Replacing one JTextArea with another

In my GUI a have a JTextArea within a JScrollPane that is attached to a container.

        ta = new JTextArea();
        jsp = new JScrollPane(ta);

        container.add(jsp);

I want to be able to replace this JTextArea with ano开发者_StackOverflow中文版ther JTextArea, for example

JTextArea ta1 = new JTextArea("New text area");
ta = ta1;
ta.repaint();

However, when I reassign this JTextArea nothing in the GUI changes. Is there a better/correct way for doing this?

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You should just replace text of textarea with new one.

newTextArea.setText(oldTextArea.getText())

or simply put new text by

newTextArea.setText("new text")

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ta = ta1; 

If you want a component to be shown in a GUI then you need to add(...) the component to the GUI.

panel.add(ta1);
panel.revalidate();
panel.repaint();

Changing the reference does not add a component to the GUI.

This is your second question that attempts to play with the reference of a variable in order to access a GUI component. Again I ask the question why are you doing this. It wasn't required in your last question and I doubt it is required in this question. You have some kind of design problem.