试试这个代码片段，希望这些注释可以帮助您理解序列。
import java.awt.*;import java.awt.event.*;import javax.swing.*;public class CardLayoutTest{ private static final String CARD_JBUTTON = "Card JButton"; private static final String CARD_JTEXTFIELD = "Card JTextField"; private static final String CARD_JRADIOBUTTON = "Card JRadioButton"; private static void createAndShowGUI() { Jframe frame = new Jframe("Card Layout Test"); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.setLocationRelativeTo(null); // This JPanel is the base for CardLayout for other JPanels. final JPanel contentPane = new JPanel(); contentPane.setLayout(new CardLayout(20, 20)); Window1 win1 = new Window1(); contentPane.add(win1, CARD_JBUTTON); Window2 win2 = new Window2(); contentPane.add(win2, CARD_JTEXTFIELD); Window3 win3 = new Window3(); contentPane.add(win3, CARD_JRADIOBUTTON); JPanel buttonPanel = new JPanel(); final JButton previousButton = new JButton("PREVIOUS"); previousButton.setBackground(Color.BLACK); previousButton.setForeground(Color.WHITE); final JButton nextButton = new JButton("NEXT"); nextButton.setBackground(Color.RED); nextButton.setForeground(Color.WHITE); buttonPanel.add(previousButton); buttonPanel.add(nextButton); previousButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { CardLayout cardLayout = (CardLayout) contentPane.getLayout(); cardLayout.previous(contentPane); } }); nextButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { CardLayout cardLayout = (CardLayout) contentPane.getLayout(); cardLayout.next(contentPane); } }); // Adding the contentPane (JPanel) and buttonPanel to Jframe. frame.add(contentPane, BorderLayout.CENTER); frame.add(buttonPanel, BorderLayout.PAGE_END); frame.pack(); frame.setVisible(true); } public static void main(String... args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); }}class Window1 extends JPanel{ private ActionListener action; public Window1() { init(); } private void init() { final JButton clickButton = new JButton("CLICK ME"); final JButton dontClickButton = new JButton("DON'T CLICK ME"); action = new ActionListener() { public void actionPerformed(ActionEvent ae) { if (ae.getSource() == clickButton) { JOptionPane.showMessageDialog(null, "Hello there dude!" , "Right Button", JOptionPane.INFORMATION_MESSAGE); } else if (ae.getSource() == dontClickButton) { JOptionPane.showMessageDialog(null, "I told you not to click me!" , "Wrong Button", JOptionPane.PLAIN_MESSAGE); } } }; clickButton.addActionListener(action); dontClickButton.addActionListener(action); add(clickButton); add(dontClickButton); }}class Window2 extends JPanel implements ActionListener { private JTextField textField; public Window2() { init(); } private void init() { setLayout(new GridLayout(1, 2)); JLabel userLabel = new JLabel("Your Name : "); textField = new JTextField(); textField.addActionListener(this); add(userLabel); add(textField); } public void actionPerformed(ActionEvent e) { if (textField.getdocument().getLength() > 0) JOptionPane.showMessageDialog(null, "Your Name is : " + textField.getText() , "User's Name : ", JOptionPane.QUESTION_MESSAGE); }}class Window3 extends JPanel{ private ActionListener state; public Window3() { init(); } public void init() { setLayout(new GridLayout(2, 2)); JLabel maleLabel = new JLabel("MALE", JLabel.CENTER); final JCheckBox maleBox = new JCheckBox(); JLabel femaleLabel = new JLabel("FEMALE", JLabel.CENTER); final JCheckBox femaleBox = new JCheckBox(); state = new ActionListener() { public void actionPerformed(ActionEvent ae) { if (maleBox == (JCheckBox) ae.getSource()) { femaleBox.setSelected(false); JOptionPane.showMessageDialog(null, "Congrats you are a Male" , "Gender : ", JOptionPane.INFORMATION_MESSAGE);} else if (femaleBox == (JCheckBox) ae.getSource()) { maleBox.setSelected(false); JOptionPane.showMessageDialog(null, "Congrats you are a Female", "Gender : ", JOptionPane.INFORMATION_MESSAGE); } } }; maleBox.addActionListener(state); femaleBox.addActionListener(state); add(maleLabel); add(maleBox); add(femaleLabel); add(femaleBox); }}
