Java by API/java.awt.event/ItemEvent

ItemEvent: getItem()

   <source lang="java">

import java.awt.Color; import java.awt.ruponent; import java.awt.Graphics; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import javax.swing.Icon; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel implements ItemListener {

 public MainClass() {
   // Add check boxes to the content pane.
   Icon normal = new MyIcon(Color.red);
   Icon rollover = new MyIcon(Color.YELLOW);
   Icon selected = new MyIcon(Color.BLUE);
   JCheckBox cb = new JCheckBox("www.jexp.ru", normal);
   cb.setRolloverIcon(rollover);
   cb.setSelectedIcon(selected);
   cb.addItemListener(this);
   add(cb);
 }
 public void itemStateChanged(ItemEvent ie) {
   JCheckBox cb = (JCheckBox) ie.getItem();
   int state = ie.getStateChange();
   if (state == ItemEvent.SELECTED)
     System.out.println(cb.getText() + " selected");
   else
     System.out.println(cb.getText() + " cleared");
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame();
   frame.getContentPane().add(new MainClass());
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(200, 200);
   frame.setVisible(true);
 }

} class MyIcon implements Icon {

 Color cl;
 public MyIcon(Color c) {
   cl = c;
 }
 public int getIconWidth() {
   return 32;
 }
 public int getIconHeight() {
   return 32;
 }
 public void paintIcon(Component c, Graphics g, int x, int y) {
   g.setColor(cl);
   g.drawString("jexp.ru", 0, 20);
 }

}

      </source>
   
  
 
  

ItemEvent: getItemSelectable()

   <source lang="java">

import java.awt.BorderLayout; import java.awt.ItemSelectable; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import javax.swing.JComboBox; import javax.swing.JFrame; public class MainClass {

 public static void main(final String args[]) {
   final String labels[] = { "A", "B", "C", "D", "E" };
   JFrame frame = new JFrame("Selecting JComboBox");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JComboBox comboBox = new JComboBox(labels);
   frame.add(comboBox, BorderLayout.SOUTH);
   ItemListener itemListener = new ItemListener() {
     public void itemStateChanged(ItemEvent itemEvent) {
       int state = itemEvent.getStateChange();
       String stateString = 
         ((state == ItemEvent.SELECTED) ? "Selected" : "Deselected");
       System.out.println("Item: " + itemEvent.getItem());
       System.out.println(", State: " + stateString);
       ItemSelectable is = itemEvent.getItemSelectable();
       System.out.println(", Selected: " + selectedString(is));
     }
   };
   comboBox.addItemListener(itemListener);
   frame.setSize(400, 200);
   frame.setVisible(true);
 }
 static private String selectedString(ItemSelectable is) {
   Object selected[] = is.getSelectedObjects();
   return ((selected.length == 0) ? "null" : (String)selected[0]);
 }  

}

      </source>
   
  
 
  

ItemEvent: getStateChange()

   <source lang="java">

import java.awt.Color; import java.awt.ruponent; import java.awt.Graphics; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import javax.swing.Icon; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel implements ItemListener {

 public MainClass() {
   // Add check boxes to the content pane.
   Icon normal = new MyIcon(Color.red);
   Icon rollover = new MyIcon(Color.YELLOW);
   Icon selected = new MyIcon(Color.BLUE);
   JCheckBox cb = new JCheckBox("www.jexp.ru", normal);
   cb.setRolloverIcon(rollover);
   cb.setSelectedIcon(selected);
   cb.addItemListener(this);
   add(cb);
 }
 public void itemStateChanged(ItemEvent ie) {
   JCheckBox cb = (JCheckBox) ie.getItem();
   int state = ie.getStateChange();
   if (state == ItemEvent.SELECTED)
     System.out.println(cb.getText() + " selected");
   else
     System.out.println(cb.getText() + " cleared");
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame();
   frame.getContentPane().add(new MainClass());
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(200, 200);
   frame.setVisible(true);
 }

} class MyIcon implements Icon {

 Color cl;
 public MyIcon(Color c) {
   cl = c;
 }
 public int getIconWidth() {
   return 32;
 }
 public int getIconHeight() {
   return 32;
 }
 public void paintIcon(Component c, Graphics g, int x, int y) {
   g.setColor(cl);
   g.drawString("jexp.ru", 0, 20);
 }

}

      </source>
   
  
 
  

ItemEvent.SELECTED

   <source lang="java">

import java.awt.Color; import java.awt.ruponent; import java.awt.Graphics; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import javax.swing.Icon; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel implements ItemListener {

 public MainClass() {
   // Add check boxes to the content pane.
   Icon normal = new MyIcon(Color.red);
   Icon rollover = new MyIcon(Color.YELLOW);
   Icon selected = new MyIcon(Color.BLUE);
   JCheckBox cb = new JCheckBox("www.jexp.ru", normal);
   cb.setRolloverIcon(rollover);
   cb.setSelectedIcon(selected);
   cb.addItemListener(this);
   add(cb);
 }
 public void itemStateChanged(ItemEvent ie) {
   JCheckBox cb = (JCheckBox) ie.getItem();
   int state = ie.getStateChange();
   if (state == ItemEvent.SELECTED)
     System.out.println(cb.getText() + " selected");
   else
     System.out.println(cb.getText() + " cleared");
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame();
   frame.getContentPane().add(new MainClass());
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(200, 200);
   frame.setVisible(true);
 }

} class MyIcon implements Icon {

 Color cl;
 public MyIcon(Color c) {
   cl = c;
 }
 public int getIconWidth() {
   return 32;
 }
 public int getIconHeight() {
   return 32;
 }
 public void paintIcon(Component c, Graphics g, int x, int y) {
   g.setColor(cl);
   g.drawString("jexp.ru", 0, 20);
 }

}

      </source>