JTextArae doesn't appears in JFrame

[peter_budo]

I have class which extends JTextArea which I want to attach to JFrame.

here is constructor for for JTextArea

public MoveSelectedFiles()
	{
		area = new JTextArea(10, 40);
		setVisible(true);
	}

and here is JTextArea is added to JFrame

MovedSelectedFiles movedTextArea = new MoveSelectedFiles();
		JPanel panelTextArea = new JPanel();
		panelTextArea.add(movedTextArea);
		frame.add(panelTextArea, BorderLayout.EAST);

The JFrame is build of other 3 components where other 2 are showing OK.
Any suggestions/solutions?

[jwenting]

You create a JTextArea but you don't add it to anything.
As a result it's never displayed.
Setting visible to true isn't going to do it, you need to add the actual JTextArea component to a container (like a JPanel).

[peter_budo]

You create a JTextArea but you don't add it to anything.
As a result it's never displayed.
Setting visible to true isn't going to do it, you need to add the actual JTextArea component to a container (like a JPanel).

don't I do that whit

MovedSelectedFiles movedTextArea = new MoveSelectedFiles();
		JPanel panelTextArea = new JPanel();
		panelTextArea.add(movedTextArea);
		frame.add(panelTextArea, BorderLayout.EAST);

I thought that is corect approche....

[jwenting]

but your movedTextArea isn't a JTextArea according to the rest of the code you posted...
It has a JTextArea as a datafield, but that's it.

[peter_budo]

now you complitely lost me. First you say I need to attach JTextArea to JPanel for example, but when I point to peace of code you say movedTextArea is not JTextArea
so let do it again if we can

public class MoveSelectedFiles extends JTextArea
{
	private JTextArea area;
	
	public MoveSelectedFiles()
	{		
		area = new JTextArea(10, 40);
	}
...
}

this is part of the code where I declare MovedSelectedFiles and provide constructor(some parts I exclude it)

...
MoveSelectedFiles movedTextArea;
MyComponent()
	{
		frame.add(component1, BorderLayout.WEST);
		frame.add(component2, BorderLayout.CENTER);

                // add TextArea to frame
		movedTextArea = new MoveSelectedFiles();
		JPanel panelTextArea = new JPanel();
		panelTextArea.add(movedTextArea);
		frame.add(panelTextArea, BorderLayout.EAST);
        }

bring in MoveSelectedFiles
add two components to frame
add movedTextArea to panelTextArea ( I do understand i'm adding extended JTextArea, am I wrong?)
add panelTextArea to frame

can you please explain where I'm going wrong?

[jwenting]

Your "MoveSelectedFiles" class doesn't work.
You apparently think the contained JTextArea should show up but it never will.

Just add a regular JTextArea instead, and see what happens.

[peter_budo]

what do I have to do in order to get "MoveSelectedFiles" working?

I know it sounds dump but at uni we only extend it dialog boxes, never put together frame of different components declared in seperated class files

[jwenting]

That all depends on what you want that thing to do...
If it's just a textarea scrap it completely ;)

If it's a JPanel with some components, build it just like you would a complete dialog box, and add it to your window.
It would derive from JPanel though, not JTextArea.
If you want a JTextArea with some specific handling, just override some of its methods in it, don't wrap one in it.

[peter_budo]

OK, I got it now, will deal with it as soon I get some break from university

thank you for advice, will pm you with result