Display text to a label from another class - JFrame

Question

I have a GUI screen, and it has a label in it. I now want to set the label with a text as i have shown in below (Test). But it\'s not getting updated. I think t

Answer 1

Change the mainScreen() function to

public  void mainScreen() {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

remaining code is same