// Fig. 12.14: ListTest.java

// Selecting colors from a JList.

// Java core packages

import java.awt.*;

// Java extension packages

import javax.swing.*;

import javax.swing.event.*;

public class ListTest extends JFrame {

private JList colorList;

private Container container;

private String colorNames[] = { "Black", "Blue", "Cyan",

"Dark Gray", "Gray", "Green", "Light Gray", "Magenta",

"Orange", "Pink", "Red", "White", "Yellow" };

private Color colors[] = { Color.black, Color.blue,

Color.cyan, Color.darkGray, Color.gray, Color.green,

Color.lightGray, Color.magenta, Color.orange, Color.pink,

Color.red, Color.white, Color.yellow };

// set up GUI

public ListTest()

{

super( "List Test" );

// get content pane and set its layout

container = getContentPane();

container.setLayout( new FlowLayout() );

// create a list with items in colorNames array

colorList = new JList( colorNames );

colorList.setVisibleRowCount( 5 );

// do not allow multiple selections

colorList.setSelectionMode(

ListSelectionModel.SINGLE_SELECTION );

// add a JScrollPane containing JList to content pane

container.add( new JScrollPane( colorList ) );

// set up event handler

colorList.addListSelectionListener(

// anonymous inner class for list selection events

new ListSelectionListener() {

// handle list selection events

public void valueChanged( ListSelectionEvent event )

{

container.setBackground(

colors[ colorList.getSelectedIndex() ] );

}

} // end anonymous inner class

); // end call to addListSelectionListener

setSize( 350, 150 );

setVisible( true );

}

// execute application

public static void main( String args[] )

{

ListTest application = new ListTest();

application.addWindowListener(new WindowAdapter()

{ public void windowClosing( WindowEvent event )

{

System.exit( 0 );

}

}

); }

} // end class ListTest