Adding and Removing an Item in a JComboBox Component
import javax.swing.JComboBox;
public class Main { public static void main(String[] argv) throws Exception {
String[] items = { "item1", "item2" };
JComboBox cb = new JComboBox(items);
// Add an item to the start of the list
cb.insertItemAt("item0", 0);
}
}