Removing whitespace from strings in Java

Question

I have a string like this    mysz    name john age 13 year 2001     I want to remove the whitespaces in the string  I tried trim   but this removes only whitespaces before and after the whole string  I also tried replaceAll    W       but then the   also gets removed   How can I achieve a string with   mysz2    name johnage 13year 2001

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The code you want is  str replaceAll    s         This will remove all the white spaces

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Use mysz replaceAll    s

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package com sanjayacchana challangingprograms   public class RemoveAllWhiteSpacesInString        public static void main String   args                     String str    quot name john age 13 year 2001 quot                    str   str replaceAll  quot   s quot    quot  quot                      System out println str

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public static String removeWhiteSpaces String str       String s           char   arr   str toCharArray        for  int i   0  i  lt  arr length  i              int temp   arr i           if temp    32  amp  amp  temp    9       32 ASCII for space and 9 is for Tab             s    arr i                       return s      This might help

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If you need to remove unbreakable spaces too  you can upgrade your code like this    st replaceAll     s   u00A0

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When using st replaceAll    s       in Kotlin  make sure you wrap    s   with Regex    myString  replace Regex    s

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You ve already got the correct answer from Gursel Koca but I believe that there s a good chance that this is not what you really want to do  How about parsing the key-values instead   import java util Enumeration  import java util Hashtable   class SplitIt     public static void main String args            String person    name john age 13 year 2001        for  String p   person split    s            String   keyValue   p split             System out println keyValue 0            keyValue 1                     output    name   john   age   13   year   2001

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public static void main String   args                String s    name john age 13 year 2001       String t   s replaceAll               System out println  s      s      t      t      Output  s  name john age 13 year 2001  t  name johnage 13year 2001

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One way to handle String manipulations is StringUtils from Apache commons   String withoutWhitespace   StringUtils deleteWhitespace whitespaces     You can find it here  commons-lang includes lots more and is well supported

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String a  string with                multi spaces      or this  String b  a replaceAll    s         String c  a replace             replace            replace           replace            replace                it work fine with any spaces   don t forget space in sting b

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You can do it so simply by  String newMysz   mysz replace

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You can achieve this without using replaceAll   or any Predefined Method in Java  this way is preferred -  public class RemoveSpacesFromString        public static void main String   args               TODO Auto-generated method stub         String newString          String str    prashant is good            int i          char   strArray   str toCharArray            StringBuffer sb    new StringBuffer             for i   0  i lt strArray length  i                          if strArray i         amp  amp  strArray i      t                                 sb append strArray i                                    System out println sb              newString   str replaceAll                    System out println newString

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There are others space char too exists in strings   So space char we may need to replace from strings   Ex  NO-BREAK SPACE  THREE-PER-EM SPACE  PUNCTUATION SPACE  Here is the list of space char http   jkorpela fi chars spaces html  So we need to modify   u2004 us for THREE-PER-EM SPACE  s replaceAll    u0020 u2004

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mysz   mysz replace            First with space  second without space    Then it is done

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there are many ways to solve this problem  you can use split function or replace function of Strings   for more info refer smilliar problem http   techno-terminal blogspot in 2015 10 how-to-remove-spaces-from-given-string html

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private String generateAttachName String fileName  String searchOn  String char1        return fileName replaceAll searchOn  char1       String fileName  generateAttachName  Hello My Mom     s

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st replaceAll    s       removes all whitespaces and non-visible characters  e g   tab   n      st replaceAll    s       and st replaceAll    s      produce the same result   The second regex is 20  faster than the first one  but as the number consecutive spaces increases  the first one performs better than the second one     Assign the value to a variable  if not used directly   st   st replaceAll    s

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Use apache string util class is better to avoid NullPointerException  org apache commons lang3 StringUtils replace  abc def               Output   abcdef

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Quite a lot of answers are provided  I would like to give a solution which is quite readable and better than regex   import java io IOException   import org apache commons lang StringUtils   public class RemoveAllWhitespaceTest        public static void main String   args  throws IOException            String str1     n tThis is my string  n  r n               System out println       str1                  System out println  Whitespace Removed              System out println       StringUtils deleteWhitespace str1                   System out println

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Separate each group of text into its own substring and then concatenate those substrings   public Address String street  String city  String state  String zip         this street   street      this city   city         Now checking to make sure that state has no spaces        int position   state indexOf           if position  gt  0              now putting state back together if it has spaces            state   state substring 0  position    state substring position   1

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You should use s replaceAll  quot   s  quot    quot  quot     instead of  s replaceAll  quot   s quot    quot  quot     This way  it will work with more than one spaces between each string  The   sign in the above regex means  quot one or more  s quot  -- s   Anything that is a space character  including space  tab characters etc   Why do we need s  here

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If you prefer utility classes to regexes  there is a method trimAllWhitespace String  in StringUtils in the Spring Framework

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Try this   String str  name john age 13 year 2001   String s   str split       StringBuilder v new StringBuilder    for  String string   s        v append string     str v toString

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Using Pattern And Matcher it is more Dynamic   import java util regex Matcher  import java util regex Pattern   public class RemovingSpace                    param args        Removing Space Using Matcher             public static void main String   args            String str   jld fdkjg jfdg            String pattern     s            String replace              Pattern p  Pattern compile pattern           Matcher m p matcher str            str m replaceAll replace           System out println str

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To remove spaces in your example  this is another way to do it   String mysz    name john age 13 year 2001   String   test   mysz split       mysz   String join     mysz     What this does is it converts it into an array with the spaces being the separators  and then it combines the items in the array together without the spaces   It works pretty well and is easy to understand

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In java we can do following operation   String pattern     s    String replace     part  name john age 13 year 2001   Pattern p Pattern compile pattern   Matcher m p matcher part   part m replaceAll replace   System out println part     for this you need to import following packages to your program   import java util regex Matcher  import java util regex Pattern    i hope it will help you

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replaceAll    s         w   Anything that is a word character   W   Anything that isn t a word character  including punctuation etc    s   Anything that is a space character  including space  tab characters etc    S   Anything that isn t a space character  including both letters and numbers  as well as punctuation etc    Edit  As pointed out  you need to escape the backslash if you want  s to reach the regex engine  resulting in   s

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How about replaceAll    s        Refer here

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If you want remove all white space from the string   public String removeSpace String str        String result           for  int i   0  i  lt  str length    i             char c   str charAt i                   if c                     result    c                      return result

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You can also take a look at the below Java code  Following codes does not use any  built-in  methods          Remove all characters from an alphanumeric string      public class RemoveCharFromAlphanumerics        public static void main String   args             String inp    01239Debashish123Pattn456aik            char   out   inp toCharArray             int totint 0           for  int i   0  i  lt  out length  i                  System out println out i             int  out i                if   int  out i   gt   65  amp  amp   int  out i   lt   122                    out i                                   else                   totint  1                                    System out println String valueOf out            System out println String valueOf  Length     out length             for  int c 0  c lt out length  c                  System out println out c             int  out c                 if    int  out c     32                    System out println  Its Blank                     out c                                            System out println String valueOf out             System out println                        System out println                        char   whitespace   new char totint           int t 0          for  int d 0  d lt  out length  d                   int fst  32                 if   int  out d   gt   48  amp  amp   int  out d   lt  57                      System out println out d                    whitespace t   out d                   t  1                                     System out println                        System out println                         System out println  The String is      String valueOf whitespace               Input   String inp    01239Debashish123Pattn456aik     Output   The String is  01239123456

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The easiest way to do this is by using the org apache commons lang3 StringUtils class of commons-lang3 library such as  commons-lang3-3 1 jar  for example   Use the static method  StringUtils deleteWhitespace String str   on your input string  amp  it will return you a string after removing all the white spaces from it  I tried your example string  name john age 13 year 2001   amp  it returned me exactly the string that you wanted -  name johnage 13year 2001   Hope this helps

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White space can remove using isWhitespace function from Character Class   public static void main String   args        String withSpace    Remove white space from line       StringBuilder removeSpace   new StringBuilder         for  int i   0  i lt withSpace length   i             if  Character isWhitespace withSpace charAt i                 removeSpace removeSpace append withSpace charAt i                        System out println removeSpace

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I am trying an aggregation answer where I test all ways of removing all whitespaces in a string  Each method is ran 1 million times and then then the average is taken  Note  Some compute will be used on summing up all the runs     Results   1st place from  jahir  s answer   StringUtils with short text  1 21E-4 ms  121 0 ms   StringUtils with long text  0 001648 ms  1648 0 ms    2nd place   String builder with short text  2 48E-4 ms  248 0 ms  String builder with long text  0 00566 ms  5660 0 ms    3rd place   Regex with short text  8 36E-4 ms  836 0 ms  Regex with long text  0 008877 ms  8877 0 ms    4th place   For loop with short text  0 001666 ms  1666 0 ms  For loop with long text  0 086437 ms  86437 0 ms      Here is the code   public class RemoveAllWhitespaces       public static String Regex String text           return text replaceAll    s                    public static String ForLoop String text            for  int i   text length   - 1  i  gt   0  i--                if Character isWhitespace text codePointAt i                      text   text substring 0  i    text substring i   1                                    return text             public static String StringBuilder String text           StringBuilder builder   new StringBuilder text           for  int i   text length   - 1  i  gt   0  i--                if Character isWhitespace text codePointAt i                      builder deleteCharAt i                                    return builder toString              Here are the tests   import org junit jupiter api Test   import java util function Function  import java util stream IntStream   import static org junit jupiter api Assertions     public class RemoveAllWhitespacesTest       private static final String longText    123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222123 123  t 1adc  n 222       private static final String expected    1231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc2221231231adc222        private static final String shortText    123 123  t 1adc  n 222       private static final String expectedShortText    1231231adc222        private static final int numberOfIterations   1000000        Test     public void Regex LongText            RunTest  Regex LongText   text - gt  RemoveAllWhitespaces Regex text   longText  expected               Test     public void Regex ShortText            RunTest  Regex LongText   text - gt  RemoveAllWhitespaces Regex text   shortText  expectedShortText                Test     public void For LongText            RunTest  For LongText   text - gt  RemoveAllWhitespaces ForLoop text   longText  expected               Test     public void For ShortText            RunTest  For LongText   text - gt  RemoveAllWhitespaces ForLoop text   shortText  expectedShortText               Test     public void StringBuilder LongText            RunTest  StringBuilder LongText   text - gt  RemoveAllWhitespaces StringBuilder text   longText  expected               Test     public void StringBuilder ShortText            RunTest  StringBuilder ShortText   text - gt  RemoveAllWhitespaces StringBuilder text   shortText  expectedShortText              private void RunTest String testName  Function lt String String gt  func  String input  String expected           long startTime   System currentTimeMillis            IntStream range 0  numberOfIterations                   forEach x - gt  assertEquals expected  func apply input             double totalMilliseconds    double System currentTimeMillis   -  double startTime          System out println                  String format                            s   s ms   s ms                            testName                          totalMilliseconds    double numberOfIterations                          totalMilliseconds

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The most correct answer to the question is   String mysz2   mysz replaceAll    s         I just adapted this code from the other answers  I m posting it because besides being exactly what the question requested  it also demonstrates that the result is returned as a new string  the original string is not modified as some of the answers sort of imply    Experienced Java developers might say  of course  you can t actually modify a String   but the target audience for this question may well not know this

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W means  non word character   The pattern for whitespace characters is  s  This is well documented in the Pattern javadoc

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import java util    public class RemoveSpace       public static void main String   args            String mysz    name john age 13 year 2001           Scanner scan   new Scanner mysz            String result               while scan hasNext                  result    scan next                      System out println result

[java] Removing whitespace from strings in Java

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