//给你一个源程序,参考一下// Java core packages
import java.awt.*;
import java.awt.event.*;// Java extension packages
import javax.swing.*;public class CardDeck extends JFrame implements ActionListener { private CardLayout cardManager;
private JPanel deck;
private JButton controls[];
private String names[] = { "First card", "Next card",
"Previous card", "Last card" }; // set up GUI
public CardDeck()
{
super( "CardLayout " ); Container container = getContentPane(); // create the JPanel with CardLayout
deck = new JPanel();
cardManager = new CardLayout();
deck.setLayout( cardManager ); // set up card1 and add it to JPanel deck
JLabel label1 =
new JLabel( "card one", SwingConstants.CENTER );
JPanel card1 = new JPanel();
card1.add( label1 );
deck.add( card1, label1.getText() ); // add card to deck
// set up card2 and add it to JPanel deck
JLabel label2 =
new JLabel( "card two", SwingConstants.CENTER );
JPanel card2 = new JPanel();
card2.setBackground( Color.yellow );
card2.add( label2 );
deck.add( card2, label2.getText() ); // add card to deck // set up card3 and add it to JPanel deck
JLabel label3 = new JLabel( "card three" );
JPanel card3 = new JPanel();
card3.setLayout( new BorderLayout() );
card3.add( new JButton( "North" ), BorderLayout.NORTH );
card3.add( new JButton( "West" ), BorderLayout.WEST );
card3.add( new JButton( "East" ), BorderLayout.EAST );
card3.add( new JButton( "South" ), BorderLayout.SOUTH );
card3.add( label3, BorderLayout.CENTER );
deck.add( card3, label3.getText() ); // add card to deck // create and layout buttons that will control deck
JPanel buttons = new JPanel();
buttons.setLayout( new GridLayout( 2, 2 ) );
controls = new JButton[ names.length ]; for ( int count = 0; count < controls.length; count++ ) {
controls[ count ] = new JButton( names[ count ] );
controls[ count ].addActionListener( this );
buttons.add( controls[ count ] );
} // add JPanel deck and JPanel buttons to the applet
container.add( buttons, BorderLayout.WEST );
container.add( deck, BorderLayout.EAST ); setSize( 450, 200 );
setVisible( true ); } // end constructor // handle button events by switching cards
public void actionPerformed( ActionEvent event )
{
// show first card
if ( event.getSource() == controls[ 0 ] )
cardManager.first( deck ); // show next card
else if ( event.getSource() == controls[ 1 ] )
cardManager.next( deck ); // show previous card
else if ( event.getSource() == controls[ 2 ] )
cardManager.previous( deck ); // show last card
else if ( event.getSource() == controls[ 3 ] )
cardManager.last( deck );
} // execute application
public static void main( String args[] )
{
CardDeck cardDeckDemo = new CardDeck(); cardDeckDemo.setDefaultCloseOperation(
JFrame.EXIT_ON_CLOSE );
}} // end class CardDeck
import java.awt.*;
import java.awt.event.*;// Java extension packages
import javax.swing.*;public class CardDeck extends JFrame implements ActionListener { private CardLayout cardManager;
private JPanel deck;
private JButton controls[];
private String names[] = { "First card", "Next card",
"Previous card", "Last card" }; // set up GUI
public CardDeck()
{
super( "CardLayout " ); Container container = getContentPane(); // create the JPanel with CardLayout
deck = new JPanel();
cardManager = new CardLayout();
deck.setLayout( cardManager ); // set up card1 and add it to JPanel deck
JLabel label1 =
new JLabel( "card one", SwingConstants.CENTER );
JPanel card1 = new JPanel();
card1.add( label1 );
deck.add( card1, label1.getText() ); // add card to deck
// set up card2 and add it to JPanel deck
JLabel label2 =
new JLabel( "card two", SwingConstants.CENTER );
JPanel card2 = new JPanel();
card2.setBackground( Color.yellow );
card2.add( label2 );
deck.add( card2, label2.getText() ); // add card to deck // set up card3 and add it to JPanel deck
JLabel label3 = new JLabel( "card three" );
JPanel card3 = new JPanel();
card3.setLayout( new BorderLayout() );
card3.add( new JButton( "North" ), BorderLayout.NORTH );
card3.add( new JButton( "West" ), BorderLayout.WEST );
card3.add( new JButton( "East" ), BorderLayout.EAST );
card3.add( new JButton( "South" ), BorderLayout.SOUTH );
card3.add( label3, BorderLayout.CENTER );
deck.add( card3, label3.getText() ); // add card to deck // create and layout buttons that will control deck
JPanel buttons = new JPanel();
buttons.setLayout( new GridLayout( 2, 2 ) );
controls = new JButton[ names.length ]; for ( int count = 0; count < controls.length; count++ ) {
controls[ count ] = new JButton( names[ count ] );
controls[ count ].addActionListener( this );
buttons.add( controls[ count ] );
} // add JPanel deck and JPanel buttons to the applet
container.add( buttons, BorderLayout.WEST );
container.add( deck, BorderLayout.EAST ); setSize( 450, 200 );
setVisible( true ); } // end constructor // handle button events by switching cards
public void actionPerformed( ActionEvent event )
{
// show first card
if ( event.getSource() == controls[ 0 ] )
cardManager.first( deck ); // show next card
else if ( event.getSource() == controls[ 1 ] )
cardManager.next( deck ); // show previous card
else if ( event.getSource() == controls[ 2 ] )
cardManager.previous( deck ); // show last card
else if ( event.getSource() == controls[ 3 ] )
cardManager.last( deck );
} // execute application
public static void main( String args[] )
{
CardDeck cardDeckDemo = new CardDeck(); cardDeckDemo.setDefaultCloseOperation(
JFrame.EXIT_ON_CLOSE );
}} // end class CardDeck
请问楼上具体如何用索引号。