3

我的代码有困难CardLayout Manager。我不知道为什么我会得到这个异常。我在CardLayout.show()方法中传递了一个字符串，但我仍然收到此错误。请帮忙。这是我的主要课程。

@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();
        }
    });
}

这是我正在交换卡的外部课程。

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;
}
}

实际上，我非常迫切地需要一些帮助。:(

4

1 回答 1

6

错误来自行

this.add(cards);

由于您将其布局更改为 aCardLayout您必须指定一个字符串作为第二个参数。

你确定你想要Main一个CardLayout吗？您的面板cards已经包含这样的布局。

于 2011-12-03T13:24:15.327 回答