java util NoSuchElementException No line found

Question

I got an run time exception in my program while I am reading a file through a Scanner     java util NoSuchElementException  No line found         at java util Scanner nextLine Unknown Source         at Day1 ReadFile read ReadFile java 49       at Day1 ParseTree main ParseTree java 17     My code is   while  str sc nextLine     null       i 0      if str equals  Locations                  size 4          t 3          str sc nextLine            str sc nextLine              if str equals  Professions                  size 3          t 2          str sc nextLine            str sc nextLine              if str equals  Individuals                  size 4          t 4          str sc nextLine            str sc nextLine           int j 0  String loc   new String size   while j lt size       beg 0      end str indexOf           if end  -1           tmp str substring beg  end           beg end 2            if end  -1                tmp str substring beg             if beg lt str length            str str substring beg       loc i  tmp      i         if i  size            if t  3                        location add loc                     if t  2                        profession add loc                     if t  4                        individual add loc                     i 0            j        System out print   n

User · Accepted Answer

with Scanner you need to check if there is a next line with hasNextLine    so the loop becomes  while sc hasNextLine         str sc nextLine                  it s readers that return null on EOF  ofcourse in this piece of code this is dependent on whether the input is properly formatted

User · Answer

Your real problem is that you are calling  quot sc nextLine   quot  MORE  TIMES than the number of lines  For example  if you have only TEN input lines  then you can ONLY call  quot sc nextLine   quot  TEN times  Every time you call  quot sc nextLine   quot   one input line will be consumed  If you call  quot sc nextLine   quot  MORE  TIMES than the number of lines  you will have an exception called        quot java util NoSuchElementException  No line found quot    If you have to call  quot sc nextLine   quot  n times  then you have to have at least n lines  Try to change your code to match the number of times you call  quot sc nextLine   quot  with the number of lines  and I guarantee that your problem will be solved

User · Answer

I also encounter with that problem   In my case the problem was that i closed the scanner inside one of the funcs     x000D   x000D  public class Main  x000D    x000D   public static void main String   args   x000D     x000D    Scanner menu   new Scanner System in   x000D          boolean exit   new Boolean false   x000D      while  exit   x000D    String choose   menu nextLine    x000D          Part1 t new Part1   x000D          t start    x000D       System out println  Noooooo Come back     choose   x000D      x000D   menu close    x000D     x000D    x000D   x000D  public class Part1 extends Thread  x000D    x000D  public void run   x000D       x000D       Scanner s   new Scanner System in   x000D       String st   s nextLine    x000D       System out print  bllaaaaaaa n  st   x000D       s close    x000D     x000D    x000D   x000D      x000D   x000D   x000D    The code above made the same exaption  the solution was to close the scanner only once at the main

User · Answer

Need to use top comment but also pay attention to nextLine    To eliminate this error only call  sc nextLine     Once from inside your while loop   while  sc hasNextLine     sc nextLine         You are using while to look ahead only 1 line  Then using sc nextLine   to read 2 lines ahead of the single line you asked the while loop to look ahead   Also change the multiple IF statements to IF  ELSE to avoid reading more than one line also

User · Answer

For whatever reason  the Scanner class also issues this same exception if it encounters special characters it cannot read  Beyond using the hasNextLine   method before each call to nextLine    make sure the correct encoding is passed to the Scanner constructor  e g    Scanner scanner   new Scanner new FileInputStream filePath    UTF-8

User · Answer

You re calling nextLine   and it s throwing an exception when there s no line  exactly as the javadoc describes  It will never return null  http   download oracle com javase 1 5 0 docs api java util Scanner html

[java] java.util.NoSuchElementException: No line found

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