AWT CONTROLS:CHOICE CONTROLS

Choice defines only the default constructor, which creates an empty list....................

Choice controls:

       The Choice class is used to create a pop-up list of items from which the user may choose. Thus, a Choice control is a form of menu. When inactive, a Choice component takes up only enough space to show the currently selected item. When the user clicks on it, the whole list of choices pops up, and a new selection can be made. Each item in the list is a string that appears as a left-justified label in the order it is added to the Choice object. Choice defines only the default constructor, which creates an empty list.

choice control: constructors

• Choice():   Creates a new choice menu.

choice control:methods

• add( ):To add a selection to the list, call add( ). 

syntax:
         void add(String name)

• getSelectedIndex():Returns the index of the currently selected item.

syntax:
         int getSelectedIndex()

• getSelectedItem():Gets a representation of the current choice as a string.

syntax:
        string getSelectedItem()

• getItemCount() :  Returns the number of items in this Choice menu.

syntax:
         int getItemCount()

• getItem(int index):  Gets the string at the specified index in this Choice menu.

syntax:
      String getItem(int index)

sample program for choice controls

import java.awt.*;
import java.awt.event.*;
public class AwtControlDemo
{
   private Frame mainFrame;
   private Label headerLabel;
   private Label statusLabel;
   private Panel controlPanel;
   public AwtControlDemo()
{
 prepareGUI();
  }
   public static void main(String[] args)
{
  AwtControlDemo  awtControlDemo = new AwtControlDemo();
  awtControlDemo.showChoiceDemo();
   }
  private void prepareGUI()
{
mainFrame = new Frame("Java AWT Examples");
mainFrame.setSize(400,400);
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.addWindowListener(new WindowAdapter()
 {
public void windowClosing(WindowEvent windowEvent)
{
System.exit(0);
}        
});    
  headerLabel = new Label();
  headerLabel.setAlignment(Label.CENTER);
  statusLabel = new Label();        
  statusLabel.setAlignment(Label.CENTER);
  statusLabel.setSize(350,100);
 controlPanel = new Panel();
 controlPanel.setLayout(new FlowLayout());
 mainFrame.add(headerLabel);
 mainFrame.add(controlPanel);
  mainFrame.add(statusLabel);
 mainFrame.setVisible(true);  
   }
 private void showChoiceDemo()
{                                       
headerLabel.setText("Control in action: Choice"); 
final Choice fruitChoice = new Choice();
fruitChoice.add("Apple");
fruitChoice.add("Grapes");
fruitChoice.add("Mango");
fruitChoice.add("Peer");
 Button showButton = new Button("Show");
 showButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
 {     
 String data = "Fruit Selected: "  + fruitChoice.getItem(fruitChoice.getSelectedIndex());
  statusLabel.setText(data);
  }
  }); 
 controlPanel.add(fruitChoice);
 controlPanel.add(showButton);
mainFrame.setVisible(true);  
}
}

output of this program: