Java Swing Combobox removeAllItems calling ItemStateChanged also?

Question

My code is quite simple actually. I saw a simple and similar code was from this article.

At first, I have 1 combobox. I have a listener on it called

Answer 1

The method removeAllItems does not call ItemStateChanged, but it call actionPerformed, you can check it by running this simple code:

public class Tuto {

    public static void main(String[] args) {
        //create the main frame
        JFrame frame = new JFrame();
        frame.setResizable(false);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setLayout(null);
        frame.setLocation(new Point(10, 10));
        frame.setPreferredSize(new Dimension(400, 300));

        JComboBox combo = new JComboBox();
        combo.addItem("item 1");
        combo.addItem("item 2");
        combo.addItem("item 3");
        combo.setBounds(50, 30, 300, 20);
        combo.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                System.out.println(" action Performed ");
            }
        });
        frame.add(combo);

        JButton button = new JButton("Remove");
        button.setBounds(50, 100, 100, 30);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                combo.removeAllItems();
            }
        });
        frame.add(button);

        frame.pack();
        frame.setVisible(true);
    }

}