清除JTextArea不起作用

Question

I'm trying to clear a text area that has something written on it. I've been trying to use the repaint() method, since I think that kind of resets the text area, but it hasn't been working.

I'm using the text area along with a list. When members of the list are clicked, the said members will display on the text area. So when they are "deselected", I need the previously-written members to disappear from the text area.

Here is the code for the valueChanged, which is where things happen:

public void valueChanged(ListSelectionEvent e)
{
        Object source = e.getSource();
        int[] indices = songList.getSelectedIndices();
        DecimalFormat df = new DecimalFormat("#0.00");

        Song[] selection = new Song[indices.length];
        for(int i = 0; i < indices.length; i++)
        {
            selection[i] = songCollection[indices[i]];
        }
        if(e.getValueIsAdjusting() == false)
        {
            for(int i = 0; i < selection.length; i++)
            {
                textArea.repaint(); //Shouldn't this work?
                textArea.append(selection[i].getTitle() + " " + selection[i].getArtist() + "    " + df.format(selection[i].getPrice()) + "\n" );

            }

        }               

}

PS, I'm pretty new to Stack Overflow, so if I did something wrong, feel free to tell me.

Answer 1

According to JTextComponent#setText ,

Sets the text of this TextComponent to the specified text. If the text is null or empty, has the effect of simply deleting the old text. When text has been inserted, the resulting caret location is determined by the implementation of the caret class.

So, to clear text from a JTextArea component, either do setText(null) , or setText("") .

Answer 2

As said above.

The setText(" ") also works for text fields btw.