Converting to upper and lower case in Java

Question

I want to convert the first character of a string to Uppercase and the rest of the characters to lowercase  How can I do it     Example   String inputval  ABCb  OR  a123BC DET  or  aBcd  String outputval  Abcb  or  A123bc det  or  Abcd

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WordUtils capitalizeFully str  from apache commons-lang has the exact semantics as required

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Try this on for size   String properCase  String inputVal           Empty strings should be returned as-is       if  inputVal length      0  return             Strings with only one character uppercased       if  inputVal length      1  return inputVal toUpperCase            Otherwise uppercase first letter  lowercase the rest       return inputVal substring 0 1  toUpperCase             inputVal substring 1  toLowerCase        It basically handles special cases of empty and one-character string first and correctly cases a two-plus-character string otherwise  And  as pointed out in a comment  the one-character special case isn t needed for functionality but I still prefer to be explicit  especially if it results in fewer useless calls  such as substring to get an empty string  lower-casing it  then appending it as well

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I consider this simpler than any prior correct answer  I ll also throw in javadoc   -          Converts the given string to title case  where the first    letter is capitalized and the rest of the string is in    lower case          param s a string with unknown capitalization     return a title-case version of the string     public static String toTitleCase String s        if  s isEmpty                  return s            return s substring 0  1  toUpperCase     s substring 1  toLowerCase        Strings of length 1 do not needed to be treated as a special case because s substring 1  returns the empty string when s has length 1

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String inputval  ABCb   String result   inputval substring 0 1  toUpperCase     inputval substring 1  toLowerCase      Would change  ABCb  to  Abcb

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This code is just for convert a single uppercase character to lowercase  character  amp  vice versa                        This code is made without java library function  and also uses run time input         import java util Scanner   class CaseConvert   char c  void input       SuppressWarnings  resource      only eclipse users   Scanner in  new Scanner System in      for Run time input System out print   n Enter Any Character      c in next   charAt 0          input a single character   void convert    if c gt  65  amp  amp  c lt  90       c  char   c 32       System out print  Converted to Lowercase    c     else if c gt  97 amp  amp c lt  122           c  char   c-32           System out print  Converted to Uppercase    c     else     System out println  invalid Character Entered      c          public static void main String   args           TODO Auto-generated method stub     CaseConvert obj new CaseConvert        obj input        obj convert                  OUTPUT  Enter Any Character  A Converted to Lowercase  a  Enter Any Character  a Converted to Uppercase  A Enter Any Character   invalid Character Entered

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String a    ABCD    using this  a toLowerCase      all letters will convert to simple   abcd  using this  a toUpperCase     all letters will convert to Capital   ABCD   this conver first letter to capital   a substring 0 1  toUpperCase     this conver other letter Simple         a substring 1  toLowerCase      we can get sum of these two  a substring 0 1  toUpperCase     a substring 1  toLowerCase      result    Abcd

[java] Converting to upper and lower case in Java

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