How to get all elements inside a JFrame?

Question

I have this code to get all the elements I need and do some processing. The problem is I need to specify every panel I have to get the elements inside it.

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Answer 1

            for (Component c : mainPanel.getComponents()) {
                for (Component sc : ((JPanel) c).getComponents()) {
                    if (sc instanceof JTextField) {
                        //process
                    }
                }
            }

in my code, im just getting all instances of jtextfield. u can use same logic. this is just example of getting all sub-components from components you have taken. Hope it will help u out.