How can I find whitespace in a String

Question

How can I check to see if a String contains a whitespace character  an empty space or       If possible  please provide a Java example    For example  String    test word

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String str    Test Word               if str indexOf         -1                   return true                else                  return false

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Use this code  was better solution for me   public static boolean containsWhiteSpace String line       boolean space  false       if line    null             for int i   0  i  lt  line length    i                  if line charAt i                       space  true                                     return space

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Use Apache Commons StringUtils   StringUtils containsWhitespace str

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You could use Regex to determine if there s a whitespace character   s   More info of regex here

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import java util Scanner  public class camelCase    public static void main String   args        Scanner user input new Scanner System in       String Line1      Line1   user input nextLine        int j 1        Now Read each word from the Line and convert it to Camel Case      String result       result1           for  int i   0  i  lt  Line1 length    i              String next   Line1 substring i  i   1           System out println next      i Value     i      j Value     j           if  i    0   j    1                         result    next toUpperCase              else               result    next toLowerCase                       if  Character isWhitespace Line1 charAt i      true                        j 1                    else                       j 0                      System out println result

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Use org apache commons lang StringUtils    to search for whitespaces       boolean withWhiteSpace   StringUtils contains  my name            To delete all whitespaces in a string       StringUtils deleteWhitespace null            null    StringUtils deleteWhitespace                       StringUtils deleteWhitespace  abc             abc     StringUtils deleteWhitespace     ab  c        abc

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public static void main String   args        System out println  test word  contains

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You can basically do this  if s charAt i   32      return true      You must write boolean method Whitespace char is 32

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This will  tell if you there is any whitespaces   Either by looping   for  char c   s toCharArray          if  Character isWhitespace c            return true            or  s matches      s        And StringUtils isBlank s  will tell you if there are only whitepsaces

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I purpose to you a very simple method who use String contains   public static boolean containWhitespace String value        return value contains           A little usage example   public static void main String   args        System out println containWhitespace  i love potatoes         System out println containWhitespace  butihatewhitespaces         Output   true false

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package com test   public class Test        public static void main String   args             String str    TestCode            if  str indexOf       gt  -1                System out println  Yes              else               System out println  Noo

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For checking if a string contains whitespace use a Matcher and call it s find method   Pattern pattern   Pattern compile    s    Matcher matcher   pattern matcher s   boolean found   matcher find      If you want to check if it only consists of whitespace then you can use String matches   boolean isWhitespace   s matches     s

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Check whether a String contains at least one white space character   public static boolean containsWhiteSpace final String testCode       if testCode    null           for int i   0  i  lt  testCode length    i                 if Character isWhitespace testCode charAt i                     return true                                    return false      Reference    Character isWhitespace char      Using the Guava library  it s much simpler   return CharMatcher WHITESPACE matchesAnyOf testCode     CharMatcher WHITESPACE is also a lot more thorough when it comes to Unicode support

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You can use charAt   function to find out spaces in string       public class Test     public static void main String args         String fav  Hi Testing  12 3      int counter 0     for  int i 0  i lt fav length    i           if fav charAt i                  counter                       System out println  Number of spaces    counter         This will print Number of spaces 4

[java] How can I find whitespace in a String?

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