JComboBox how to compute for two integers from two JComboBox and have the result in a JTextfield when clicking the JButton

Question

I have 2 JComboBox consisting of numbers combobox1= 1 to 5 and combobox2= 1 to 6.

and when I click my JButton, I

Answer 1

use form.setVisible(true);

then:

    btn.addActionListener(new ActionListener() {

        public void actionPerformed(ActionEvent e) {
            int cb1Int = Integer.parseInt(cb1.getSelectedItem().toString());
            int cb2Int = Integer.parseInt(cb2.getSelectedItem().toString());
            txt.setText(String.valueOf(cb1Int + cb2Int));
        }
    });

Good luck with your homework. ;)