java - 当程序尝试写入文件时出现错误？

Question

问题是我写入文件的部分。每次我完成为控制台中的字符串赋值时，它都会给我一个错误，如下所示:

Exception in thread "main" java.lang.IllegalStateException: Scanner closed
at java,util,Scanner,ensureOpen(Unknown Source)
at java,util,Scanner,findWithinHorizon(Unknown Source)
at java,util,Scanner,hasNextLine(Unknown Source)
at mainPackage,MainClass,main(MainClass.java:71)

这是我的代码:

package mainPackage;

import java.util.Scanner;
import java.util.concurrent.ThreadLocalRandom;
import java.util.ArrayList;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.BufferedWriter;

public class MainClass {

   private static FileWriter fw;
   private static BufferedWriter out;
   private static Scanner input;
   private static Scanner file;
   private static FileWriter fw2;
   private static BufferedWriter out2;
   private static Scanner file2;
   private static ArrayList<String> questList;
   private static ArrayList<String> ansList;

   public static void main(String[] args) throws IOException  , IllegalStateException{

      fw = new FileWriter("C:/Users/ALAN_BARE/Desktop/Dictionary.txt" , true );
      input = new Scanner(System.in);
      file = new Scanner(new File("C:/Users/ALAN_BARE/Desktop/Dictionary.txt"));
      out = new BufferedWriter(fw);
      fw2 = new FileWriter("C:/Users/ALAN_BARE/Desktop/Dictionary2.txt" , true);
      out2 = new BufferedWriter(fw2);
      file2 = new Scanner(new File("C:/Users/ALAN_BARE/Desktop/Dictionary2.txt"));
      questList = new ArrayList<String>();
      ansList = new ArrayList<String>();

      String engword;
      String gerword;
      String response;
      int counter = 0;

      //Loading the file data to the arraylist
      while (file.hasNextLine()) {
         questList.add(file.nextLine());
         ansList.add(file2.nextLine());
      }

      file.close();
      file2.close();

      System.out.println("What do you want to do, register words or Play the game?");
      response = input.nextLine();

      //Getting the values of the strings via user input
      if (response.contains("register")) {

         System.out.println("Type yor english word:");
         engword = input.nextLine();
         System.out.println("Type the translation in German:");
         gerword = input.nextLine();

         //writing it to a file
         if (file.hasNextLine()) {
             out.newLine();
             out.write(engword);
         }
         else {
             out.write(engword);
         }

         if (file2.hasNextLine()) {
             out2.newLine();
             out2.write(gerword);
         }
         else {
             out2.write(gerword);
         }
      }

      //The same, just for a different response
      else if (response.contains("Register")) {
         System.out.println("Type yor english word:");
         engword = input.next();
         System.out.println("Type the translation in German:");
         gerword = input.next();

         if (file.hasNextLine()) {
            out.newLine();
            out.write(engword);
         }
         else {
            out.write(engword);
         }

         if (file2.hasNextLine()) {
             out2.newLine();
             out2.write(gerword);
         }
         else {
             out2.write(gerword);
         }
      }

      out.close();
      out2.close();

      //Running the quiz game
      if (response.contains("play")) {

          while (counter <= 10 ) {
              counter++;
              int sel = ThreadLocalRandom.current().nextInt(0, questList.size() + 1);

              System.out.println("The english word is :" + questList.get(sel));
              System.out.println("Please type the translation in German:");
              String answer = input.nextLine();

              if (answer.contains(ansList.get(sel))) {
                  System.out.println("Correct!");
              }
              else {
                  System.out.println("Wrong! You Lose! If you want to play again, restart the app.");
                  break;
              }
          }   
      }   

      while (counter == 10) {
          System.out.println("You Win The Game! If you want to play again, restart the app.");
          counter++;
      }   
   }
}

可能是什么问题？

Answer 1

在第 56 行关闭名为 file 的 Scanner 对象后出现错误是正常的

file.close()

您得到的错误清楚地解决了问题。

Scanner closed