how to append string to textarea in another class

///second class which haven't text area
public class SecondClass {
    private TextArea tArea;
    SecondClass(TextArea ta) {
        tArea = ta;
    }
    void printOnTextArea() {
        System.out.println("*** printOnTextArea() ***");
        tArea.append("call from Second Class in printOnTextArea()");
    }
}


//main class which have the text area want to print string (when button2 click, print the string)

....
button2.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent arg0) {
        secondClass = new SecondClass(textArea);
        secondClass.printOnTextArea();
    }
});
....