Question

I am trying to wirte java-program.

My Idea:
The main class launches thread for socket connection, also the main class launches Frame with GUI.

package dialogsubsystem2;

import InternetConnection.SocketConnectionThread;

/**
 *
 * @author ACER
 */
public class DialogSubsystemLauncher {

    public SocketConnectionThread connectionSocket = new SocketConnectionThread("192.0.0.100", 2002);

    public DialogSubsystemLauncher() {

        /* Create and display the form */

        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new DialogSubsystemLayoutFrame().setVisible(true);                
            }
        });        

        connectionSocket.start();        
    }


    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here

       DialogSubsystemLauncher dlgLnch = new DialogSubsystemLauncher();


    }
}

The created Frame launches another frames by request from user.

I want to show information about the socket connection (from socket connection thread) on statusbar of all Frames.
But I can’t to access the socket connection thread from Frames.
How should I solve this problem?
How should I launch socket connection thread to have access to it from any Frame?

Answer 1

You need that one of the objects has a reference to the other. I would point to the frame having a refence to the thread (since the thread may be blocked at times by I/O).

Just make the constructor of the Frame accept a thread object and pass the one you created(or add a set method to it).

EDIT:

In answer to aclarations in comments.

It is to the other classes (the Frames) that you create that you need to pass the reference.

public class DialogSubsystemLayoutFrame extends JFrame {
  // You store the reference here.
  private SocketConnectionThread socketConnection = null;

  public DialogSubsystemLayoutFrame(SocketConnectionThread socket) {
    this.socketConnection = socket;
  }
}

From there, you can use this.socketConnection anywhere in the class to operate with it.