How to remove single character from a String

Question

For accessing individual characters of a String in Java  we have String charAt 2   Is there any inbuilt function to remove an individual character of a String in java    Something like this   if String charAt 1     String charAt 2        I want to remove the individual character at index 2

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In most use-cases using StringBuilder or substring is a good approach  as already answered   However  for performance critical code  this might be a good alternative          Delete a single character from index position  start  from the  target  String                 deleteAt  ABC   0  - gt   BC     deleteAt  ABC   1  - gt   B     deleteAt  ABC   2  - gt   C              public static String deleteAt final String target  final int start        return deleteAt target  start  start   1               Delete the characters from index position  start  to  end  from the  target  String                 deleteAt  ABC   0  1  - gt   BC     deleteAt  ABC   0  2  - gt   C     deleteAt  ABC   1  3  - gt   A              public static String deleteAt final String target  final int start  int end        final int targetLen   target length        if  start  lt  0            throw new IllegalArgumentException  start     start             if  end  gt  targetLen    end  lt  start            throw new IllegalArgumentException  end     end             if  start    0            return end    targetLen        target substring end         else if  end    targetLen            return target substring 0  start             final char   buffer   new char targetLen - end   start       target getChars 0  start  buffer  0       target getChars end  targetLen  buffer  start       return new String buffer

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One possibility   String result   str substring 0  index    str substring index 1     Note that the result is a new String  as well as two intermediate String objects   because Strings in Java are immutable

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To modify Strings  read about StringBuilder because it is mutable except for immutable String  Different operations can be found here https   docs oracle com javase tutorial java data buffers html  The code snippet below creates a StringBuilder and then append the given String and then delete the first character from the String and then convert it back from StringBuilder to a String   StringBuilder sb   new StringBuilder     sb append str   sb deleteCharAt 0   str   sb toString

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You may also use the  huge  regexp machine   inputString   inputString replaceFirst    s    2            1 2          s     - tells regexp to handle newlines like normal characters  just in case       2    - group  1 collecting exactly 2 characters          - any character at index 2  to be squeezed out            - group  2 which collects the rest of the inputString    1 2    - putting group  1 and group  2 together

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If you need some logical control over character removal  use this  String string    sdsdsd   char   arr   string toCharArray       Run loop or whatever you need String ss   new String arr     If you don t need any such control  you can use what Oscar orBhesh mentioned  They are spot on

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Consider the following code   public String removeChar String str  Integer n        String front   str substring 0  n       String back   str substring n 1  str length         return front   back

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Yes  We have inbuilt function to remove an individual character of a string in java  that is  deleteCharAt  For example   public class StringBuilderExample       public static void main String   args              StringBuilder sb   new StringBuilder  helloworld          System out println  Before       sb         sb   sb deleteCharAt 3         System out println  After       sb            Output  Before   helloworld After   heloworld

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To Remove a Single character from The Given String please find my method hope it will be usefull  i have used str replaceAll to remove the string but their are many ways to remove a character from a given string but i prefer replaceall method   Code For Remove Char   import java util ArrayList  import java util Collection  import java util Collections    public class Removecharacter         public static void main String   args                 String result   removeChar  Java    a            String result1   removeChar  Edition    i              System out println result         result1                public static String removeChar String str  char c            if  str    null                        return null                    else                      return str replaceAll Character toString c                              Console image    please find The Attached image of console     Thanks For Asking

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public String missingChar String str  int n      String front   str substring 0  n       Start this substring at n 1 to omit the char     Can also be shortened to just str substring n 1     which goes through the end of the string   String back   str substring n 1  str length       return front   back

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You can also use the StringBuilder class which is mutable   StringBuilder sb   new StringBuilder inputString     It has the method deleteCharAt    along with many other mutator methods   Just delete the characters that you need to delete and then get the result as follows   String resultString   sb toString      This avoids creation of unnecessary string objects

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Easiest way to remove a char from string   String str  welcome   str str replaceFirst String valueOf str charAt 2          l  will replace with     System out println str    output  wecome

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BufferedReader input new BufferedReader new InputStreamReader System in       String line1 input readLine       String line2 input readLine             char    a line2 toCharArray              char   b line1 toCharArray               loop  for int t 0 t lt a length t                   char a1 a t              for int t1 0 t1 lt b length t1                     char b1 b t1                    if a1  b1                       StringBuilder sb   new StringBuilder line1                      sb deleteCharAt t1                      line1 sb toString                       b line1 toCharArray                       list add a1                      continue  loop

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public class RemoveCharFromString       public static void main String   args            String output   remove  Hello    l            System out println output              private static String remove String input  char c             if  input    null    input length    lt   1              return input          char   inputArray   input toCharArray            char   outputArray   new char inputArray length           int outputArrayIndex   0          for  int i   0  i  lt  inputArray length  i                  char p   inputArray i               if  p    c                    outputArray outputArrayIndex    p                  outputArrayIndex                                     return new String outputArray  0  outputArrayIndex

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public static String removechar String fromString  Character character        int indexOf   fromString indexOf character       if indexOf  -1           return fromString      String front   fromString substring 0  indexOf       String back   fromString substring indexOf 1  fromString length         return front back

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When I have these kinds of questions I always ask   what would the Java Gurus do       And I d answer that  in this case  by looking at the implementation of String trim     Here s an extrapolation of that implementation that allows for more trim characters to be used   However  note that original trim actually removes all chars that are  lt        so you may have to combine this with the original to get the desired result   String trim String string  String toTrim           input checks removed     if  toTrim length      0          return string       final char   trimChars   toTrim toCharArray        Arrays sort trimChars        int start   0      int end   string length         while  start  lt  end  amp  amp           Arrays binarySearch trimChars  string charAt start    gt   0          start         while  start  lt  end  amp  amp           Arrays binarySearch trimChars  string charAt end - 1    gt   0          end--       return string substring start  end

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I just implemented this utility class that removes a char or a group of chars from a String  I think it s fast because doesn t use Regexp  I hope that it helps someone  package your package name          Utility class that removes chars from a String          public class RemoveChars        public static String remove String string  String remove            return new String remove string toCharArray    remove toCharArray                 public static char   remove final char   chars  char   remove             int count   0          char   buffer   new char chars length            for  int i   0  i  lt  chars length  i                   boolean include   true              for  int j   0  j  lt  remove length  j                      if   chars i     remove j                          include   false                      break                                               if  include                    buffer count      chars i                                    char   output   new char count           System arraycopy buffer  0  output  0  count            return output                        For tests              public static void main String   args             String string    quot THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG quot           String remove    quot AEIOU quot            System out println            System out println  quot Remove AEIOU   quot    string           System out println  quot Result         quot    RemoveChars remove string  remove             This is the output  Remove AEIOU  THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG Result        TH QCK BRWN FX JMPS VR TH LZY DG

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String str    M1y java8 Progr5am     deleteCharAt    StringBuilder build   new StringBuilder str   System out println  Pre Builder       build       build deleteCharAt 1       Shift the positions front      build deleteCharAt 8-1       build deleteCharAt 15-2   System out println  Post Builder       build     replace    StringBuffer buffer   new StringBuffer str       buffer replace 1  2          Shift the positions front      buffer replace 7  8           buffer replace 13  14       System out println  Buffer     buffer     char    char   c   str toCharArray    String new Str           for  int i   0  i  lt  c length  i              if    i    1    i    8    i    15                new Str    c i         System out println  Char Array     new Str

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No  because Strings in Java are immutable  You ll have to create a new string removing the character you don t want   For replacing a single char c at index position idx in string str  do something like this  and remember that a new string will be created   String newstr   str substring 0  idx    str substring idx   1

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You can delete string value use the StringBuilder and deletecharAt   String s1    aabc   StringBuilder sb   new StringBuilder s1   for int i 0 i lt sb length   i        char temp   sb charAt 0     if sb indexOf temp      1                                       sb deleteCharAt sb indexOf temp

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If you want to remove a char from a String str at a specific int index       public static String removeCharAt String str  int index                The part of the String before the index          String str1   str substring 0 index               The part of the String after the index                      String str2   str substring index 1 str length                 These two parts together gives the String without the specified index         return str1 str2

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By the using replace method we can change single character of string   string  string replace

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You can use Java String method called replace  which will replace all characters matching the first parameter with the second parameter   String a    Cool   a   a replace  o

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Use replaceFirst function of String class  There are so many variants of replace function that you can use

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For example if you want to calculate how many a s are there in the String  you can do it like this   if  string contains  a          numberOf a        string   string replaceFirst  a

[java] How to remove single character from a String

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