Read line with Scanner

Question

EDIT for further readers  the problem was that my input file was corrupted   I don t understand what I m doing wrong    I was using this code        File f   new File  C   Temp  dico txt        BufferedReader r   null      try           r   new BufferedReader new FileReader f            String scan          while  scan r readLine     null                if scan length    0   continue                 treatment                 catch  FileNotFoundException ex            Logger getLogger Lexique class getName    log Level SEVERE  null  ex         catch  IOException ex            Logger getLogger Lexique class getName    log Level SEVERE  null  ex         finally           if r  null  try               r close              catch  IOException ex                Logger getLogger Lexique class getName    log Level SEVERE  null  ex                     Which is working fine  Now  for some reason  I wanted to change for a Scanner  My code became        File f   new File  C   Temp  dico txt        Scanner r   null      try           r   new Scanner f           String scan          while r hasNextLine                  scan   r nextLine                if scan length    0   continue                 treatment                 catch  FileNotFoundException ex            Logger getLogger Lexique class getName    log Level SEVERE  null  ex         catch  IOException ex            Logger getLogger Lexique class getName    log Level SEVERE  null  ex         finally           if r  null  r close            This time  we never enter the while  because r hasNextLine   always returns  false   Any idea about what I m doing wrong    I precise that nothing else changed  the file is still the same   EDIT   I also precise that I tried with another file and got the same result  meaning it doesn t comes from the file apparently   The file looks like this    a    abaissa abaissable abaissables abaissai abaissaient abaissais abaissait       Edit 2   The content of the file seems to be problematic since the problem persists only if I copy paste the content from my file to another  In clear  if I write the content myself  it works  if I use a part of the content of my dico txt file  it doesn t work  Any explanation    Edit 3   These are the links to my files  I advice you to avoid the dico txt which is very huge   dico txt   https   drive google com file d 0B0sroFy9HZlBNDl3MUwzVnh6VU0 edit usp sharing  test txt   https   drive google com file d 0B0sroFy9HZlBemZjbXU1RmlmdjQ edit usp sharing

User · Answer

next   and nextLine   methods are associated with Scanner and is used for getting String inputs  Their differences are     next   can read the input only till the space  It can t read two words separated by space  Also  next   places the cursor in the same line after reading the input   nextLine   reads input including space between the words  that is  it reads till the end of line  n   Once the input is read  nextLine   positions the cursor in the next line   Read article  Difference between next   and nextLine    Replace your while loop with    while r hasNext                      scan   r next                    System out println scan                   if scan length    0   continue                     treatment                 Using hasNext   and next   methods will resolve the issue

User · Answer

Try to use r hasNext   instead of r hasNextLine     while r hasNext              scan   r next

User · Answer

For everybody who still can t read in a simple  txt file with the Java scanner     I had the problem that the scanner couldn t read in the next line  when I Copy and Pasted the information  or when there was to much text in my file   The solution is  Coder your  txt file into UTF-8  This can be done fairly simple by saving opening the file again and changing the coding to UTF-8   Under Win7 near the bottom right corner   The Scanner shouldn t have any problem after this

User · Answer

To change this license header  choose License Headers in Project Properties     To change this template file  choose Tools   Templates    and open the template in the editor      package javaapplication1   import java io File  import java util Scanner              author zsagga     class openFile           private Scanner x            int count   0            String path    C   Users  zsagga  Documents  NetBeansProjects  JavaApplication1  src  javaapplication1  Readthis txt          public void openFile                       System out println  I m Here            try               x   new Scanner new File path                         catch  Exception e                System out println  Could not find a file                         public void readFile              while  x hasNextLine                 count                  x nextLine                           System out println count              public void closeFile             x close                   To change this license header  choose License Headers in Project Properties     To change this template file  choose Tools   Templates    and open the template in the editor      package javaapplication1              author zsagga     public class JavaApplication1        public static void main String   args               TODO code application logic here         openFile r    new openFile             r openFile             r readFile            r closeFile

User · Answer

This code reads the file line by line   public static void readFileByLine String fileName      try      File file   new File fileName      Scanner scanner   new Scanner file      while  scanner hasNext          System out println scanner next             scanner close        catch  FileNotFoundException e       e printStackTrace              You can also set a delimiter as a line separator and then perform the same    scanner useDelimiter System getProperty  line separator       You have to check whether there is a next token available and then read the next token  You will also need to doublecheck the input given to the Scanner  i e  dico txt  By default  Scanner breaks its input based on whitespace  Please ensure that the input has the delimiters in right place  UPDATED ANSWER for your comment   I just tried to create an input file with the content as below  a    abaissa abaissable abaissables abaissai abaissaient abaissais abaissait   tried to read it with the below code it just worked fine    File file   new File   home keerthivasan Desktop input txt         Scanner scr   null           try               scr   new Scanner file               while scr hasNext                     System out println  line     scr next                             catch  FileNotFoundException ex                Logger getLogger ScannerTest class getName    log Level SEVERE  null  ex               Output   line   a line      line   abaissa line   abaissable line   abaissables line   abaissai line   abaissaient line   abaissais line   abaissait   so  I am sure that this should work  Since you work in Windows ennvironment  The End of Line  EOL  sequence  0x0D 0x0A   r n  is actually two ASCII characters  a combination of the CR and LF characters  if you set your Scanner instance to use delimiter as follows  it will pick up probably   scr   new Scanner file    scr useDelimiter   r n      and then do your looping to read lines  Hope this helps

[java] Read line with Scanner

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