How to represent empty char in Java Character class

Question

I want to represent an empty character in Java as     in String     Like that char ch   an empty character   Actually I want to replace a character without leaving space    I think it might be sufficient to understand what this means  no character not even space

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As chars can be represented as Integers  ASCII-Codes   you can simply write   char c   0    The 0 in ASCII-Code is null

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char ch   Character MIN VALUE    The code above will initialize the variable ch with the minimum value that a char can have  i e   u0000

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char means exactly one character  You can t assign zero characters to this type   That means that there is no char value for which String replace char  char  would return a string with a diffrent length

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In java there is nothing as empty character literal  in other words     has no meaning unlike    which means a empty String literal  The closest you can go about representing empty character literal is through zero length char    something like   char   cArr                  cArr is a zero length array char   cArr   new char 0     this does the same   If you refer to String class its default constructor creates a empty character sequence using new char 0   Also  using Character MIN VALUE is not correct because it is not really empty character rather smallest value of type character   I also don t like Character c   null  as a solution mainly because jvm will throw NPE if it tries to un-box it  Secondly  null is basically a reference to nothing w r t reference type and here we are dealing with primitive type which don t accept null as a possible value   Assuming that in the string  say str  OP wants to replace all occurrences of a character  say  x   with empty character     then try using   str replace  x

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You can only re-use an existing character  e g   0 If you put this in a String  you will have a String with one character in it     Say you want a char such that when you do  String s    char ch     String s2   s   ch     there is not char which does this  assert s equals s2     what you have to do instead is  String s    char ch   MY NULL CHAR  String s2   ch    MY NULL CHAR   s   s   ch  assert s equals s2

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Use the  b operator  the backspace escape operator  in the second parameter  String test   Anna Banana    System out println test     returns Anna Banana lt br gt  lt br gt  System out println test replaceAll       b       returns AnnaBanana removing all the spaces in the string

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this is how I do it   char   myEmptyCharArray      toCharArray

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An empty String is a wrapper on a char   with no elements  You can have an empty char    But you cannot have an  empty  char  Like other primitives  a char has to have a value   You say you want to  replace a character without leaving a space    If you are dealing with a char    then you would create a new char   with that element removed   If you are dealing with a String  then you would create a new String  String is immutable  with the character removed   Here are some samples of how you could remove a char   public static void main String   args  throws Exception        String s    abcdefg       int index   s indexOf  d            delete a char from a char       char   array   s toCharArray        char   tmp   new char array length-1       System arraycopy array  0  tmp  0  index       System arraycopy array  index 1  tmp  index  tmp length-index       System err println new String tmp            delete a char from a String using replace     String s1   s replace  d            System err println s1           delete a char from a String using StringBuilder     StringBuilder sb   new StringBuilder s       sb deleteCharAt index       s1   sb toString        System err println s1

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I was looking for this  Simply set the char c   0  and it works perfectly  Try it   For example  if you are trying to remove duplicate characters from a String   one way would be to convert the string to char array and store in a hashset of characters which would automatically prevent duplicates   Another way  however  will be to convert the string to a char array  use two  for-loops and compare each character with the rest of the string char array  a Big O on N 2 activity   then for each duplicate found just set that char to 0       and use new String char    to convert the resulting char array to string and then sysout to print  this is all java btw   you will observe all chars set to zero are simply not there and all duplicates are gone  long post  but just wanted to give you an example   so yes set char c   0  or if for char array  set cArray i  0 for that specific duplicate character and you will have removed it

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String before   EMPTY SPACE TAB  quot word quot  TAB EMPTY SPACE Where EMPTY SPACE    quot   quot    this is String  TAB             t   this is Character  String after   before replaceAll  quot   quot    quot  quot   replace   t     0   means after    quot word quot

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Hey i always make methods for custom stuff that is usually not implemented in java  Here is a simple method i made for removing character from String Fast      public static String removeChar String str  char c           StringBuilder strNew new StringBuilder str length             char charRead          for int i 0 i lt str length   i                 charRead str charAt i               if charRead  c                  strNew append charRead                     return strNew toString            For explaintion  yes there is no null character for replacing  but you can remove character like this  I know its a old question  but i am posting this answer because this code may be helpful for some persons

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You can do something like this   mystring replace    ch

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You may assign   u0000   or 0   For this purpose  use Character MIN VALUE   Character ch   Character MIN VALUE

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As Character is a class deriving from Object  you can assign null as  instance    Character myChar   null    Problem solved

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You can t     is the literal for a string  which contains no characters  It does not contain the  empty character   whatever you mean by that

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If you want to replace a character in a String without leaving any empty space then you can achieve this by using StringBuilder  String is immutable object in java you can not modify it   String str    Hello   StringBuilder sb   new StringBuilder str   sb deleteCharAt 1      to replace e character

[java] How to represent empty char in Java Character class

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