Java tutorial
import javax.swing.ComboBoxModel; import javax.swing.JComboBox; public class Main { public static void main(String[] argv) throws Exception { String[] items = { "A", "A", "B", "B", "C", "C" }; JComboBox cb = new JComboBox(items); cb.setKeySelectionManager(new MyKeySelectionManager()); } } class MyKeySelectionManager implements JComboBox.KeySelectionManager { long lastKeyTime = 0; String pattern = ""; public int selectionForKey(char aKey, ComboBoxModel model) { return 1; } }