Java 不能在case switch语句中更改if语句

我试图从switch语句中的if语句内部更改if语句中使用的int的值，但是如果不创建变量的新实例，我无法确定如何更改该值

问题所在的类位于主类中，其余的类是代码所需的，但与此相关。但是，当用户在gui命令框中输入数字时，FramePanel类初始化decisionChooser方法

下面是我的完整代码。在main类下，您可以找到有问题的if和switch语句：

主要类别：

public class Main
{
    public static void main(String[] args)
    {
        FramePanel.runLater();
        StoryArray.main();
    }

    public int a1;
    public int a2;
    public int a3;
    public int a4;
    public int a5;
    public int textNumber;
    public String chosenText;


    public void decisionChooser()
    {
        String inputText = FramePanel.commandsField.getText();
        FramePanel.commandsField.setText(null);
        try
        {
            textNumber = Integer.parseInt(inputText);
            textNumber = textNumber - 1;

            if (textNumber == a1 || textNumber == a2 || textNumber == a3 || textNumber == a4 || textNumber == a5)
            {
                System.out.println(textNumber + " in If");

                System.out.println("Entering switch");
                switch (textNumber)
                {
                    case 0:
                        a1 = 70; // this will change a1 for in the if statement
                        chosenText = StoryArray.storyLine[textNumber];
                        FramePanel.currentTextArea.append(chosenText + "\n");
                        break;

                    case 70:
                        a1 = 281;
                        chosenText = StoryArray.storyLine[textNumber];
                        FramePanel.currentTextArea.append(chosenText + "\n");
                        break;

                    default:
                        break;
                }
            }
            else
            {
                FramePanel.currentTextArea.append("\nPlease choose a valid page number!\n");
            }
            System.out.println("Out of If statement");
        }
        catch (NumberFormatException NFE)
        {
            FramePanel.currentTextArea.append("Please Enter the Page number" + "\n");
        }
        System.out.println("looped");
    }
}

框架面板类：

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.util.Random;
import javax.swing.*;

@SuppressWarnings("serial")
public class FramePanel extends JPanel
{
    /////Setting Positioning/////

    // rows and cols for jtextarea
    private static final int CURRENT_AREA_ROWS = 20;
    private static final int CURRENT_AREA_COLS = 40;

    // columns for command jtextfied
    private static final int COMMANDS_FIELD_COLS = 50;

    // size of GUI component gaps
    private static final int EB_GAP = 1;

    private String inventoryString()
    {
        return ("Inventory:" +
                "\n- " +
                "\n- " +
                "\n- " +
                "\n- " +
                "\n- " +
                "\n- " +
                "\n- " +
                "\n- " +
                "\n- " +
                "\n- ");
    }

    private String startString()
    {
        return ("Welcome to Warlock of Firetop Mountain! This game was coded by Thomas Thorburn and the story line was written by Ian Livingstone and Steve Jackson. To get started, click 'New Game' or load a save. If you get stuck click the 'Help' button or read the 'Help and Information' document.\n\nLet the Adventure Begin!");
    }
    private EnterAction enterAction = new EnterAction("Enter");

    public static JTextArea currentTextArea = new JTextArea(CURRENT_AREA_ROWS, CURRENT_AREA_COLS);
    public static JTextField commandsField = new JTextField(COMMANDS_FIELD_COLS);
    public static JTextArea inventoryTextArea = new JTextArea(CURRENT_AREA_ROWS, CURRENT_AREA_COLS);



    public FramePanel()
    {

        JPanel topBtnPanel = new JPanel(new GridLayout(1, 0));
        {
            topBtnPanel.add(new JButton(new HelpAction("Help", KeyEvent.VK_X)));
            topBtnPanel.add(new JButton(new RollAction("Roll Dice", KeyEvent.VK_X)));
            topBtnPanel.add(new JButton(new NewGameAction("New Game", KeyEvent.VK_X)));
            topBtnPanel.add(new JButton(new SaveAction("Save", KeyEvent.VK_X)));
            topBtnPanel.add(new JButton(new LoadAction("Load", KeyEvent.VK_X)));
        }

        JPanel characteristicsPanel = new JPanel(new GridBagLayout());
        {
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.anchor = GridBagConstraints.WEST;
            gbc.fill = GridBagConstraints.HORIZONTAL;
            gbc.gridx = 1;
            gbc.gridy = 0;
            characteristicsPanel.add(new JTextField("20"), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JTextField("20"), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JTextField("20"), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JTextField("20"), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JTextField("20"), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JTextField("20"), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JTextField("20"), gbc);
            gbc.gridy ++;

            gbc.anchor = GridBagConstraints.EAST;
            gbc.gridx = 0;
            gbc.gridy = 0;
            characteristicsPanel.add(new JLabel("SKILL:  "), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JLabel("STAMINA:  "), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JLabel("LUCK:  "), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JLabel("GOLD:  "), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JLabel("JEWELS:  "), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JLabel("POTIONS:  "), gbc);
            gbc.gridy ++;
            characteristicsPanel.add(new JLabel("PREVISIONS:  "), gbc);
            gbc.gridy ++;
        }

        inventoryTextArea.setWrapStyleWord(true);
        inventoryTextArea.setLineWrap(true);
        inventoryTextArea.setEditable(true);
        inventoryTextArea.append(inventoryString());
        JScrollPane imgListPane = new JScrollPane(inventoryTextArea);
        imgListPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

        JPanel rightPanel = new JPanel(new BorderLayout(EB_GAP, EB_GAP));
        rightPanel.add(topBtnPanel, BorderLayout.PAGE_START);
        rightPanel.add(imgListPane, BorderLayout.CENTER);
        rightPanel.add(characteristicsPanel, BorderLayout.LINE_END);

        currentTextArea.setWrapStyleWord(true);
        currentTextArea.setLineWrap(true);
        currentTextArea.setFocusable(false);
        currentTextArea.append(startString());
        JScrollPane taScrollPane = new JScrollPane(currentTextArea);
        taScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

        JPanel centerPanel = new JPanel(new BorderLayout());
        centerPanel.add(taScrollPane, BorderLayout.CENTER);
        centerPanel.add(rightPanel, BorderLayout.LINE_END);

        JPanel commandsPanel = new JPanel();
        commandsPanel.setLayout(new BoxLayout(commandsPanel, BoxLayout.LINE_AXIS));
        commandsPanel.add(commandsField);
        commandsPanel.add(Box.createHorizontalStrut(EB_GAP));
        commandsPanel.add(new JButton(enterAction));
        commandsPanel.add(Box.createHorizontalStrut(EB_GAP));
        commandsField.setAction(enterAction); // use same action for button and


        setBorder(BorderFactory.createEmptyBorder(EB_GAP, EB_GAP, EB_GAP, EB_GAP));
        setLayout(new BorderLayout(EB_GAP, EB_GAP));
        add(centerPanel, BorderLayout.CENTER);
        add(commandsPanel, BorderLayout.PAGE_END);
    }


    /////////Buttons/////////
    //Enter Button Action
    private class EnterAction extends AbstractAction
    {
        public EnterAction(String name)
        {
            super(name);
        }

        @Override
        public void actionPerformed(ActionEvent e)
        {
            Main mainChoices = new Main();//Allowing me to call Main
            mainChoices.decisionChooser();//Calling up decisionChooser method
        }
    }

    //Help Action
    private class HelpAction extends AbstractAction
    {
        public HelpAction (String name, int mnemonic)
        {
            super(name);
            putValue(MNEMONIC_KEY, mnemonic);
        }

        @Override
        public void actionPerformed(ActionEvent e)
        {
            currentTextArea.append("\n\n" + "Welcome to Warlock of Firetop Mountain! To navigate the story line just enter the relevant page number in the text box below, To make this game as authentic as possiable to the original game, all combat stats and inventory are controlled by the user. \n\nTo Save, Load or start a New Game, use the corresponding buttons in the top right of the window. To roll the dice you also click the 'Roll Dice' button. This will print the two dice rolls in your storyline box. For more information, please refer to the help and information guide provided with this program." + "\n \n");
        }
    }

    //New Game Button and Action
    private class NewGameAction extends AbstractAction
    {
        public NewGameAction (String name, int mnemonic)
        {
            super(name);
            putValue(MNEMONIC_KEY, mnemonic);
        }

        @Override
        public void actionPerformed(ActionEvent e)
        {
            currentTextArea.setText(startString());
        }
    }

    //Load Button and Action
    private class LoadAction extends AbstractAction
    {
        public LoadAction (String name, int mnemonic)
        {
            super(name);
            putValue(MNEMONIC_KEY, mnemonic);
        }

        @Override
        public void actionPerformed(ActionEvent e)
        {
            OpenFile of = new OpenFile();

            try
            {
                of.PickMe();
            }
            catch (Exception e1)
            {
                e1.printStackTrace();
            }
            currentTextArea.setText(of.sb.toString());
        }
    }

    //Save Button and Action
    private class SaveAction extends AbstractAction
    {
        public SaveAction (String name, int mnemonic)
        {
            super(name);
            putValue(MNEMONIC_KEY, mnemonic);
        }

        @Override
        public void actionPerformed(ActionEvent e)
        {
            System.out.print("yo3");
        }
    }

    //Exit Button and Action
    private class ExitAction extends AbstractAction
    {
        public ExitAction(String name, int mnemonic)
        {
            super(name);
            putValue(MNEMONIC_KEY, mnemonic);
        }

        @Override
        public void actionPerformed(ActionEvent e)
        {
            Component source = (Component) e.getSource();
            Window win = SwingUtilities.getWindowAncestor(source);
            win.dispose();
        }
    }

    //Roll Button Action
    private class RollAction extends AbstractAction
    {
        public RollAction(String name, int mnemonic)
        {
            super(name);
            putValue(MNEMONIC_KEY, mnemonic);
        }

        @Override
        public void actionPerformed(ActionEvent e)
        {
            Random r = new Random();

            int diceRoll1=r.nextInt(6); //Generates random number
            int diceRoll2=r.nextInt(6);


            diceRoll1 = diceRoll1 + 1; //Changes range from 0-5 to 1-6
            diceRoll2 = diceRoll2 + 1;

            currentTextArea.append("You have rolled a " + diceRoll1 + " and a " + diceRoll2 + "!" + "\n");
        }
    }


    /////////GUI Setup/////////
    //Making and choosing settings for frame.
    private static void createAndShowGUI()
    {
        FramePanel mainPanel = new FramePanel();

        JFrame frame = new JFrame("Warlock of Firetop Mountain");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(true);
        frame.setLocationRelativeTo(null);
        frame.getContentPane().add(mainPanel);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }


    /////////Getters and Setters/////////
    //Getter for currentTextArea
    public static JTextArea getTextArea()
    {
        return currentTextArea;
    }


    /////////Run Later/////////
    public static void runLater()
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
    }
}

OpenFile类：

import javax.swing.*;
import java.util.Scanner;

public class OpenFile
{
    JFileChooser loadFile = new JFileChooser();
    StringBuilder sb = new StringBuilder();

    public void PickMe() throws Exception
    {
        if(loadFile.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
        {
            java.io.File file = loadFile.getSelectedFile();


            Scanner input = new Scanner(file);

            while (input.hasNext())
            {
                sb.append(input.nextLine());
                sb.append("\n\n");
            }
            input.close();

        }
        else
        {
            sb.append("\n\n" + "No File Selected! \n\n");

        }
    }
}

StoryArray类（因字符串数量而缩短）：

---

我意识到公开变量并不能使其成为类变量。这意味着每次我运行循环时，它都会创建一个新的变量实例。要更改它并使其成为类变量，我必须将其声明为静态，这意味着只能有一个实例，因此每次运行循环并更改switch语句中的值时，它也会更改循环外部的值

我必须这样声明：

public static int textNumber;

---

您试图更改哪个变量？请描述代码的预期行为以及正在发生的情况。哦，很抱歉，我没有意识到id在测试时意外删除了某些内容。我将快速编辑代码，我希望在0:70的情况下有一个语句，它将更改a1、2、3的值，4或5表示下一次使用if语句run@TomT你无权反复删除/打开同一个问题。上一篇：抱歉，我删除了它，以一个结构更好的问题重新开始，因为最后一篇引起了混乱，通过重新开始，我可以确保我包含了所需的内容

public static int textNumber;