java - 我的程序更改了 4 个字母单词中的一个字母，并将其与输入的其他内容进行切换，然后更新

Question

我是一名初学者程序员，正在尝试找出我的代码出了什么问题。我该如何改正我的错误？这是到目前为止我可以输入的代码。这与“Word Lader”游戏非常相似。我不断收到此错误，并且无法理解如何解决此问题:

OneLetterGame.java:67: error: incompatible types: possible lossy conversion from int to char:   charArray[0] = index ;

代码:

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


public class OneLetterGame {
 public static void main(String[] args) {
  String startWord = "";
  String currentWord = "";
  String goalWord = "";
  String error = "";
  char newLetter = '\0';
  int index = 0;
  int steps = 0;

     do {
   String[] fileContents = getFileContents("dictionary.txt");

   startWord = JOptionPane.showInputDialog(error + "Player One, please enter a FOUR letter word: ");

   if (startWord == null) {
    //exits program if user selects "cancel"
    System.exit(0);
   } //if

   currentWord = startWord;

   /* for(int i = 0; i < fileContents.length;i++){
    if(currentWord.equals(fileContents[i]){
        break;
    }else{
        error = "This is not a valid four letter word. Please try again. \n";
        continue;
    }   

}//for */

   System.out.println(startWord);

   goalWord = JOptionPane.showInputDialog("Player Two, please enter a FOUR letter GOAL word: ");

   if (goalWord == null) {
    //exits program if user selects "cancel"
    System.exit(0);
   } //if                                               

   steps++;

   //user enters step has form index space letter
   currentWord = JOptionPane.showInputDialog("Please enter the letter you want to change and its location (ex: 1 a) \n The Goal Word is " + goalWord + " :");

   if (currentWord == null) {
    //exits program if user selects "cancel"
    System.exit(0);
   } //if

   //pulls out character at index 0
   index = currentWord.charAt((int) 0 - 48);
   //pulls out character at index 3
   newLetter = currentWord.charAt(3);

   //string to char
   char[] charArray;
   charArray = currentWord.toCharArray();

   charArray[0] = index;
   charArray[3] = newLetter;
   currentWord = String.valueOf(charArray);

   //char to string
   currentWord = new String(charArray);

   System.out.println(currentWord);



   if (currentWord.equals(goalWord)) {
    if (steps % 2 == 0) {
     System.out.println("Congratulations to Player2. You won in " + steps + " step(s)!");
    } else {
     System.out.println("Congratulations to Player1. You won in " + steps + " step(s)!");
    }
    break;
   } else {
    continue;
   }
  } while (true);

 } //main

 public static String[] getFileContents(String fileName) {

  String[] contents = null;
  int length = 0;
  int num = 0;
  try {
   // input
   String folderName = "/subFolder/"; // if the file is contained in the same folder as the .class file, make this equal to the empty string
   String resource = fileName;

   // this is the path within the jar file
   InputStream input = OneLetterGame.class.getResourceAsStream(folderName + resource);
   if (input == null) {
    // this is how we load file within editor (eg eclipse)
    input = OneLetterGame.class.getClassLoader().getResourceAsStream(resource);
   }
   BufferedReader in = new BufferedReader(new InputStreamReader(input));



   in .mark(Short.MAX_VALUE); // see api

   // count number of lines in file
   while ( in .readLine() != null) {
    length++;
   }

   in .reset(); // rewind the reader to the start of file
   contents = new String[length]; // give size to contents array

   // read in contents of file and print to screen
   for (int i = 0; i < length; i++) {
    contents[i] = in .readLine();
   } in .close();
  } catch (Exception e) {
   System.out.println("File Input Error");
  }

  return contents;

 } // getFileContents
}//onelettergame

Answer 1

您需要正确使用 --> charArray[0] = (char) index;

尽管如果您在某些 IDE 中执行此操作，则编译错误将显示类似以下内容 --> 类型不匹配:无法从 int 转换为 char