我试图在switch语句中的if语句中更改if语句中使用的int的值但是我不知道如何在不创建变量的新实例的情况下更改值。
问题所在的类是在主类中，代码需要其余类，但是相关的类。然而，当用户在gui命令框中输入数字时，FramePanel类会初始化decisionChooser方法。
以下是我的完整代码。在主类下面，您将找到有问题的if和switch语句：
主类：
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");
}
}
FramePanel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 Class：
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 Class（由于字符串数量而缩短）：
public class StoryArray
{
public static String storyLine[] = null ;
public static String[] getStoryLine()
{
return storyLine;
}
public static void main()
{
//String[] storyLine;
storyLine = new String[399];
storyLine[0] = ("test1");
storyLine[1] = ("test2");
storyLine[2] = ("test 3");
storyLine[18] = ("test4");
storyLine[69] = ("Test5");
storyLine[70] = ("Test6");
storyLine[71] = ("Test7");
storyLine[73] = ("Test8");
}
}
答案 0 :(得分：0)
我意识到将变量设为public并不会使它成为类变量。这意味着每次运行循环时，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，它都会更改循环也是如此。
这是我必须声明的方式：
public static int textNumber;