抱歉的代码转储，但我不知道是哪里造成的问题。当我点击循环按钮的时候，它应该带我到循环页面（它是这样做的），但是我应该可以点击开始和中间的面板，蓝色的应该是黄色的动画面板，黄色的。当我运行这个程序时，我只看到黄色的动画面板，当我单击开始时，我得到一个“exception in thread”awt-eventqueue-0“java.lang.illegalargumentexception:wrong parent for cardlayout”错误。

/**
     * @description:scheduling algoritmn visualisation app
     * @version: 1.0
     * @date created: 22/11/2020
     */

    import javax.swing.*;
    import javax.swing.border.EmptyBorder;
    import java.awt.*;
    import java.awt.event.*;
    import java.awt.image.*;
    import java.io.*;
    import javax.imageio.ImageIO;
    import java.net.*; 

    public class SchedulingAlgorithms extends JFrame{
        CardLayout cl;
        JPanel contentPane;
        Container deckPanel;
        Image image;

        /**
         * Constructor for objects of class SchedulingAlgorithms
         */
        public SchedulingAlgorithms(){
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setBounds(100, 100, 658, 336);
            contentPane = new JPanel();
            contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
            setContentPane(contentPane);
            contentPane.setLayout(null);

            JPanel headerPanel = new JPanel();
            JLabel label = new JLabel();
            headerPanel.setBackground(Color.LIGHT_GRAY);
            headerPanel.setBounds(5, 5, 125, 106);
            contentPane.add(headerPanel);

            try{
                URL url = new URL("file:C:///Users//alyssa//Scheduling_Animations//icon.png");        
                image=ImageIO.read(url);
                headerPanel.add(new JLabel(new ImageIcon(image)));
            }catch (IOException e) {
                e.printStackTrace();
            } 

            JPanel btnPanel = new JPanel();
            btnPanel.setBackground(Color.LIGHT_GRAY);
            btnPanel.setBounds(5, 111, 125, 181);
            contentPane.add(btnPanel);
            btnPanel.setLayout(null);
            cl= new CardLayout();

            JPanel deckPanel = new JPanel();
            deckPanel.setBounds(140, 5, 492, 287);
            contentPane.add(deckPanel);
            deckPanel.setLayout(cl);

            JPanel home = new JPanel();
            deckPanel.add(home, "home");

            JPanel homePic = new JPanel(new GridLayout(2,1));
            home.add(homePic, "homePic");

            JLabel instructions1 = new JLabel();
            instructions1.setText("Select a scheduling algorithm to see it's visual representation");
            homePic.add(instructions1);

            try{
                URL url = new URL("file:C:///Users//alyssa//Scheduling_Animations//schedule.png");        
                image=ImageIO.read(url);
                homePic.add(new JLabel(new ImageIcon(image)));
            }catch (IOException e) {
                e.printStackTrace();
            }                
            JPanel card1 = new JPanel();
            deckPanel.add(card1, "rr");
            card1.setLayout(new BorderLayout());

            JLabel txt2= new JLabel();
            txt2.setText("Round Robin: Set the boundaries of the animation");
            card1.add(txt2);

            JPanel card2 = new JPanel();
            deckPanel.add(card2, "fcfs");

            JTextArea txt3 = new JTextArea();
            txt3.setText("First-Come-First-Served");
            card2.add(txt3);

            JPanel card3 = new JPanel();
            deckPanel.add(card3, "sjf");

            JTextArea txt4 = new JTextArea();
            txt4.setText("Shortest Job First");
            card3.add(txt4);

            JPanel card4 = new JPanel();
            deckPanel.add(card4, "ps");

            JTextArea txt5 = new JTextArea();
            txt5.setText("Priority Scheduling");
            card4.add(txt5);

            JButton btn0 = new JButton("Home");
            btn0.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    if(e.getActionCommand()=="Home")
                    cl.show(deckPanel, "home");
                }
            });
            btn0.setBounds(10, 11, 89, 23);
            btnPanel.add(btn0);

            JButton btn1 = new JButton("Round Robin");
            btn1.setBounds(10, 45, 89, 23);
            btnPanel.add(btn1);

            btn1.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {                
                    if(e.getActionCommand()=="Round Robin")
                    cl.show(deckPanel, "rr");
                }
            });

            JButton btn2 = new JButton("First-Come-First-Served");
            btn2.setBounds(10, 79, 89, 23);
            btnPanel.add(btn2);

            btn2.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {                
                    if(e.getActionCommand()=="First-Come-First-Served")
                    cl.show(deckPanel, "fcfs");
                }
            });

            JButton btn3 = new JButton("Shortest Job First");
            btn3.setBounds(10, 113, 89, 23);
            btnPanel.add(btn3);

            btn3.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {                
                    if(e.getActionCommand()=="Shortest Job First")
                    cl.show(deckPanel, "sjf");
                }
            });

            JButton btn4 = new JButton("Priority Scheduling");
            btn4.setBounds(10, 147, 89, 23);
            btnPanel.add(btn4);

            btn4.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {                
                    if(e.getActionCommand()=="Priority Scheduling")
                    cl.show(deckPanel, "ps");
                }
            });

           JPanel northPanel=new JPanel();
           card1.add(northPanel,BorderLayout.NORTH);

           JLabel heading=new JLabel();
           heading.setText("Round Robin.");
           northPanel.add(heading);
           JLabel instructions2= new JLabel();
           instructions2.setText("Set the boundaries of the animation");          
           northPanel.add(instructions2);

           JPanel centerPanel=new JPanel();
           centerPanel.setBackground(Color.blue);
           card1.add(centerPanel,BorderLayout.CENTER);
           centerPanel.setLayout(new CardLayout());

           JPanel animPanel=new JPanel();
           animPanel.setBackground(Color.yellow);
           centerPanel.add(animPanel,"anim");

           JPanel southPanel=new JPanel();
           card1.add(southPanel,BorderLayout.SOUTH);

           JButton start = new JButton("START");
           start.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent e) {
                   if(e.getActionCommand()=="START")
                   cl.show(centerPanel, "anim");
               }
           });
           start.setBounds(311, 159, 65, 23);
           southPanel.add(start);           

        }

       public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
            try {
                SchedulingAlgorithms frame = new SchedulingAlgorithms();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
            }
        });
       }
}