[解決済み】配列は必要だが、java.lang.Stringが見つかった

質問

テキストファイルのリストから取得したランダムな単語を隠そうとしているのですが、コードは次のようなエラーを出し続けています。 Array Required, but java.lang.String found

import java.awt.*;
import java.awt.event.*;
import java.util.Arrays;
import javax.swing.*;
import java.io.*;
import java.util.ArrayList;
import java.util.Random;
import java.util.List;

public class Hangman extends JFrame
{
private static final char HIDECHAR = '_';
String imageName = null;
String Path = "D:\\Varsity College\\Prog212Assign1_10-013803\\images\\";
static int guesses =0;
private String original = readWord();
private String hidden;
int i = 0;
static JPanel panel;
static JPanel panel2;
static JPanel panel3;
static JPanel panel4;

public Hangman(){
JButton[] buttons = new JButton[26];

this.original = original;
this.hidden = this.createHidden();
panel = new JPanel(new GridLayout(0,9));
panel2 = new JPanel();
panel3 = new JPanel();
panel4 = new JPanel();

JButton btnRestart = new JButton("Restart");
btnRestart.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e)
    {

    }
});

JButton btnNewWord = new JButton("Add New Word");
btnNewWord.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e)
{
try
{
    FileWriter fw = new FileWriter("Words.txt", true);
    PrintWriter pw = new PrintWriter(fw, true);

    String word = JOptionPane.showInputDialog("Please enter a word: ");

    pw.println(word);
    pw.close();
}
catch(IOException ie)
{
    System.out.println("Error Thrown" + ie.getMessage());
}
}
});

JButton btnHelp = new JButton("Help");
btnHelp.addActionListener(new ActionListener(){
   public void actionPerformed(ActionEvent e)
   {
       String message = "The word to guess is represented by a row of dashes, giving the number of letters and category of the word."
               + "\nIf the guessing player suggests a letter which occurs in the word, the other player writes it in all its correct positions."
               + "\nIf the suggested letter does not occur in the word, the other player draws one element of the hangman diagram as a tally mark."
               + "\n"
               + "\nThe game is over when:"
               + "\nThe guessing player completes the word, or guesses the whole word correctly"
               + "\nThe other player completes the diagram";
       JOptionPane.showMessageDialog(null,message, "Help",JOptionPane.INFORMATION_MESSAGE);
   }
});

JButton btnExit = new JButton("Exit");
btnExit.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e)
    {
        System.exit(0);
    }
});
JLabel lblWord = new JLabel(original);

if(guesses >= 0) imageName = "Hangman1.jpg";
if(guesses >= 1) imageName = "Hangman2.jpg";
if(guesses >= 2) imageName = "Hangman3.jpg";
if(guesses >= 3) imageName = "Hangman4.jpg";
if(guesses >= 4) imageName = "Hangman5.jpg";
if(guesses >= 5) imageName = "Hangman6.jpg";
if(guesses >= 6) imageName = "Hangman7.jpg";
ImageIcon icon = null;
if(imageName != null){
    icon = new ImageIcon(Path + File.separator + imageName);
}

JLabel label = new JLabel();
label.setIcon(icon);
String  b[]={"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};
for(i = 0; i < buttons.length; i++)
{
    buttons[i] = new JButton(b[i]);

    panel.add(buttons[i]);
}

panel2.add(label);

panel3.add(btnRestart);
panel3.add(btnNewWord);
panel3.add(btnHelp);
panel3.add(btnExit);
panel4.add(lblWord);
}
public String readWord()
{
try
{
BufferedReader reader = new BufferedReader(new FileReader("Words.txt"));
String line = reader.readLine();
List<String> words = new ArrayList<String>();
while(line != null)
{
    String[] wordsLine = line.split(" ");
    boolean addAll = words.addAll(Arrays.asList(wordsLine));
    line = reader.readLine();
}
Random rand = new Random(System.currentTimeMillis());
String randomWord = words.get(rand.nextInt(words.size()));
return randomWord;

}catch (Exception e){
    return null;
}

}
private String printWord(){
StringBuilder sb = new StringBuilder();
for (int i = 0; i < this.original.length(); i++){
    sb.append(HIDECHAR);
}
return sb.toString();
}
public boolean check(char input){
boolean found = false;
for (int i = 0; i < this.original.length(); i++){
    if(this.original.charAt(i)== input)){
        found = true;
        this.hidden[i] = this.original.charAt(i);
    }
}
return found;
}

public static void main(String[] args) 
{

    System.out.println();
    Hangman frame = new Hangman();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Box mainPanel = Box.createVerticalBox();
    frame.setContentPane(mainPanel);
    mainPanel.add(panel, BorderLayout.NORTH);
    mainPanel.add(panel2);
    mainPanel.add(panel4);
    mainPanel.add(panel3);
    frame.pack();
    frame.setVisible(true);
}

}

さて、これがコード全体です< エラーは現在151行目と149行目にあります...。私はまた、ある投稿に従ってそれを修正しようとしました。

解決方法は？

配列の添え字が使えない。 [] へのインデックスを作成するために String と、両方の hidden と original は Strings .

代わりに original.charAt(i) から 読む インデックスで文字を指定します。

については ライティング インデックスで1文字: java Strings は immutable なので、個々の文字を変更することはできません。代わりに hidden a StringBuilder または、単に char[] :

// in your class member declarations:
char hidden[] = createHidden();

// possible implementation of createHidden:
char[] createHidden()
{
    if (original != null)
        return new char[original.length()];
    else return null;
}

そして、ループは original.charAt というように

if (this.original.charAt(i) == input)
{
    found = true;
    this.hidden[i] = this.original.charAt(i);