ItemListener

The listener interface for receiving item events.

public interface ItemListener extends EventListener {
    void itemStateChanged(ItemEvent e);
}

void itemStateChanged(ItemEvent e)

Invoked when an item has been selected or deselected by the user. The code written for this method performs the operations that need to occur when an item is selected (or deselected).

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class ItemListenerEx {

    public ItemListenerEx(){

        JComboBox box = new JComboBox();
        box.addItem("One");
        box.addItem("Two");
        box.addItem("Three");
        box.addItem("Four");

        box.addItemListener(new ItemListener(){
            public void itemStateChanged(ItemEvent e){
                System.out.println(e.getItem() + " " + e.getStateChange() );
            }
        });

        JFrame frame = new JFrame();
        frame.getContentPane().add(box);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String [] args) {
        ItemListenerEx obj1 = new ItemListenerEx();
    }
}

Select Some Item on Combo Box and observe the Command Prompt

Output

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