ListTest

// Fig. 14.24: ListTest.java
// Selecting colors from a JList.

import java.awt.FlowLayout;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.ListSelectionModel;

class ListFrame extends JFrame 
{
   private JList<String> colorJList; // list to display colors
   private static final String[] colorNames = { "Black", "Blue", "Cyan",
      "Dark Gray", "Gray", "Green", "Light Gray", "Magenta",
      "Orange", "Pink", "Red", "White", "Yellow" };
   private static final Color[] colors = { Color.BLACK, Color.BLUE,
      Color.CYAN, Color.DARK_GRAY, Color.GRAY, Color.GREEN, 
      Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE, Color.PINK, 
      Color.RED, Color.WHITE, Color.YELLOW };

   // ListFrame constructor add JScrollPane containing JList to JFrame
   public ListFrame()
   {
      super( "List Test" );
      setLayout( new FlowLayout() ); // set frame layout

      colorJList = new JList<String>( colorNames ); // create with colorNames
      colorJList.setVisibleRowCount( 5 ); // display five rows at once
      
      // do not allow multiple selections
      colorJList.setSelectionMode( ListSelectionModel.SINGLE_SELECTION );

      // add a JScrollPane containing JList to frame
      add( new JScrollPane( colorJList ) );

      colorJList.addListSelectionListener(
         new ListSelectionListener() // anonymous inner class
         {   
            // handle list selection events
            public void valueChanged( ListSelectionEvent event )
            {
               getContentPane().setBackground( 
                  colors[ colorJList.getSelectedIndex() ] );
            } // end method valueChanged
         } // end anonymous inner class
      ); // end call to addListSelectionListener
   } // end ListFrame constructor
} // end class ListFrame

public class ListTest 
{
   public static void main( String[] args )
   { 
      ListFrame listFrame = new ListFrame(); // create ListFrame
      listFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
      listFrame.setSize( 350, 150 ); // set frame size
      listFrame.setVisible( true ); // display frame
   } // end main
} // end class ListTest