Converting a sentence string to a string array of words in Java

Question

I need my Java program to take a string like    This is a sample sentence     and turn it into a string array like     this   is   a   sample   sentence     No periods  or punctuation  preferably   By the way  the string input is always one sentence   Is there an easy way to do this that I m not seeing  Or do we really have to search for spaces a lot and create new strings from the areas between the spaces  which are words

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String split   will do most of what you want  You may then need to loop over the words to pull out any punctuation   For example   String s    This is a sample sentence    String   words   s split    s     for  int i   0  i  lt  words length  i             You may want to check for a non-word character before blindly        performing a replacement        It may also be necessary to adjust the character class     words i    words i  replaceAll      w

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Following is a code snippet which splits a sentense to word and give its count too    import java util HashMap   import java util Iterator   import java util Map    public class StringToword   public static void main String   args        String s  a a a A A       String   splitedString s split           Map m new HashMap        int count 1      for String s1  splitedString            count m containsKey s1  count 1 1            m put s1  count                 Iterator lt StringToword gt  itr m entrySet   iterator        while itr hasNext             System out println itr next

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The easiest and best answer I can think of is to use the following method defined on the java string -  String   split String regex    And just do  This is a sample sentence  split        Because it takes a regex  you can do more complicated splits as well  which can include removing unwanted punctuation and other such characters

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You can use simple following code  String str   This is a sample sentence    String   words   str split                  for int i 0 i lt words length i    System out print words i

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I already did post this answer somewhere  i will do it here again  This version doesn t use any major inbuilt method  You got the char array  convert it into a String  Hope it helps   import java util Scanner   public class SentenceToWord        public static int getNumberOfWords String sentence                int counter 0          for int i 0 i lt sentence length   i                          if sentence charAt i                    counter                      return counter 1             public static char   getSubString String sentence int start int end    method to give substring  replacement of String substring                  int counter 0          char charArrayToReturn   new char end-start           for int i start i lt end i                          charArrayToReturn counter    sentence charAt i                     return charArrayToReturn             public static char     getWordsFromString String sentence                int wordsCounter 0          int spaceIndex 0          int length sentence length            char wordsArray     new char getNumberOfWords sentence               for int i 0 i lt length i                          if sentence charAt i          i 1  length                            wordsArray wordsCounter    getSubString sentence  spaceIndex i 1     get each word as substring             spaceIndex i 1    increment space index                                 return  wordsArray    return the 2 dimensional char array             public static void main String   args             System out println  Please enter the String        Scanner input new Scanner System in       String userInput input nextLine   trim        int numOfWords getNumberOfWords userInput       char words     new char numOfWords 1         words getWordsFromString userInput       System out println  Total number of words found in the String is    numOfWords        for int i 0 i lt numOfWords i                  System out println               for int j 0 j lt words i  length j                      System out print words i  j     print out each char one by one

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Now  this can be accomplished just with split as it takes regex   String s    This is a sample sentence with   s    String   words   s split    W       this will give words as    this   is   a   sample   sentence    s    The   W  will match all non-alphabetic characters occurring one or more times  So there is no need to replace  You can check other patterns also

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Try using the following   String str    This is a simple sentence   String   strgs   str split         That will create a substring at each index of the array of strings using the space as a split point

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You can just split your string like that using this regular expression  String l    sofia  malgr   tout aimait   la laitue et le choux     lt br  gt  l split

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Use string replace          replace          replace          replace         split      to split your code into an array with no periods  commas  question marks  or exclamation marks  You can add remove as many replace calls as you want

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string replaceAll   doesn t correctly work with locale different from predefined  At least in jdk7u10   This example creates a word dictionary from textfile with windows cyrillic charset CP1251     public static void main  String   args        String fileName    quot Tolstoy VoinaMir txt quot       try           List lt String gt  lines   Files readAllLines Paths get fileName                                                   Charset forName  quot CP1251 quot             Set lt String gt  words   new TreeSet lt  gt             for  String s  lines                 for  String w   s split  quot   s  quot                      w   w replaceAll  quot   p Punct  quot   quot  quot                    words add w                                   for  String w  words                System out println w                   catch  Exception e            e printStackTrace

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Another way to do that is StringTokenizer  ex -   public static void main String   args         String str    This is a sample string       StringTokenizer st   new StringTokenizer str           String starr   new String st countTokens         while  st hasMoreElements              starr i    st nextElement

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You can use BreakIterator getWordInstance to find all words in a string   public static List lt String gt  getWords String text        List lt String gt  words   new ArrayList lt String gt         BreakIterator breakIterator   BreakIterator getWordInstance        breakIterator setText text       int lastIndex   breakIterator first        while  BreakIterator DONE    lastIndex            int firstIndex   lastIndex          lastIndex   breakIterator next            if  lastIndex    BreakIterator DONE  amp  amp  Character isLetterOrDigit text charAt firstIndex                  words add text substring firstIndex  lastIndex                         return words      Test   public static void main String   args        System out println getWords  A PT CR M0RT BOUSG SABN NTE TR GB  G    RAND MIN XXX  YY   ABC           Ouput    A  PT  CR  M0RT  BOUSG  SABN  NTE  TR  GB  G  RAND  MIN  XXX  YY  ABC

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Here is a solution in plain and simple C   code with no fancy function  use DMA to allocate a dynamic string array  and put data in array till you find a open space  please refer code below with comments  I hope it helps    include lt bits stdc   h gt  using namespace std   int main      string data  hello there how are you      a size 5  char count  23   getline cin data    int count 0     initialize a count to count total number of spaces in string  int len data length    for  int i   0  i  lt   int data length      i        if data i                        count            declare a string array  1 greater than the size     num of space in string  string  str   new string count 1    int i  start 0  for  int index 0  index lt count 1    index     index array to increment index of string array and feed data      string temp         for   i   start  i  lt len    i                   if data i          increment temp stored word till you find a space                        temp temp data i            else              start i 1     increment i counter to next to the space             break                 str index  temp        print data  for  int i   0  i  lt  count 1    i        cout lt  lt str i  lt  lt             return 0

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You can also use BreakIterator getWordInstance

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Try this   String   stringArray   Pattern compile  ian   split   This is a sample sentence   replaceAll      p Alnum            this will remove all non alpha numeric chars     for  int j 0  i lt stringArray  length  j        System out println i           stringArray  j

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Most of the answers here convert String to String Array as the question asked  But Generally we use List   so more useful will be -  String dummy    This is a sample sentence    List lt String gt  wordList  Arrays asList dummy split

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This should help   String s    quot This is a sample sentence quot    String   words   s split  quot   quot     this will make an array with elements as the string separated by  quot   quot

[java] Converting a sentence string to a string array of words in Java

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