java.lang.IllegalArgumentException：無法添加到layout：約束必須是字符串

Question

我的代碼中的CardLayout Manager遇到了問題。 我無法弄清楚為什么我會得到這個例外。 我在CardLayout.show()方法中傳遞一個字符串但仍然出現此錯誤。 請幫忙。 這是我的主要課程。

@SuppressWarnings("serial")
public class Main extends JFrame implements ActionListener {

final static String mainMenuPanel = "Main Menu";
final static String creditsPanel = "Credits";
final static String introPanel = "Introduction";

private CardLayout cardLayout = new CardLayout();
private JPanel cards = new JPanel(cardLayout);


public Main(){
    //Create and set up the window.
    super();
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setLayout(new CardLayout());   
    //this.pack();
    this.setVisible(true);
    this.setSize(new Dimension(800,600));
    this.setLocationRelativeTo(null);
    this.setTitle("Wise Frog Productions.");
    cards.add(new IntroGamePanel(),introPanel);
    cards.add(new MainMenu(),mainMenuPanel);
    this.add(cards);
    swapView(mainMenuPanel);

}
public void swapView(String s){
    cardLayout.show(cards,s);
}
public void actionPerformed(ActionEvent event){

}

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

這是我在外面上課，我正在交換卡片。

public class IntroGamePanel extends JPanel implements MouseInputListener{
private Main main;
ImageIcon beginButtonIcon1 = new ImageIcon(IntroGamePanel.class.getResource("begin_0.gif"));
ImageIcon beginButtonIcon2 = new ImageIcon(IntroGamePanel.class.getResource("begin_1.gif"));
JButton beginButton = new JButton("", beginButtonIcon1);

public IntroGamePanel(){
    super();
    this.setOpaque(true);
    this.add(beginButton);
    this.setPreferredSize(new Dimension(800,600));
    beginButton.setPreferredSize(new Dimension(200,36));
    beginButton.setLocation(240,40);
    beginButton.addMouseMotionListener(this);
    beginButton.addMouseListener(this);
    beginButton.setEnabled(true);
}

@Override
//This will take us to the main menu screen.
public void mouseClicked(MouseEvent e) {    
    if(main != null){
        main.swapView(Main.mainMenuPanel);
    }

}

@Override
public void mouseEntered(MouseEvent e) {
    beginButton.setIcon(beginButtonIcon2);      
}

@Override
public void mouseExited(MouseEvent e) {
    beginButton.setIcon(beginButtonIcon1);
}

@Override
public void mousePressed(MouseEvent e) {
    //not needed
}

@Override
public void mouseReleased(MouseEvent e) {
    //not needed
}

@Override
public void mouseDragged(MouseEvent e) {
    //not needed
}

@Override
public void mouseMoved(MouseEvent e) {
    //not needed
}
public void getMain(Main main){
    this.main = main;
}
}

實際上，我迫切需要一些幫助。 :(

Answer 1

該錯誤來自該行

this.add(cards);

由於您將此布局更改為CardLayout ，因此必須將字符串指定為第二個參數。

你確定要Main有CardLayout嗎？ 您的面板cards已經包含這樣的布局。