Count words in a string method

Question

I was wondering how I would write a method to count the number of words in a java string only by using string methods like charAt  length  or substring   Loops and if statements are okay   I really appreciate any help I can get  Thanks

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String a    Some String       int count   0      for  int i   0  i  lt  a length    i               if  Character isWhitespace a charAt i                  count                         System out println count 1     It will count white spaces  However  If we add 1 in count   we can get exact words

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My idea of that program is that   package text  import java io BufferedReader  import java io IOException  import java io InputStreamReader   public class CoutingWords        public static void main String   args  throws IOException           String str          int cWords   1          char ch           BufferedReader buffor   new BufferedReader new InputStreamReader System in             System out println  Enter text              str   buffor readLine             for int i  0  i lt str length    i                 ch   str charAt i               if Character isWhitespace ch    cWords                        System out println  There are      int cWords    words

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I just put this together  The incrementer in the wordCount   method is a bit inelegant to me  but it works    import java util     public class WordCounter    private String word  private int numWords   public int wordCount String wrd        StringTokenizer token   new StringTokenizer wrd            word   token nextToken        numWords   token countTokens        numWords         return numWords     public static void main String   args         Scanner input   new Scanner System in        String userWord       WordCounter wc   new WordCounter         System out println  Enter a sentence         userWord   input nextLine         wc wordCount userWord        System out println  You sentence was     wc numWords     words long

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public static int countWords String input            int wordCount   0          boolean isBlankSet   false          input   input trim             for  int j   0  j  lt  input length    j                  if  input charAt j                          isBlankSet   true              else                   if  isBlankSet                        wordCount                        isBlankSet   false                                                      return wordCount   1

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create variable count  state  initialize variables if space is present keep count as it is else increase count  for eg  if  string charAt i             state   0    else if  state    0    state   1  count    1

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Use   myString split    s       This will work

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I m new to stackoverflow but I hope my code helps   private int numOfWordsInLineCounter String line         int words   0            for int i   1   i lt line length   i              Character ch    line charAt i-1            Character bch   line charAt i                if Character isLetterOrDigit ch     true  amp  amp  Character isLetterOrDigit bch    false   words                 if i    line length  -1  amp  amp  Character isLetterOrDigit bch  words                    return words

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Counting Words in a String  This might also help --   package data structure test  import java io BufferedReader  import java io IOException  import java io InputStreamReader  public class CountWords        public static void main String   args  throws IOException      Couting number of words in a string         BufferedReader br   new BufferedReader new InputStreamReader System in            System out println  enter Your String            String input   br readLine              char   arr   input toCharArray            int i   0      boolean notCounted   true      int counter   0      while  i  lt  arr length            if  arr i                        if  notCounted                    notCounted   false                  counter                            else               notCounted   true                    i              System out println  words in the string are       counter

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public static int countWords String s        int wordCount   0       boolean word   false      int endOfLine   s length   - 1       for  int i   0  i  lt  s length    i                 if the char is a letter  word   true          if  Character isLetter s charAt i    amp  amp  i    endOfLine                word   true                 if char isn t a letter and there have been letters before                 counter goes up            else if   Character isLetter s charAt i    amp  amp  word                wordCount                word   false                 last word of String  if it doesn t end with a non letter  it                wouldn t count without this            else if  Character isLetter s charAt i    amp  amp  i    endOfLine                wordCount                        return wordCount

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if str isEmpty      str trim   length      0      return 0    return  str trim   split    s    length

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There is a Simple Solution You can Try this code       String s    hju   vg    jhdgsf  dh gg    g g  g          String   words   s trim   split    s          System out println  count is      words length

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This would work even with multiple spaces and leading and or trailing spaces and blank lines   String trim   s trim    if  trim isEmpty        return 0  return trim split    s    length     separate string around spaces   Hope that helps  More info about split here

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Taking the chosen answer as a starting point the following deals with a few English language issues including hyphenated words  apostrophes for possessives and shortenings  numbers and also any characters outside of UTF-16   public static int countWords final String s        int wordCount   0      boolean word   false      final int endOfLine   s length   - 1       for  int i   0  i  lt  s length    i                 if the char is a letter  word   true          if  isWordCharacter s  i   amp  amp  i    endOfLine                word   true                 if char isn t a letter and there have been letters before                 counter goes up            else if   isWordCharacter s  i   amp  amp  word                wordCount                word   false                 last word of String  if it doesn t end with a non letter  it                wouldn t count without this            else if  isWordCharacter s  i   amp  amp  i    endOfLine                wordCount                        return wordCount     private static boolean isWordCharacter final String s  final int i        final char ch   s charAt i       return Character isLetterOrDigit ch                 ch                        Character getType ch     Character DASH PUNCTUATION                Character isSurrogate ch

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lambda  in which splitting and storing of the counted words is dispensed withand only counting is done String text    quot counting w o apostrophe s problems or consecutive   spaces quot    int count   text codePoints   boxed   collect      Collector of             - gt  new int    0  0            a  c  - gt              if   quot      t quot  indexOf  c    gt   0               a 1    0            else if  a 1       0   a 0                 a  b  - gt   a 0     b 0   return  a              a - gt  a 0        gets  7 works as a status machine that counts the transitions from spacing characters      t to words

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Simply use     str split    w    length

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public static int countWords String str           if str    null    str isEmpty                return 0           int count   0          for int e   0  e  lt  str length    e                 if str charAt e                           count                    while str charAt e          amp  amp  e  lt  str length  -1                       e                                                      return count

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Algo in O N    count   0    if str 0     validChar           count     else         for i   1   i  lt  sizeOf str    i                if str i     validChar AND str i-1     validChar                count               end if         end for    end if    return count

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import java util   import java io    public class Main    public static void main String   args         File f new File  src MyFrame java        String value null      int i 0      int j 0      int k 0  try       Scanner  in  new Scanner f       while in hasNextLine              String a in nextLine        k         char chars   a toCharArray        i   chars length            in close        Scanner in2 new Scanner f       while in2 hasNext                           String b in2 next            System out println b           j                     in2 close         System out println  the number of chars is    i       System out println  the number of words is    j       System out println  the number of lines is    k          catch  Exception e        e printStackTrace

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public class TestStringCount      public static void main String   args        int count 0      boolean word  false      String str    how ma ny wo rds are th ere in th is sente nce       char   ch   str toCharArray        for int i  0 i lt ch length i             if   ch i                      for int j i j lt ch length j   i                     if   ch j                              word  true                      if j  ch length-1                           count                                              continue                                    else                      if word                           count                                              word   false                                                    else              continue                      System out println  there are    count    words

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A string phrase normaly has words separated by space   Well you can split the phrase using the spaces as separating characters and count them as follows   import java util HashMap   import java util Map   public class WordCountMethod        public static void main  String    args            Map lt String  Integer gt m   new HashMap lt String  Integer gt             String phrase    hello my name is John I repeat John           String    array   phrase split                for int i  0  i  lt  array length  i                 String word i   array i               Integer ci   m get word i               if ci    null                   m put word i  1                             else m put word i  ci 1                      for String s   m keySet                 System out println s   repeats   m get s

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private static int countWordsInSentence String input        int wordCount   0       if  input trim   equals                return wordCount            else           wordCount   1             for  int i   0  i  lt  input length    i              char ch   input charAt i           String str   new String      ch           if  i 1    input length    amp  amp  str equals       amp  amp        input charAt i 1   equals                     wordCount                         return wordCount

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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            add at the pom xml  lt dependency gt       lt groupId gt com google guava lt  groupId gt       lt artifactId gt guava lt  artifactId gt       lt version gt r09 lt  version gt   lt  dependency gt

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Hi I just figured out with StringTokenizer like this   String words    word word2 word3 word4   StringTokenizer st   new Tokenizer words   st countTokens

[java] Count words in a string method?

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