Redirecting Output

[Richard Davis]

I'm probably just being dumb here, as I'm new to Java, but here goes:

I have a JPanel, containing 2 seperate JPanels and a JScrollPane. The JPanels are both instances of seperate classes (which extend JPanel), which contain all the required bits for various tasks (eg. connecting to another system).

What I want to do is reflect status updates etc (as text) from these sub-panels to the JScrollPane in the main panel. I thought about writing the status updates to a StringBuffer belonging to the sub-panels, and then retrieving this and writing it to the JScrollPane, but as the events within these panels (which generate the status updates) are all driven from within the classes I don't know how to trigger the text to be written back to the JScrollPane.

An alternative might be to re-direct the System.out.println() output to the JScrollPane, but I don't know if this is possible...

Help!

Richard

[Craig Wood]

Send a reference so the other (JPanel) classes can post their updates directly from their event code as needed.

class Central
{
    ClassOne one = new ClassOne(this);
    ClassTwo two = new ClassTwo(this);
    JTextArea ta;
 
    public Central()
    {
        ta = new JTextArea(20,5);
        ...
        JFrame frame = new JFrame();
        frame.getContentPane().add(one, "North");
        frame.getContentPane().add(new JScrollPane(ta), "South");
        ...
    }
}
 
class ClassOne extends JPanel
{
    Central central;
 
    public ClassOne(Central central)
    {
       this.central = central;
    }
 
    // in event code somewhere later...
        central.ta.append(latestNewsFromClassOne);
    ...
}
 
class ClassTwo extends JPanel
{
 
}

[Richard Davis]

Cheers Craig - works like a charm...
...however, in a couple of places I'm creating the 'other' class from within an inner class of the main ('Central') class (specifically the actionPerformed method of a button listener class, implementing ActionListener) - how in this case do I reference the 'this' of the outer class to pass to the constructor of the 'other' class?

[Richard Davis]

Cheers Craig - works like a charm...
...however, in a couple of places I'm creating the 'other' class from within an inner class of the main ('Central') class (specifically the actionPerformed method of a button listener class, implementing ActionListener) - how in this case do I reference the 'this' of the outer class to pass to the constructor of the 'other' class?

[Richard Davis]

Hang fire on that - I've got it!

Cheers for the help,

Richard

ps: If anyone cares, I added:

Central myCentral = this;

to the outer code, and could then pick up the variable myCentral within the inner class to pass on to the other classes