while EOF in JAVA

Question

Following to some forums answers I m using this       while  fileReader nextLine      null            String line   fileReader nextLine            System out println line                 but it throws exception at the end anyway  Exception in thread  main  java util NoSuchElementException  No line found

User · Answer

Each call to nextLine   moves onto the next line  so when you are actually at the last readable line and the while check passes inspection  the next call to nextLine   will return EOF     Perhaps you could do one of the following instead   If fileReader is of type Scanner   while   line   fileReader hasNextLine       null        String line   fileReader nextLine         System out println line       If fileReader is of type BufferedReader   String line  while   line   fileReader readLine       null        System out println line       So you re reading the current line in the while condition and saving the line in a string for later use

User · Answer

The problem is that you re reading nextLine   on the while loop and THEN reading it to a variable  Not only are you getting every 2nd line printed out you re opening yourself to the exception being thrown  An example   File   Hello  Blah blah blah  Sincerely  CapnStank PS  Something something   On first iteration through the loop  The check on while will consume the  Hello   as not equal to null  Inside the loop body you ll see Blah blah blah  printed to the System   The process will repeat with Sincerely  being consumed and Capnstank printing out   Finally the while will consume the  PS  line while the String line   fileReader nextLine   retreives an exception from the file because there s nothing further to read   To resolve the issue   String line   fileReader nextLine     while  line    null      System out println line     line   fileReader nextLine

User · Answer

nextLine   will throw an exception when there s no line and it will never return null you can try the Scanner Class instead   http   docs oracle com javase 1 5 0 docs api java util Scanner html

User · Answer

while inFile hasNext      This is correct in java programming language

User · Answer

The others told you enough about your issue with multiple calls of readLine     I just wanted to leave sth about code style  While you see this line   assignement and    null check together in one while condition in most examples  like  gotomanners example here  I prefer using a for for it   It is much more readable in my opinion      for  String line   in readLine    line    null  line   in readLine                  Another nice way to write it you see in  TheCapn s example  But when you write it that way you easily see that s what a for-loop is made for   I do not like assignments scrambled with conditions in one line  It is bad style in my opinion  But because it is so MUCH popular for that special case here to do it that way I would not consider it really bad style   But cannot understand who established this bad style to become that popular

User · Answer

To read a file Scanner class is recommended        Scanner scanner   new Scanner new FileInputStream fFileName   fEncoding       try         while  scanner hasNextLine              System out println scanner nextLine                       finally        scanner close

User · Answer

you should use while  fileReader hasNextLine

[java] while EOF in JAVA?

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