I'm trying to work with a non-editable JTextArea added to a JScrollPane. I want a line to be highlighted when the user clicks on that specific line. I could implement this part using the following code:

public static void initHighlightOption(final JTextArea textArea){

    textArea.setFont(new Font("Courier New", Font.PLAIN, 12));
    textArea.setEditable(false);

    final Action selectLine = getAction(textArea, DefaultEditorKit.selectLineAction);

    textArea.addMouseListener(new MouseAdapter() {

        @Override
        public void mouseClicked(MouseEvent e) {
            if (SwingUtilities.isLeftMouseButton(e) && e.getClickCount() == 1) {
                selectLine.actionPerformed(null);
            }
     });

    textArea.setSelectionStart(0);
    textArea.setSelectionEnd(0);
}

public static Action getAction(JTextArea textArea, String name) {
    Action action = null;
    Action[] actions = textArea.getActions();

    for (int i = 0; i < actions.length; i++) {
        if (name.equals(actions[i].getValue(Action.NAME).toString())) {
            action = actions[i];
            break;
        }
    }

    return action;
}

What I want to add is that once a line is highlighted and user scrolls up/down using keyboard up/down key, i want the current line to be highlighted. Is this possible by adding a keyListener? I'm stuck on how highlight data while scrolling up.

The text area contains data like this:

Line1
Line2

Line3

Line4
Line5

(i.e. there might be new lines between two particular lines of data)