How to upper case every first letter of word in a string

Question

I have a string   hello good old world  and i want to upper case every first letter of every word  not the whole string with  toUpperCase    Is there an existing java helper which does the job

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Trying to be more memory efficient than splitting the string into multiple strings  and using the strategy shown by Darshana Sri Lanka   Also  handles all white space between words  not just the     character   public static String UppercaseFirstLetters String str         boolean prevWasWhiteSp   true      char   chars   str toCharArray        for  int i   0  i  lt  chars length  i              if  Character isLetter chars i                  if  prevWasWhiteSp                    chars i    Character toUpperCase chars i                                  prevWasWhiteSp   false            else               prevWasWhiteSp   Character isWhitespace chars i                        return new String chars

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sString   sString toLowerCase    sString   Character toString sString charAt 0   toUpperCase   sString substring 1

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Here is an easy solution   public class CapitalFirstLetters     public static void main String   args        String word    it s java  baby        String   wordSplit      String wordCapital           wordSplit   word split           for  int i   0  i  lt  wordSplit length  i              wordCapital   wordSplit i  substring 0  1  toUpperCase     wordSplit i  substring 1                   System out println wordCapital

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So much simpler with regexes   Pattern spaces Pattern compile    s  a-z            Matcher m spaces matcher word       StringBuilder capitalWordBuilder new StringBuilder word substring 0 1  toUpperCase     int prevStart 1          while m find                      capitalWordBuilder append word substring prevStart m end  -1                    capitalWordBuilder append word substring m end  -1 m end    toUpperCase                     prevStart m end                         capitalWordBuilder append word substring prevStart word length        Output for input   this sentence Has Weird              caps   This Sentence Has Weird              Caps

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import java util Scanner  public class CapitolizeOneString        public static void main String   args                Scanner  scan   new Scanner System in           System out print   Please enter Your word                    String str scan nextLine             printCapitalized  str              end main        static void printCapitalized  String str                Print a copy of str to standard output  with the            first letter of each word in upper case          char ch           One of the characters in str          char prevCh       The character that comes before ch in the string          int i             A position in str  from 0 to str length  -1          prevCh            Prime the loop with any non-letter character          for   i   0   i  lt  str length     i                   ch   str charAt i               if   Character isLetter ch    amp  amp     Character isLetter prevCh                    System out print  Character toUpperCase ch                 else                 System out print  ch                prevCh   ch      prevCh for next iteration is ch                    System out println                   end class

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package com raj samplestring           author gnagara     public class SampleString                    param args             public static void main String   args           String   stringArray         String givenString    ramu is Arr Good boy           stringArray   givenString split                for int i 0  i lt stringArray length i                if  Character isUpperCase stringArray i  charAt 0                    Character c   stringArray i  charAt 0                  Character change   Character toUpperCase c                   StringBuffer ss   new StringBuffer stringArray i                   ss insert 0  change                  ss deleteCharAt 1                  stringArray i   ss toString                                 for String e stringArray              System out println e

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Here s a very simple  compact solution   str contains the variable of whatever you want to do the upper case on   StringBuilder b   new StringBuilder str   int i   0  do     b replace i  i   1  b substring i i   1  toUpperCase       i    b indexOf      i    1    while  i  gt  0  amp  amp  i  lt  b length      System out println b toString       It s best to work with StringBuilder because String is immutable and it s inefficient to generate new strings for each word

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String s    java is an object oriented programming language              final StringBuilder result   new StringBuilder s length             String words     s split            space found then split it       for  int i   0  i  lt  words length  i                    if  i  gt  0       result append                    result append Character toUpperCase words i  charAt 0    append                  words i  substring 1                   System out println result       Output  Java Is An Object Oriented Programming Language

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Here is the code      String source    hello good old world       StringBuffer res   new StringBuffer         String   strArr   source split           for  String str   strArr            char   stringArray   str trim   toCharArray            stringArray 0    Character toUpperCase stringArray 0            str   new String stringArray            res append str  append                  System out print  Result      res toString   trim

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public String UpperCaseWords String line        line   line trim   toLowerCase        String data     line split    s        line           for int i  0 i lt  data length i                  if data i  length   gt 1              line   line   data i  substring 0 1  toUpperCase   data i  substring 1               else             line   line   data i  toUpperCase              return line trim

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Have a look at ACL WordUtils   WordUtils capitalize  your string       Your String

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import org apache commons lang WordUtils   public class CapitalizeFirstLetterInString       public static void main String   args               only the first letter of each word is capitalized          String wordStr   WordUtils capitalize  this is first WORD capital test               Capitalize method capitalizes only first character of a String         System out println  wordStr      wordStr            wordStr   WordUtils capitalizeFully  this is first WORD capital test                This method capitalizes first character of a String and make rest of the characters lowercase         System out println  wordStr       wordStr              Output    This Is First WORD Capital Test   This Is First Word Capital Test

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public class WordChangeInCapital      public static void main String    args             String s  this is string example         System out println s           this is input data          this example for a string where each word must be started in capital letter       StringBuffer sb new StringBuffer s         int i 0        do          b replace i i 1 sb substring i i 1  toUpperCase             i b indexOf     i  1          while i gt 0  amp  amp  i lt sb length           System out println sb length

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i dont know if there is a function but this would do the job in case there is no exsiting one   String s    here are a bunch of words    final StringBuilder result   new StringBuilder s length     String   words   s split    s    for int i 0 l words length i lt l   i      if i gt 0  result append               result append Character toUpperCase words i  charAt 0             append words i  substring 1

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My code after reading a few above answers          Returns the given underscored word group as a Human Readable Word Group      Underscores are replaced by spaces and capitalized following words           param pWord               String to be made more readable     return Human-readable string     public static String humanize2 String pWord        StringBuilder sb   new StringBuilder        String   words   pWord replaceAll           split    s        for  int i   0  i  lt  words length  i                  if  i  gt  0              sb append               if  words i  length    gt  0                        sb append Character toUpperCase words i  charAt 0                 if  words i  length    gt  1                                sb append words i  substring 1                                      return sb toString

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Also you can take a look into StringUtils library  It has a bunch of cool stuff

[java] How to upper case every first letter of word in a string?

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