To disable the first index, on the click of a button, let us implement for index > 0 i.e. item 2:
System.out.println("Index 0 (First Item) is disabled... "); comboBox.addItemListener(e -> { if (comboBox.getSelectedIndex() > 0) { System.out.println("Index = " + comboBox.getSelectedIndex()); } });
By implementing above, we have disabled the first item.
The following is an example to disable the first item on a JComboBox:
import javax.swing.*; public class SwingDemo { JFrame frame; SwingDemo(){ frame = new JFrame("ComboBox"); String Sports[]={"Select","Tennis","Cricket","Football"}; JComboBox comboBox = new JComboBox(Sports); comboBox.setBounds(50, 50,90,20); frame.add(comboBox); frame.setLayout(null); frame.setSize(400,500); frame.setVisible(true); System.out.println("Index 0 (First Item) is disabled... "); comboBox.addItemListener(e -> { if (comboBox.getSelectedIndex() > 0) { System.out.println("Index = " + comboBox.getSelectedIndex()); } }); } public static void main(String[] args) { new SwingDemo(); } }
The output is as follows. You can now select all the indexes except index 0 (first item). Let us select the first index i.e. the second item:
Meanwhile, while selecting Tennis above, the following is displayed on Console: