JComboBox class

JComboBox class:

The JComboBox class is used to create the combobox (drop-down list). At a time only one item can be selected from the item list.

Commonly used Constructors of JComboBox class:

JComboBox()

JComboBox(Object[] items)

JComboBox(Vector<?> items)

Commonly used methods of JComboBox class:

1) public void addItem(Object anObject): is used to add an item to the item list.

2) public void removeItem(Object anObject): is used to delete an item to the item list.

3) public void removeAllItems(): is used to remove all the items from the list.

4) public void setEditable(boolean b): is used to determine whether the JComboBox is editable.

5) public void addActionListener(ActionListener a): is used to add the ActionListener.

6) public void addItemListener(ItemListener i): is used to add the ItemListener.

Example of JComboBox class:

1.    import javax.swing.*;  

2.    public class Combo {  

3.    JFrame f;  

4.    Combo(){  

5.        f=new JFrame("Combo ex");  

6.          

7.        String country[]={"India","Aus","U.S.A","England","Newzeland"};  

8.          

9.        JComboBox cb=new JComboBox(country);  

10.     cb.setBounds(50, 50,90,20);  

11.     f.add(cb);  

12.       

13.     f.setLayout(null);  

14.     f.setSize(400,500);  

15.     f.setVisible(true);  

16.       

17. }  

18. public static void main(String[] args) {  

19.     new Combo();  

20.       

21. }  

22. }