How to capitalize the first letter of word in a string using Java

Question

Example strings  one thousand only two hundred twenty seven   How do I change the first character of a string in capital letter and not change the case of any of the other letters   After the change it should be   One thousand only Two hundred Twenty Seven   Note  I don t want to use the apache commons lang WordUtils to do this

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Actually  you will get the best performance if you avoid   operator and use concat   in this case  It is the best option for merging just 2 strings  not so good for many strings though   In that case the code would look like this   String output   input substring 0  1  toUpperCase   concat input substring 1

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Example using StringTokenizer class    String st      hello all students   String st1  char f  String fs     StringTokenizer a  new StringTokenizer st   while a hasMoreTokens                st1 a nextToken            f Character toUpperCase st1 charAt 0            fs  f  st1 substring 1           System out println fs

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Use this   char   chars    Character toUpperCase A charAt 0     Character toUpperCase B charAt 0     String a1   chars 0    A substring 1   String b1   chars 1    B substring 1

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The following will give you the same consistent output regardless of the value of your inputString   if StringUtils isNotBlank inputString         inputString   StringUtils capitalize inputString toLowerCase

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class Test        public static void main String   args            String newString             String test  Hii lets cheCk for BEING String             String   splitString   test split               for int i 0  i lt splitString length  i                 newString  newString  splitString i  substring 0 1  toUpperCase                          splitString i  substring 1 splitString i  length    toLowerCase                          System out println  the new String is   newString

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Even for  simple  code  I would use libraries  The thing is not the code per se  but the already existing test cases covering exceptional cases  This could be null  empty strings  strings in other languages   The word manipulation part has been moved out ouf Apache Commons Lang  It is now placed in Apache Commons Text  Get it via https   search maven org artifact org apache commons commons-text   You can use WordUtils capitalize String str  from Apache Commons Text  It is more powerful than you asked for  It can also capitalize fulle  e g   fixing  oNe tousand only     Since it works on complete text  one has to tell it to capitalize only the first word    WordUtils capitalize  one thousand only   new char 0      Full JUnit class to enable playing with the functionality   package io github koppor   import org apache commons text WordUtils  import org junit jupiter api Test   import static org junit jupiter api Assertions     class AppTest       Test   void test         assertEquals  One thousand only   WordUtils capitalize  one thousand only   new char 0

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Solution with StringBuilder    value   new StringBuilder                    append value substring 0  1  toUpperCase                     append value substring 1                    toString         based on previous answers

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Adding everything together  it is a good idea to trim for extra white space at beginning of string   Otherwise   substring 0 1  toUpperCase will try to capitalize a white space       public String capitalizeFirstLetter String original            if  original    null    original length      0                return original                    return original trim   substring 0  1  toUpperCase     original substring 1

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Here you go  hope this give you the idea                                                                                   Compilation   javac Capitalize java     Execution     java Capitalize  lt  input txt         Read in a sequence of words from standard input and capitalize each     one  make first letter uppercase  make rest lowercase            java Capitalize     now is the time for all good      Now Is The Time For All Good      to be or not to be that is the question     To Be Or Not To Be That Is The Question         Remark  replace sequence of whitespace with a single space                                                                                  public class Capitalize        public static String capitalize String s            if  s length      0  return s          return s substring 0  1  toUpperCase     s substring 1  toLowerCase               public static void main String   args            while   StdIn isEmpty                  String line   StdIn readLine                String   words   line split    s                for  String s   words                    StdOut print capitalize s                                    StdOut println

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Also  There is org springframework util StringUtils in Spring Framework   StringUtils capitalize str

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Simplest way is to use org apache commons lang StringUtils class  StringUtils capitalize Str

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StringUtils capitalize str   from apache commons-lang

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You can try the following code   public string capitalize str        String   array   str split           String newStr      for int i   0  i  lt  array length  i              newStr    array i  substring 0 1  toUpperCase     array i  substring 1                   return newStr trim

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1  Using String s substring   Method  public static String capitalize String str        if str   null    str isEmpty              return str             return str substring 0  1  toUpperCase     str substring 1       Now just call the capitalize   method to convert the first letter of a string to uppercase   System out println capitalize  stackoverflow        Stackoverflow System out println capitalize  heLLo        HeLLo System out println capitalize null       null   2  Apache Commons Lang  The StringUtils class from Commons Lang provides the capitalize   method that can also be used for this purpose   System out println StringUtils capitalize  apache commons        Apache commons System out println StringUtils capitalize  heLLO        HeLLO System out println StringUtils uncapitalize null       null   Add the following dependency to your pom xml file  for Maven only     lt dependency gt       lt groupId gt org apache commons lt  groupId gt       lt artifactId gt commons-lang3 lt  artifactId gt       lt version gt 3 9 lt  version gt   lt  dependency gt    Here is an article that explains these two approaches in detail

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If you only want to capitalize the first letter of a string named input and leave the rest alone   String output   input substring 0  1  toUpperCase     input substring 1     Now output will have what you want  Check that your input is at least one character long before using this  otherwise you ll get an exception

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My functional approach  its capstilise first character in sentence after whitescape in whole paragraph   For capatilising only first character of the word just remove  split                  b name split                        filter    it isEmpty                       map   it substring 0  1  toUpperCase                      it substring 1  toLowerCase                        joinToString

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if you only want to capitalize the first letter then the below code can be used   String output   input substring 0  1  toUpperCase     input substring 1

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public static String capitalize String str           String   inputWords   str split               String outputWords               for  String word   inputWords               if   word isEmpty                     outputWords   outputWords       StringUtils capitalize word                                   return outputWords

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I would like to add a NULL check and IndexOutOfBoundsException on the accepted answer   String output   input substring 0  1  toUpperCase     input substring 1     Java Code     class Main         public static void main String   args            System out println  Capitalize first letter             System out println  Normal  check  1            captializeFirstLetter  one thousand only                 System out println  Normal  check  2            captializeFirstLetter  two hundred                 System out println  Normal  check  3            captializeFirstLetter  twenty                 System out println  Normal  check  4            captializeFirstLetter  seven                  System out println  Single letter check        captializeFirstLetter  a                 System out println  IndexOutOfBound check       captializeFirstLetter                   System out println  Null Check                  captializeFirstLetter null                       static String captializeFirstLetter String input                if input  null  amp  amp  input length    gt 0                   input   input substring 0  1  toUpperCase     input substring 1                             return input                    Output   Normal  check  1         One thousand only  Normal  check  2         Two hundred  Normal  check  3         Twenty  Normal  check  4         Seven  Single letter check      A  IndexOutOfBound check      Null Check               null

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public String capitalizeFirstLetter String original        if  original    null    original length      0            return original            return original substring 0  1  toUpperCase     original substring 1       Just    a complete solution  I see it kind of just ended up combining what everyone else ended up posting  P

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Its simple only one line code is needed for this  if String A   scanner nextLine    then you need to write this to display the string with this first letter capitalized   System out println A substring 0  1  toUpperCase     A substring 1     And its done now

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Given the input string   Character toUpperCase input charAt 0     input substring 1  toLowerCase

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String s t getText   trim    int l s length    char c Character toUpperCase s charAt 0    s c s substring 1   for int i 1  i lt l  i                  if s charAt i                              c Character toUpperCase s charAt i 1                s s substring 0  i    c   s substring i 2                       t setText s

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Update July 2019  Currently  the most up-to-date library function for doing this is contained in  org apache commons lang3 StringUtils  import org apache commons lang3 StringUtils   StringUtils capitalize myString     If you re using Maven  import the dependency in your pom xml    lt dependency gt     lt groupId gt org apache commons lt  groupId gt     lt artifactId gt commons-lang3 lt  artifactId gt     lt version gt 3 9 lt  version gt   lt  dependency gt

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String sentence    ToDAY   WeAthEr   GREat       public static String upperCaseWords String sentence            String words     sentence replaceAll    s         trim   split               String newSentence               for  String word   words                for  int i   0  i  lt  word length    i                    newSentence   newSentence     i    0    word substring i  i   1  toUpperCase                          i    word length   - 1    word substring i  i   1  toLowerCase     word substring i  i   1  toLowerCase   toLowerCase                              return newSentence          Today Weather Great

[java] How to capitalize the first letter of word in a string using Java?

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