Counting number of lines words and characters in a text file

Question

I am trying to take input from a user  and print the amount of lines  words  and characters in a text file   However  only the amount of words is correct  it always prints 0 for the lines and characters   import java util    import java io     public class TextFileInfoPrinter         public static void main String  args  throws FileNotFoundException                            Scanner console   new Scanner System in                           System out println  File to be read                  String inputFile   console next                 File file   new File inputFile               Scanner in   new Scanner file                int words   0              int lines   0              int chars   0               while in hasNext                                  in next                    words                               while in hasNextLine                                  in nextLine                    lines                               while in hasNextByte                                  in nextByte                    chars                               System out println  Number of lines      lines               System out println  Number of words      words               System out println  Number of characters      chars

User · Answer

import java io    class wordcount       public static int words 0      public static int lines 0      public static int chars 0      public static void wc InputStreamReader isr throws IOException               int c 0          boolean lastwhite true          while  c isr read     -1                        chars                if c    n                   lines                if c    t     c         c    n                     words              if chars  0                    chars                            public static void main String   args                FileReader fr          try                       if args length  0                                wc new InputStreamReader System in                              else                               for int i 0 i lt args length i                                          fr new FileReader args i                        wc fr                                                      catch IOException ie                        return                    System out println lines     words     chars

User · Answer

I m no Java expert  but I would presume that the  hasNext   hasNextLine and  hasNextByte all use and increment the same file position indicator  You ll need to reset that  either by creating a new Scanner as Aashray mentioned  or using a RandomAccessFile and calling file seek 0   after each loop

User · Answer

You could use regular expressions to count for you   String subject    First Line n Second Line nThird Line     Matcher wordM   Pattern compile    b  S    b   matcher subject     matches a word Matcher charM   Pattern compile      matcher subject     matches a character Matcher newLineM   Pattern compile    r   n   matcher subject     matches a linebreak  int words 0 chars 0 newLines 1    newLines is initially 1 because the first line has no corresponding linebreak  while wordM find    words    while charM find    chars    while newLineM find    newLines     System out println  Words    words   System out println  Chars    chars   System out println  Lines    newLines

User · Answer

try      int words   0      int lines   0      int chars   0      while in hasNextLine               lines            String line   in nextLine            chars    line length            words    new StringTokenizer line        countTokens

User · Answer

while in hasNextLine               lines            String line   in nextLine            for int i 0 i lt line length   i                          if line charAt i        amp  amp  line charAt i     n           chars                       words    new StringTokenizer line           countTokens

User · Answer

I think the best answer is   int words   0  int lines   0  int chars   0  while in hasNextLine           lines        String line   in nextLine       for int i 0 i lt line length   i                  if line charAt i        amp  amp  line charAt i     n           chars               words    new StringTokenizer line        countTokens

User · Answer

I agree with  Cthulhu answer  In your code you can reset your Scanner object  in     in reset      This will reset your in object at the first line of your file

User · Answer

in next    is consuming all the lines in the first while    After the end of your first while loop  there are no more characters to be read at the input stream   You should nest your character and word-counting within a while loop counting lines

User · Answer

Is there some reason why you think that   while in hasNext          in next        words        will not consume the entire input stream   It will do so  meaning that your other two while loops will never iterate  That s why your values for words and lines are still set to zero   You re probably better off reading the file one character at a time  increasing the character count each time through the loop  and also detecting the character to decide whether or not to increment the other counters   Basically  wherever you find a  n  increase the line count - you should probably also do this if the last character in the stream wasn t  n   And  whenever you transition from white-space to non-white-space  increase the word count  there ll probably be some tricky edge case processing at the stream beginning but that s an implementation issue    You re looking at something like the following pseudo-code     Init counters and last character  charCount   0 wordCount   0 lineCount   0 lastChar          Start loop   currChar   getNextChar   while currChar    EOF        Every character counts       charCount           Words only on whitespace transitions       if isWhite lastChar   amp  amp   isWhite currChar           wordCount          Lines only on newline characters       if currChar      n           lineCount        lastChar   currChar     currChar   getNextChar      Handle incomplete last line   if lastChar      n       lineCount

User · Answer

The file pointer is set to the end of the file when the 1st while is executed  try this   Scanner in   new Scanner file             while in hasNext                          in next                words                      in   new Scanner file           while in hasNextLine                          in nextLine                lines                      in   new Scanner file           while in hasNextByte                          in nextByte                chars

[java] Counting number of lines, words, and characters in a text file

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