JList is not updating correctly when action listner is a thread

I have a button ActionListener that is a Thread. Within this thread's run method I try to update a JList setListData() method and it does not update. It worked with a combobox but not a JList. I also tried doing it in an invokeLater thread but didn't work.

class Main{
     JButton btn = new JButton();
     JList jList = new JList();
     btn.addActionListern(new ActionListener(){
         actionPerformed(ActionEvent e){
              new ItThread().start();

    class ItThread extends Thread{

             String [] data = new String[2];
             data[0] = "it"
             data[1] ="itd";



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