JTextArea getColumns, getRows returning 0

I have a JTextArea I want to display a specific array of lines of text based on the number of columns and rows; but getColumns and getRows are returning zero. The following should give an idea of what I am trying to accomplish:

public class Frame extends JFrame implements ComponentListener {
    ...
    this.textArea = new JTextArea();
    this.textArea.setFocusable(false);
    this.textArea.setFont(new Font(Font.MONOSPACED, Font.BOLD, 20));
    this.add(textArea, BorderLayout.CENTER);
    this.editor = new Editor(new File("test"));
    this.textArea.addComponentListener(this);
    ...
    @Override
    public void componentResized(ComponentEvent ce) {
        this.editor.setHeight(this.textArea.getRows());
        this.editor.setWidth(this.textArea.getColumns());
        drawText();
    }

Why are getRows and getColumns returning zero?