MULTIPLE SELECTION LIST

Multiple selection list enables the user to select many items from a JList. A SINGLE_INTERVAL_SELECTION list allows selection of a contiguous range of items in the list by clicking the first item, then holding the Shift key while clicking the last item to select in the range. A MULTIPLE_INTERVAL_SELECTION list allows continuous range selection as described for a SINGLE_INTERVAL_SELECTION list and allows miscellaneous items to be selected by holding the Ctrl key.

// Copying items from one List to another.

// Java core packages

import java.awt.*;

import java.awt.event.*;

// Java extension packages

import javax.swing.*;

public class MultipleSelection extends JFrame {

private JList colorList, copyList;

private JButton copyButton;

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

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

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

// set up GUI

public MultipleSelection()

{

super( "Multiple Selection Lists" );

// get content pane and set its layout

Container container = getContentPane();

container.setLayout( new FlowLayout() );

// set up JList colorList

colorList = new JList( colorNames );

colorList.setVisibleRowCount( 5 );

colorList.setFixedCellHeight( 15 );

colorList.setSelectionMode(

ListSelectionModel.MULTIPLE_INTERVAL_SELECTION );

container.add( new JScrollPane( colorList ) );

// create copy button and register its listener

copyButton = new JButton( "Copy >>>" );

copyButton.addActionListener(

// anonymous inner class for button event

new ActionListener() {

// handle button event

public void actionPerformed( ActionEvent event )

{

// place selected values in copyList

copyList.setListData(

colorList.getSelectedValues() );

}

} // end anonymous inner class

); // end call to addActionListener

container.add( copyButton );

// set up JList copyList

copyList = new JList( );

copyList.setVisibleRowCount( 5 );

copyList.setFixedCellWidth( 100 );

copyList.setFixedCellHeight( 15 );

copyList.setSelectionMode(

ListSelectionModel.SINGLE_INTERVAL_SELECTION );

container.add( new JScrollPane( copyList ) );

setSize( 300, 120 );

setVisible( true );

}

// execute application

public static void main( String args[] )

{

MultipleSelection application = new MultipleSelection();

application.addWindowListener(new WindowAdapter()

{ public void windowClosing( WindowEvent event )

{

System.exit( 0 );

}

}

);

}

} // end class MultipleSelection