea


public class Data_net extends LUIweb{
public void Test(){
DisplayMessage("NON");
}
}

Have you got any idea to fix that?

Thank you for you help

[mnuttall]

Don't see anything readily.

Need more code.

But do try adding an .invalidate(); before the validate.

[fraker]

I already tried "invalidate()" before validate(), no good result

package applet;

import java.awt.*;
import java.util.Vector;
import java.lang.String;
import javax.swing.*;

import applet.Language;
public class LUIweb extends JApplet  implements Runnable {
	Vector Soft;
	Vector Version;
	
    public JPanel middlePanel = new JPanel();
    public JTextArea textArea = new JTextArea();
    public JScrollPane textScrollPane = new JScrollPane(textArea,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
    public Container container;
    
    public LUIweb(){
    	container = getContentPane();
		textArea = new JTextArea(30,40);
        textArea.setEditable(false);
        middlePanel = new JPanel();
        //textArea.setPreferredSize(new Dimension(400,450));
        
        textScrollPane = new JScrollPane(textArea,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        middlePanel.add(textScrollPane, BorderLayout.CENTER);
        container.add(middlePanel, BorderLayout.CENTER);
    }
    
	public void init(){

		container = getContentPane();
		textArea = new JTextArea(30,40);
        textArea.setEditable(false);
        middlePanel = new JPanel();
        //textArea.setPreferredSize(new Dimension(400,450));
        
        textScrollPane = new JScrollPane(textArea,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        middlePanel.add(textScrollPane, BorderLayout.CENTER);
        container.add(middlePanel, BorderLayout.CENTER);  
      	}
	
	
	public void start() {
        (new Thread(this)).start();
    }

    // Arr?t de l'applet
    public void stop()  {
        while(true);
    }

    // Un nouveau thread pour la r?actualisation de l'applet
    public void run() {
    	DisplayMessage(Language.CONNECT_DB);

		Data_net Donnee_net=new Data_net();
		DisplayMessage("Connecting to "+Donnee_net.GetHost()+" with user "+Donnee_net.GetUser()+"...\n");
Donnee_net.Test();
    }
    public void ShowWish(Vector Softs, Vector Versions,char Action){
    	DisplayMessage(Language.WISH+"\n");
    	for (int i=0;i<Softs.size();i++){
    		String message=(String) Softs.get(i);    		message=message.concat((String) Versions.get(i));
    		String[] t = message.split("\n");
    	    message = t[0];
    	    for (int j=1; j < t.length; j++)
    	      message = message.concat("_".concat(t[j])+"\n");
    	    DisplayMessage("\t"+message);
    	}
    }
    public void DisplayMessage(String message){
    	this.textArea.append(message);
    	this.middlePanel.removeAll();
    	this.middlePanel.add(textScrollPane, BorderLayout.CENTER);
		// repaint
    	this.middlePanel.validate();
    	this.middlePanel.repaint();
    }
	
	public void main(String[] arguments) throws NullPointerException {

	}
}

package applet;

import com.maverick.ssh.*;
import com.maverick.ssh1.Ssh1Client;
import com.maverick.ssh2.*;
import com.sshtools.net.*;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Vector;

import javax.swing.*;


public class Data_net extends LUIweb{
	public Data_net(){
		DisplayMessage("TEST");

		AskHost();
		AskUser();
	}
	public void AskHost(){
		String inputValue = JOptionPane.showInputDialog(Language.ASKHOST);
		hostname=inputValue;
		int idx = hostname.indexOf(':');
		if(idx > -1) {
			port = Integer.parseInt(hostname.substring(idx+1));
			hostname = hostname.substring(0, idx);

		}
	} 
	public void AskPass(){
		Frame frame = new Frame();
		while (frame.password==null);
		password=new String(frame.password);
	}
	public String GetPass(){
		return password;
	}
	public String GetHost(){
		return hostname;
	}
	public String GetUser(){
		return username;
	}
	public void AskUser(){

		String inputValue = JOptionPane.showInputDialog(Language.ASKUSER);
		username = inputValue;
		if(username==null || username.trim().equals(""))
			username = System.getProperty("user.name");
	}
        public void Test(){
                DisplayMessage("NON");
        }
}

So here are two of my classes. Every thing is working but the call of DisplayMessage in Data_net...

I hope it'll help you to find a solution

[mnuttall]

Ok. Lots of issues. I'll skip those. But it looks like the problem (and the issues hide it) is that you don't call the super class' constructor or the init method.

[fraker]

Ok, I've fix it thanks to a friend.

in my LUIweb class, I call a method from Data_net with the reference from LUIweb like that:

Donnee_net.Test(this);

what gives in Data_net class:

public void Test(LUIweb instance){
                instance.DisplayMessage("NON");
}

Here we go!!

Nevertheless thanks for your help mnuttall.

[mnuttall]

Glad you got it working.

But you probably shouldn't have as a parameter to a method the class in which the method exists. Again, not seeing all the code makes it difficult. Calling the super's constructor would definitely be better.