Actually, the code itself. First you need to count the number of lines in the code, then put them into the array:

package com.company; import java.util.Scanner; import java.io.File; public class Main { public static void main(String[] args) throws Exception { File file = new File("фильмы.txt"); Scanner scanFile = new Scanner(file); int count = 0; while (scanFile.hasNextLine()) { scanFile.nextLine(); count++; System.out.println(count); } String slova[] = new String[count]; for (int i = 0;i < slova.length;i++){ slova[i] = scanFile.nextLine(); System.out.println(slova[i]); } } }

At startup, it displays the following:

 1 Exception in thread "main" java.util.NoSuchElementException: No line found 2 3 at java.util.Scanner.nextLine(Scanner.java:1540) 4 5 at com.company.Main.main(Main.java:21) 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Process finished with exit code 1

I rewrote the code using 2 scanners:

 import java.util.Scanner; import java.io.File; public class Main { public static void main(String[] args) throws Exception { File file = new File("фильмы.txt"); Scanner scanFile = new Scanner(file); int count = 0; while (scanFile.hasNextLine()) { scanFile.nextLine(); count++; System.out.println(count); } scanFile.close(); String slova[] = new String[count]; Scanner scanFile2 = new Scanner(file); for (int i = 0;i < slova.length;i++){ slova[i] = scanFile2.nextLine(); System.out.println(slova[i]); } scanFile2.close(); } }

And now everything works as it should:

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 the shawshank redemption the godfather the dark knight schindler's list pulp fiction the lord of the rings the good the bad and the ugly fight club the lord of the rings forrest gump star wars inception the lord of the rings the matrix samurai star wars city of god the silence of the lambs batman begins die hard chinatown room dunkirk fargo no country for old men Process finished with exit code 0

Actually, I wonder what the problem is in the first version of the code? Why didn’t it work using one scanner for two cycles?

  • 6
    You have read 25 lines of the file, then you request the 26th line and receive a message that it does not exist. - Maxim
  • @Maxim, thanks, now it’s clear. And you can change the code in some way, so that everything would work using the same scanner? I tried to apply the remove () and reset () methods to the scanner, the problem remained the same - Zebsier
  • 2
    @Zebsier Why do you even need to read the same file twice? If you are reading for the first time just for the sake of determining the number of lines to create then an array of the desired size, then maybe just use a list instead of an array? The current solution looks painfully inefficient, if everything is exactly like that ... - Regent
  • @Regent within this task cannot use the list, it must be done through scanners and arrays, so you have to read the file twice, I just wonder why using the same scanner twice, the program does not work correctly, and when using 2 scanners everything works like Needed - Zebsier
  • one
    @Zebsier Scanner cannot be restarted, so if you want to read a file twice, you will have to create two scanners. As for "no lists can be used" - well, but using only arrays you can do without two readings: just write a mini-implementation of ArrayList . That is, create an array on X (selected constant) elements. If the array is full at the next reading of the string, create a larger array (for example, twice), copy the values ​​from the old one into it and continue the loop. Here is what is needed by those who check the task ... - Regent

0