how to count the spaces in a java string

Question

I need to count the number of spaces in my string but my code gives me a wrong number when i run it  what is wrong    int count 0      String arr   s split   t        OOPHelper println  Number of spaces are    arr length       count

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A solution using java util regex Pattern   java util regex Matcher  String test    foo bar baz    Pattern pattern   Pattern compile       Matcher matcher   pattern matcher test   int count   0  while  matcher find          count      System out println count

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public static void main String   args      Scanner input  new Scanner System in     String data input nextLine    int cnt 0  System out println data   for int i 0 i lt data length  -1 i     if data charAt i                      cnt             System out println  Total number of Spaces in a given String are    cnt

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Fastest way to do this would be   int count   0  for int i   0  i  lt  str length    i           if Character isWhitespace str charAt i    count        This would catch all characters that are considered whitespace    Regex solutions require  compiling regex and excecuting it - with a lot of overhead   Getting character array requires allocation   Iterating over byte array would be faster  but only if you are sure that your characters are ASCII

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t will match tabs  rather than spaces and should also be referred to with a double slash    t  You could call s split        but that wouldn t count consecutive spaces  By that I mean     String bar     ba jfjf jjj j      String   split   bar split         System out println  split length       Returns 5   So  despite the fact there are seven space characters  there are only five blocks of space  It depends which you re trying to count  I guess   Commons Lang is your friend for this one   int count   StringUtils countMatches  inputString

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please check the following code  it can help    public class CountSpace        public static void main String   args             String word    S N PRASAD RAO           String data   int k 0          data word split              for int i 0 i lt data length i                 if data i  equals                        k                                     System out println k

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I just had to do something similar to this and this is what I used   String string   stringValue  String   stringArray   string split    s     int length   stringArray length  System out println  The number of parts is      length

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The most precise and exact plus fastest way to that is    String Name  Infinity War is a good movie        int count  0       for int i 0 i lt Name length   i         if Character isWhitespace Name charAt i         count  1                       System out println count

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Your code will count the number of tabs and not the number of spaces  Also  the number of tabs will be one less than arr length

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The simple and fastest way to count spaces   String fav  foo hello me hi   for  int i 0  i lt fav length    i               if fav charAt i                         counter

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s length   - s replaceAll          length   returns you number of spaces   There are more ways  For example   int spaceCount   0  for  char c   str toCharArray          if  c                    spaceCount              etc   etc   In your case you tried to split string using  t - TAB  You will get right result if you use     instead  Using  s may be confusing since it matches all whitepsaces - regular spaces and TABs

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public static void main String   args        String str    Honey   dfd    tEch Solution       String   arr   str split           System out println arr length       int count   0      for  int i   0  i  lt  arr length  i              if   arr i  trim   isEmpty                  System out println arr i                count                        System out println count

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Another way using regular expressions  int length   text replaceAll             length

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Here s a different way of looking at it  and it s a simple one-liner  int spaces   s replaceAll  quot      quot    quot  quot   length     This works by effectively removing all non-spaces then taking the length of what   s left  the spaces   You might want to add a null check  int spaces   s    null   0   s replaceAll  quot      quot    quot  quot   length      Java 8 update You can use a stream too  int spaces   s chars   filter c - gt  c     int      count

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This program will definitely help you   class SpaceCount        public static int spaceCount String s        int a 0          char ch    new char s length             for int i   0  i  lt  s length    i                 ch i   s charAt i               if  ch i                     a                                 return a              public static void main String    s                int m   spaceCount  Hello I am a Java Developer            System out println  The number of words in the String are      m

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The code you provided would print the number of tabs  not the number of spaces  The below function should count the number of whitespace characters in a given string   int countSpaces String string        int spaces   0      for int i   0  i  lt  string length    i              spaces     Character isWhitespace string charAt i      1   0            return spaces

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If you use Java 8  the following should work   long count    0 1 2 3 4   chars   filter Character  isWhitespace  count      This will also work in Java 8 using Eclipse Collections   int count   Strings asChars  0 1 2 3 4    count Character  isWhitespace     Note  I am a committer for Eclipse Collections

[java] how to count the spaces in a java string?

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