ItemListener in Java Swing Examples

Item events occur when a user selects a choice item, a checkbox menu item or a list item. Objects representing item events are created from the ItemEvent class.

The corresponding listener interface for ItemEvent class is ItemListener. Each listener for ItemEvent should implement the ItemListener interface. This listener defines the following method to handle ItemEvent generated by a user interface component.

void itemStateChanged(ItemEvent e)

It is called when the selected item changes.

import javax.swing.*; 
 import java.awt.*;     
 import java.awt.event.*; 
 class ItemListenerExample extends JFrame implements ItemListener 
 { 
     JLabel lblData; 
     JComboBox cbofont; 
     ItemListenerExample() 
     {  
         setLayout(new FlowLayout()); 
         lblData = new JLabel("Font Displayed"); 
         String[] fontData ={"Arial","Courier New", "Arial Black", "Times New Roman"}; 
         cbofont = new JComboBox(fontData); 
         cbofont.addItemListener(this); 
         add(lblData); 
         add(cbofont);  
     } 
      public void itemStateChanged(ItemEvent e) 
     { 
          String fontName=(String)cbofont.getSelectedItem(); 
          Font font = new Font(fontName,Font.PLAIN,12); 
          lblData.setFont(font); 
     } 
 } 
 class ItemListenerJavaExample 
 { 
    public static void main(String args[]) 
    { 
       ItemListenerExample frame = new ItemListenerExample(); 
       frame.setTitle("ItemListener Java Example"); 
       frame.setBounds(200,150,180,150); 
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       frame.setResizable(false); 
       frame.setVisible(true); 
   } 
 }