Java word count program

Question

I am trying to make a program on word count which I have partially made and it is giving the correct result but the moment I enter space or more than one space in the string  the result of word count show wrong results because I am counting words on the basis of spaces used  I need help if there is a solution in a way that no matter how many spaces are I still get the correct result  I am mentioning the code below   public class CountWords        public static void main  String   args                     System out println  Simple Java Word Count Program                 String str1    Today is Holdiay Day                int wordCount   1               for  int i   0  i  lt  str1 length    i                                   if  str1 charAt i                                                 wordCount                                                  System out println  Word count is       wordCount

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To count specified words only like John  John99  John John and John s only  Change regex according to yourself and count the specified words only       public static int wordCount String content            int count   0          String regex      a-zA-Z      0-9       s                  Pattern pattern   Pattern compile regex           Matcher matcher   pattern matcher content           while matcher find                  count                System out println matcher group   trim       If want to display the matched words                   return count

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You need to read the file line by line and reduce the multiple occurences of the whitespaces appearing in your line to a single occurence and then count for the words  Following is a sample   public static void main String    args  throws IOException           FileInputStream fstream   new FileInputStream  c   test txt        DataInputStream in   new DataInputStream fstream       BufferedReader br   new BufferedReader new InputStreamReader in        String strLine      int wordcount   0      while   strLine   br readLine       null              strLine   strLine replaceAll    t b                 strLine   strLine replaceAll    2                   if   strLine isEmpty                 wordcount   wordcount   strLine split      length                       System out println wordcount       in close

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Not sure if there is a drawback  but this worked for me         Scanner input   new Scanner System in       String userInput   input nextLine        String trimmed   userInput trim        int count   1       for  int i   0  i  lt  trimmed length    i            if   trimmed charAt i           amp  amp   trimmed charAt i-1                     count

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import com google common base Optional  import com google common base Splitter  import com google common collect HashMultiset  import com google common collect ImmutableSet  import com google common collect Multiset   String str  Simple Java Word Count count Count Program   Iterable lt String gt  words   Splitter on      trimResults   split str       google word counter        Multiset lt String gt  wordsMultiset   HashMultiset create    for  String string   words           wordsMultiset add string toLowerCase        Set lt String gt  result   wordsMultiset elementSet    for  String string   result        System out println string   X   wordsMultiset count string

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public static void main  String   args          System out println  Simple Java Word Count Program          String str1    Today is Holdiay Day         String   wordArray   str1 trim   split    s          int wordCount   wordArray length        System out println  Word count is       wordCount       The ideas is to split the string into words on any whitespace character occurring any number of times  The split function of the String class returns an array containing the words as its elements  Printing the length of the array would yield the number of words in the string

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you should make your code more generic by considering other word separators as well   such as         etc    public class WordCounter      public int count String input           int count  0          boolean incrementCounter   false          for  int i 0  i lt input length    i                 if  isValidWordCharacter input charAt i                     incrementCounter   true               else if  incrementCounter                   count                    incrementCounter   false                                  if  incrementCounter  count      if string ends with a valid word         return count            private boolean isValidWordCharacter char c             any logic that will help you identify a valid character in a word            you could also have a method which identifies word separators instead of this         return  c  gt    A   amp  amp  c lt   Z       c  gt    a   amp  amp  c lt   z

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To count total words Or to count total words without repeat word count  public static void main String   args           TODO Auto-generated method stub     String test    I am trying to make make make       Pattern p   Pattern compile    w         Matcher m   p matcher test       HashSet lt String gt  hs    new HashSet lt  gt         int i 0      while  m find              i            hs add m group               System out println  Total words Count      i       System out println  Count without Repetation       hs size            Output    Total words Count  7  Count without Repeatation   5

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public class wordCount   public static void main String ar    throws Exception   System out println  Simple Java Word Count Program          int wordCount   1 count 1   BufferedReader br   new BufferedReader new FileReader  C  file txt                 String str2       str1                    while   str1   br readLine       null                         str2    str1                       for  int i   0  i  lt  str2 length    i                   if  str2 charAt i          amp  amp  str2 charAt i 1                               wordCount                                System out println  Word count is       wordCount

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String data    This world is mine       System out print data split    s    length

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public class TotalWordsInSentence       public static void main String   args             String str    This is sample sentence           int NoOfWOrds   1           for  int i   0  i lt str length   i                 if   str charAt i           amp  amp   i  0   amp  amp   str charAt i-1                            NoOfWOrds                                     System out println  Number of Words in Sentence      NoOfWOrds             In this code  There wont be any problem regarding white-space in it  just the simple for loop  Hope this helps

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You can use this code It may help you   public static void main  String   args        System out println  Simple Java Word Count Program        String str1    Today is Holdiay Day      int count 0     String   wCount str1 split           for int i 0 i lt wCount length i             if  wCount i  isEmpty                          count                      System out println count

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Use split regex  method   The result is an array of strings that was splited by regex   String s    Today is Holdiay Day   System out println  Word count is       s split      length

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You can use String split  read more here  instead of charAt  you will get good results  If you want to use charAt for some reason then try trimming the string before you count the words that way you won t have the extra space and an extra word

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try this  import java util ArrayList  import java util Collections  import java util HashMap  import java util List  import java util Map  public class wordcount       public static void main String   args            String s    India is my country  I love India           List lt String gt  qw   new ArrayList lt String gt             Map lt String  Integer gt  mmm   new HashMap lt String  Integer gt             for  String sp   s split                     qw add sp                     for  String num   qw                mmm put num  Collections frequency qw  num                      System out println mmm

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public class wordCOunt   public static void main String ar      System out println  Simple Java Word Count Program         String str1    Today is Holdiay Day        int wordCount   1       for  int i   0  i  lt  str1 length    i                   if  str1 charAt i         amp  amp  str1 charAt i 1                               wordCount                          System out println  Word count is       str1 length  - wordCount

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public static int CountWords String str       if str length      0            return 0      int count  0     for int i 0 i lt  str length   i             if str i                    continue         if i  gt  0  amp  amp  str charAt i-1                   count                    else if i  0  amp  amp  str charAt i                  count                      return count

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My implementation  not using StringTokenizer   Map lt String  Long gt  getWordCounts List lt String gt  sentences  int maxLength        Map lt String  Long gt  commonWordsInEventDescriptions   sentences          parallelStream            map sentence - gt  sentence replace                    map string - gt  string split                flatMap Arrays  stream           map s - gt  s toLowerCase             filter word - gt  word length    gt   2  amp  amp  word length    lt   maxLength           collect groupingBy Function identity    counting              Then  you could call it like this  as an example   getWordCounts list  9  entrySet   stream                    filter pair - gt  pair getValue    lt   3  amp  amp  pair getValue    gt   1                   findFirst                    orElseThrow    - gt       new RuntimeException  No matching word found     getKey      Perhaps flipping the method to return Map lt Long  String gt  might be better

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The full program working is      public class main        public static void main String   args             logicCounter counter1   new logicCounter            counter1 counter  I am trying to make a program on word count which I have partially made and it is giving the correct result but the moment I enter space or more than one space in the string  the result of word count show wrong results because I am counting words on the basis of spaces used  I need help if there is a solution in a way that no matter how many spaces are I still get the correct result  I am mentioning the code below              public class logicCounter        public void counter  String str             String str1   str          boolean space  true          int i           for   i   0  i  lt  str1 length    i                   if  str1 charAt i                            space true                else                   i                                     System out println  there are     i     letters

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Java does have StringTokenizer API and can be used for this purpose as below   String test    This is a test app   int countOfTokens   new StringTokenizer test  countTokens    System out println countOfTokens     OR  in a single line as below  System out println new StringTokenizer  This is a test app   countTokens       StringTokenizer supports multiple spaces in the input string  counting only the words trimming unnecessary spaces   System out println new StringTokenizer  This    is    a test    app   countTokens       Above line also prints 5

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This could be as simple as using split and count variable   public class SplitString        public static void main String   args            int count 0                  String s1  Hi i love to code            for String s s1 split                             count                      System out println count

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public class CountWords                public static void main  String   args                        System out println  Simple Java Word Count Program                String str1    Today is Holdiay Day               int wordCount   1              for  int i   0  i  lt  str1 length    i                                   if  str1 charAt i          amp  amp  str1 charAt i 1                                               wordCount                                                 System out println  Word count is       wordCount                         This gives the correct result because if space comes twice or more then it can t increase wordcount  Enjoy

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Two routes for this  One way would be to use regular expressions  You can find out more about regular expressions here   A good regular expression for this would be something like   w   Then count the number of matches   If you don t want to go that route  you could have a boolean flag that remembers if the last character you ve seen is a space  If it is  don t count it  So the center of the loop looks like this   boolean prevCharWasSpace true  for  int i   0  i  lt  str1 length    i           if  str1 charAt i                    prevCharWasSpace true        else          if prevCharWasSpace  wordChar            prevCharWasSpace   false             Update Using the split technique is exactly equivalent to what s happening here  but it doesn t really explain why it works   If we go back to our CS theory  we want to construct a Finite State Automa  FSA  that counts words  That FSA may appear as    If you look at the code  it implements this FSA exactly  The prevCharWasSpace keeps track of which state we re in  and the str1 charAt  i   is decideds which edge  or arrow  is being followed  If you use the split method  a regular expression equivalent of this FSA is constructed internally  and is used to split the string into an array

[java] Java word count program

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