JComboBox.insertItemAt(E item, int index) has the following syntax.
public void insertItemAt(E item, int index)
In the following code shows how to use JComboBox.insertItemAt(E item, int index) method.
/*from w w w . j a v a2 s .co m*/ 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); } }