CardLayout（摆动）与按钮上的动作侦听器？

Question

我一直在试图找出CardLayout与按钮 （所以像操作侦听 - 开始于负载了页面级和点击一个按钮切换到不同的“卡”

我的代码不会甚至现在运行我不完全确定为什么 - 大多数实现我可以找到使用ItemListeners和组合框

我所做的基本过程是创建一个主JPanel，但我的卡JPanel到主JPanel，但我的不同的卡片插入到JPanel卡片中，然后将主JPanel添加到帧中以显示...

另外，对于我的一张卡片，我只需要显示一张pi cture - 我以前通过创建一个新的弹出窗口来实现这个功能，但是能够切换帧以显示它......我不知道为什么我无法弄清楚这个问题

这里是我的代码：

import java.awt.*; 

/** 
* Game 
* Main class that specifies the frame and widgets of the GUI 
*/ 
public class Game implements Runnable { 
public void run(){ 

    final String ON_OPEN = "Welcome!"; //Opening frame 
    final String GAME = "Play!"; // Game Frame 
    final String STATS = "Stats"; // Post-Game Stat Frame 
    final String HELP = "Help"; //tutorial frame 
    JPanel cards = new JPanel(); 
    JPanel master; // a panel for the card layout 

    final JFrame frame = new JFrame(ON_OPEN); 
    frame.setLocation(500,200); 

    //Create the master layout for the program 
    master = (JPanel) frame.getContentPane(); 
    master.setLayout(new BorderLayout()); // creating master layout 

    //Create panel for all the cards in CardLayout 
    final CardLayout cLay = new CardLayout(); 
    cards.setLayout(cLay); 


    // all the cards 
    final JPanel help = new JPanel(); 
    final JPanel stats = new JPanel(); 
    final JPanel game = new JPanel (new BorderLayout()); 
    final JPanel open = new JPanel (new FlowLayout()); 


    // setting up ON_OPEN layout - uses JPanel open 

    final ImageIcon img = new ImageIcon("Instructions.png", "My Instructions..."); // the image I want shown under HELP card 
    final JButton info = new JButton("Help"); 
    info.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent e) { 
    //  cLay.show(help, HELP);  // WHAT I NORMALLY SHOULD BE DOING, RATHER JUST MAKE A NEW FRAME FOR THIS THOUGH 
    //  frame.pack(); 

      final JFrame infoFrame = new JFrame("Tutorial"); 
      infoFrame.setLocation(500,50); 
      JLabel tutorialImg = new JLabel(img); 
    //  int w = img.getIconWidth(); 
     // int h = img.getIconHeight(); 
      //infoFrame.setSize(w, h); 
      infoFrame.pack(); 
      infoFrame.add(tutorialImg); 
      infoFrame.setVisible(true); 
     } 
    }); 
    open.add(info); // the open-tutorial button 



    //Add them to the cards JPanel 
    cards.add(open, ON_OPEN); 
    cards.add(help, HELP); 
    cards.add(stats, STATS); 
    cards.add(game, GAME); 

    //Add the cards panel to the Master layout panel 
    master.add(cards); 


    // This code is all commented out because I'm not sure what I'm doing here... 
// frame.add(cards); 
// cLay.show(cards, ON_OPEN); 

// frame.add(open, BorderLayout.CENTER); 

    // Main playing area - I want this to be shown in the GAME card... 

    GridLayout tileGrid = new GridLayout(4,4); 
    final JPanel grid = new JPanel(tileGrid); 
     // game.add(grid, BorderLayout.CENTER); 

    //  grid.setLayout(tileGrid); 
    // frame.add(grid, BorderLayout.CENTER); 


    // Input - holds typing box 
    //  final JPanel status_panel = new JPanel(); 

    // frame.add(cards, BorderLayout.CENTER); 


// frame.add(open, BorderLayout.CENTER); 

    final JTextField typingArea = new JTextField(); 
    typingArea.setFocusTraversalKeysEnabled(false); 
    typingArea.setEditable(true); 
    typingArea.setFocusable(true); 
    typingArea.requestFocus(); 


    frame.add(typingArea, BorderLayout.SOUTH); 
    typingArea.addKeyListener(new KeyAdapter() { 
     public void keyPressed (KeyEvent e) { 
      if (e.getKeyCode() == KeyEvent.VK_ENTER) { // enter key is pressed 
       String userWord = typingArea.getText().toLowerCase(); 
       typingArea.setText(""); 

      } 
     } 
    }); 


    final JLabel status = new JLabel("Running..."); 
    //  status_panel.add(status); 

    // Reset button 
    final JPanel control_panel = new JPanel(); 
    frame.add(control_panel, BorderLayout.NORTH); 



    ] 

    // Put the frame on the screen 
    frame.pack(); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.setVisible(true); 
} 


public static void main(String[] args){ 
    SwingUtilities.invokeLater(new Game()); 
} 

} 

Answer 1

问题：

• 您的代码编译不能通过我们，因为我们没有JLetterField类。
• 您试图将JFrame的contentPane重新添加到自身，并导致异常并且没有意义。

---

编辑1：

• 你最新的代码演示了把一切变成一个非常大的run()方法，但在这样做，你失去了很多，一无所获。
• 我建议摆脱Runnable接口，不需要它，并创建一个真正的OOP兼容类，其中一个具有私有字段以及公有和私有方法。
• 您的actionPerformed方法显示不会尝试更改CardLayout的显示卡。
• 我建议你摆脱代码来显示一个新窗口，并尝试在那里放置卡交换代码。
• 制作您的CardLayout和类显示卡的JPanel字段，以便其他方法可以访问它们并调用其方法。

---

编辑2：

例如下面的代码说明了使用3个Jbutton将卡的交换。一拿到一张卡片，一个拿到一张卡片，以及一个展示如何获取特定的卡（这里是第二个）：

import java.awt.BorderLayout; 
import java.awt.CardLayout; 
import java.awt.Dimension; 
import java.awt.GridLayout; 
import java.awt.event.ActionEvent; 

import javax.swing.*; 

@SuppressWarnings("serial") 
public class CardLayoutEg extends JPanel { 
    private static final String[] CARD_LABELS = { "one", "two", "three", "four", 
     "five", "six", "seven", "eight", "nine", "ten" }; 
    private static final int PREF_W = 400; 
    private static final int PREF_H = PREF_W; 
    private CardLayout cardlayout = new CardLayout(); 
    private JPanel cardHolder = new JPanel(cardlayout); 
    private Action[] actions = { new ShowPreviousAction(), new ShowNextAction(), 
     new ShowTwoCardAction() }; 

    public CardLayoutEg() { 
     for (String cardLabelText : CARD_LABELS) { 
     JLabel cardLabel = new JLabel(cardLabelText, SwingConstants.CENTER); 
     cardHolder.add(cardLabel, cardLabelText); 
     } 

     JPanel btnPanel = new JPanel(new GridLayout(1, 0, 5, 0)); 
     for (Action action : actions) { 
     btnPanel.add(new JButton(action)); 
     } 

     setLayout(new BorderLayout()); 
     add(cardHolder, BorderLayout.CENTER); 
     add(btnPanel, BorderLayout.SOUTH); 
    } 

    @Override 
    public Dimension getPreferredSize() { 
     return new Dimension(PREF_W, PREF_H); 
    } 

    private class ShowPreviousAction extends AbstractAction { 
     public ShowPreviousAction() { 
     super("Previous"); 
     } 

     @Override 
     public void actionPerformed(ActionEvent e) { 
     cardlayout.previous(cardHolder); 
     } 
    } 

    private class ShowNextAction extends AbstractAction { 
     public ShowNextAction() { 
     super("Next"); 
     } 

     @Override 
     public void actionPerformed(ActionEvent e) { 
     cardlayout.next(cardHolder); 
     } 
    } 

    private class ShowTwoCardAction extends AbstractAction { 
     public ShowTwoCardAction() { 
     super("Show Two"); 
     } 

     @Override 
     public void actionPerformed(ActionEvent e) { 
     cardlayout.show(cardHolder, CARD_LABELS[1]); 
     } 
    } 

    private static void createAndShowGui() { 
     CardLayoutEg mainPanel = new CardLayoutEg(); 

     JFrame frame = new JFrame("CardLayout Example"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.getContentPane().add(mainPanel); 
     frame.pack(); 
     frame.setLocationByPlatform(true); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
     public void run() { 
      createAndShowGui(); 
     } 
     }); 
    } 
}