Remove trailing comma from comma-separated string

Question

I got String from the database which have multiple commas       I want to remove the last comma but I can t really find a simple way of doing it   What I have  kushalhs  mayurvm  narendrabz   What I want  kushalhs  mayurvm  narendrabz

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String str    kushalhs   mayurvm   narendrabz         System out println str replaceAll                1

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Use Guava to normalize all your commas   Split the string up around the commas  throw out the empties  and connect it all back together   Two calls   No loops   Works the first time   import com google common base Joiner  import com google common base Splitter   public class TestClass        Splitter splitter   Splitter on      omitEmptyStrings   trimResults        Joiner joiner   Joiner on      skipNulls         public String cleanUpCommas String string            return joiner join splitter split string                public class TestMain        public static void main String   args            TestClass testClass   new TestClass             System out println testClass cleanUpCommas  a b c d e             System out println testClass cleanUpCommas  a b c d e                  System out println testClass cleanUpCommas  a b     c d     e                  System out println testClass cleanUpCommas  a b c d   e                  System out println testClass cleanUpCommas          a b c d   e                     Output   a b c d e a b c d e a b c d e a b c d e a b c d e  Personally  I hate futzing around with counting limits of substrings and all that nonsense

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package com app   public class SiftNumberAndEvenNumber        public static void main String   args             int arr      1 2 3 4 5           int arr1     new int arr length           int shiftAmount 3                   for int i   0  i  lt  arr length  i                 int newLocation    i    arr length - shiftAmount     arr length              arr1 newLocation    arr i                                  for int i 0 i lt arr1 length i                  if i  arr1 length-1                    System out print arr1 i                 else                   System out print arr1 i   quot   quot                                    System out println            for int i 0 i lt arr1 length i                  if arr1 i  2  0                    System out print arr1 i   quot   quot

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Or something like this   private static String myRemComa String input             String   exploded   input split               input             boolean start   true          for String str   exploded              str str trim             if  str length   gt 0                 if  start                     input   str                      start   false                    else                       input   input         str                                                  return input

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You can do something like this using  Java 8   private static void appendNamesWithComma         List lt String gt  namesList   Arrays asList  test1    tester2    testers3    t4        System out println namesList stream                                    collect Collectors joining

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Check if  str charAt str length   -1           Then do  str   str substring 0  str length  -1

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To remove the      part which is immediately followed by end of string  you can do   str   str replaceAll               This handles the empty list  empty string  gracefully  as opposed to lastIndexOf   substring solutions which requires special treatment of such case   Example code   String str    kushalhs  mayurvm  narendrabz     str   str replaceAll             System out println str       prints  kushalhs  mayurvm  narendrabz      NOTE  Since there has been some comments and suggested edits about the       part  The expression should match the trailing part that you want to remove    If your input looks like  a b c    use       If your input looks like  a  b  c     use        If your input looks like  a   b   c      use           I think you get the point

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And one more     this also cleans internal commas mixed with whitespace   From          one       two  three        four          to one two  three  four  text replaceAll        s        s          replaceAll        s

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For more than one commas              String names    Hello World          System out println names replaceAll                  Output  Hello World

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I m late on this thread but hope it will help to some one         String abc    kushalhs   mayurvm   narendrabz      if abc indexOf         -1       abc   abc substring 0 abc length   - 1

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You can use this   String abc    kushalhs   mayurvm   narendrabz     String a   abc substring 0  abc lastIndexOf

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You can do something like using join function of String class   import java util Arrays  import java util List   public class Demo        public static void main String   args            List lt String gt  items   Arrays asList  Java    Ruby    Python    C              String output   String join      items           System out println output

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public static String removeExtraCommas String entry        if entry  null          return null       String ret         entry entry replaceAll    s           String arr   entry split           boolean start true      for String str arr            if     equalsIgnoreCase str                 if start                    ret str                  start false                            else               ret ret     str                                                   return ret

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i am sharing code form my project using regular expression you can do this     String ChildBelowList            if   Childbelow isEmpty              for  int iCB   0  iCB  lt  Childbelow size    iCB                   ChildBelowList   ChildBelowList    Childbelow get iCB                              ChildBelowList   ChildBelowList replaceAll       s          s       s      s        s          s                    tv childbelow setText ChildBelowList          else           ll childbelow setVisibility View GONE

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s        s      s     s       s        s      Regexr  ex   a  b  c    a  b  c    a  b  c       a  b  c        a  b  c           a  b  c           a  b  c      a  b  c      a  b  c       a  b  c        a  b  c            a  b  c                a  b  c            a  b  c         a  b  c        a  b  c      becomes   a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c a  b  c

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This method is in BalusC s StringUtil class  his blog  i use it very often and will trim any string of any value          Trim the given string with the given trim value      param string The string to be trimmed      param trim The value to trim the given string off      return The trimmed string      public static String trim String string  String trim        if  string    null            return null             if  trim length      0            return string             int start   0      int end   string length        int length   trim length         while  start   length  lt   end  amp  amp  string substring              start  start   length  equals trim             start    length            while  start   length  lt   end  amp  amp  string substring              end - length  end  equals trim             end -  length             return string substring start  end       ex   trim  1  2  3

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You can try with this  it worked for me   if  names endsWith             names   names substring 0  names length   - 1       Or you can try with this too   string   string replaceAll

[java] Remove trailing comma from comma-separated string

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