Adicionando JPanels de outras classs ao cardLayout

Eu tenho 3 janelas em 3 classs separadas e gostaria de usar o cardLayout para que, quando você clicar no botão seguinte, a próxima janela apareça. Como faço para adicionar JPanels contendo elementos diferentes para um cardLayout? Esta é a primeira janela: (a única diferença é o fundo – mas representa a ideia de como eu o comprei)

public class Window1 extends JPanel implements ActionListener { static CardLayout cardLayout = new CardLayout(); public Window1() { init(); } private void init() { JPanel jp = new JPanel(new BorderLayout()); JPanel jp2 = new Window2(); //JPanel jp3 = new Window3(); JLabel textLabel = new JLabel("Window1"); jp.setBackground(Color.GREEN); jp.add(textLabel, BorderLayout.CENTER); JButton nextButton = new JButton("NEXT"); nextButton.setActionCommand("next"); nextButton.addActionListener(this); jp.add(nextButton, BorderLayout.EAST); setLayout(cardLayout); add(jp, "string"); add(jp2, "string"); //add(jp3, "string"); } public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equalsIgnoreCase("next")) { // go to the next window cardLayout.next(this); } } private static void createAndShowGUI() { JFrame frame = new JFrame("test"); frame.getContentPane().setLayout(Window1.cardLayout); frame.getContentPane().add(new Window1(), "Center"); frame.getContentPane().add(new Window2(), "Center"); frame.getContentPane().add(new Window3(), "Center"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(550, 450); frame.setVisible(true); } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } } 

A segunda janela:

 public class Window2 extends JPanel implements ActionListener { //static CardLayout cardLayout = new CardLayout(); public Window2() { init(); } private void init() { setLayout(new BorderLayout()); JLabel textLabel = new JLabel("Window2"); setBackground(Color.RED); add(textLabel, BorderLayout.CENTER); JButton nextButton = new JButton("NEXT"); nextButton.setActionCommand("next"); nextButton.addActionListener(this); add(nextButton, BorderLayout.EAST); //setLayout(cardLayout); //JPanel jp3 = new Window3(); //add(jp3, "string"); } public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equalsIgnoreCase("next")) { // go to the next window?? System.out.println("window2"); Window1.cardLayout.next(this); } } } 

E o último:

 public class Window3 extends JPanel implements ActionListener { public Window3() { init(); } private void init() { setLayout(new BorderLayout()); JLabel textLabel = new JLabel("Window3"); setBackground(Color.BLUE); add(textLabel, BorderLayout.CENTER); JButton nextButton = new JButton("NEXT"); nextButton.setActionCommand("next"); nextButton.addActionListener(this); add(nextButton, BorderLayout.EAST); } public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equalsIgnoreCase("next")) { // go to the next window // Window1.cardLayout.next(this); } } } 

Eu fiz um pequeno programa, espero que os comentários escritos no programa possam guiá-lo, para entender como usar o CardLayout.

 import java.awt.*; import java.awt.event.*; import javax.swing.*; /* Here we are first declaring our class that will act as the * base for other panels or in other terms the base for CardLayout. */ 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)); /* Here we be making objects of the Window Series classs * so that, each one of them can be added to the JPanel * having CardLayout. */ 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); /* We need two JButtons to go to the next Card * or come back to the previous Card, as and when * desired by the User. */ 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); /* Adding the ActionListeners to the JButton, * so that the user can see the next Card or * come back to the previous Card, as desired. */ 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 { /* * Here this is our first Card of CardLayout, which will * be added to the contentPane object of JPanel, which * has the LayoutManager set to CardLayout. * This card consists of Two JButtons. */ 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 { /* * Here this is our second Card of CardLayout, which will * be added to the contentPane object of JPanel, which * has the LayoutManager set to CardLayout. * This card consists of a JLabel and a JTextField * with GridLayout. */ 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 { /* * Here this is our third Card of CardLayout, which will * be added to the contentPane object of JPanel, which * has the LayoutManager set to CardLayout. * This card consists of Two JLabels and two JCheckBox * with GridLayout. */ 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); } } 

Existem algumas coisas:

  1. Como seu programa só pode executar 1 método main , cada class não precisa de um, mas o que você executar deve criar uma instância de cada painel que você deseja adicionar ao seu CardLayout .

  2. Você também não parece adicionar sua Window s ao seu CardLayout . Você poderia tentar o seguinte (não solicitado). Isso só seria necessário em uma aula:

     private static void createAndShowGUI() { JFrame frame = new JFrame("test"); frame.getContentPane().setLayout(Window1.cardLayout); frame.getContentPane().add(new Window1()); frame.getContentPane().add(new Window2()); frame.getContentPane().add(new Window3()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(550, 450); frame.setVisible(true); } 
  3. Além disso (e isso pode ser apenas devido à simplicidade do seu exemplo), eu teria apenas 1 class e levaria o nome do painel e a cor do plano de fundo para o construtor. Estes poderiam ser passados ​​em seu método init() e seu design seria um pouco simplificado.