Java String split removed empty values

Question

I am trying to split the Value using a separator  But I am finding the surprising results  String data    5 6 7  8 9     String   split   data split         System out println split length     I am expecting to get 8 values   5 6 7 EMPTY 8 9 EMPTY EMPTY  But I am getting only 6 values   Any idea and how to fix  No matter EMPTY value comes at anyplace  it should be in array

User · Accepted Answer

split delimiter  by default removes trailing empty strings from result array  To turn this mechanism off we need to use overloaded version of split delimiter  limit  with limit set to negative value like String   split   data split  quot     quot   -1    Little more details  split regex  internally returns result of split regex  0  and in documentation of this method you can find  emphasis mine   The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array  If the limit n is greater than zero then the pattern will be applied at most n - 1 times  the array s length will be no greater than n  and the array s last entry will contain all input beyond the last matched delimiter  If n is non-positive then the pattern will be applied as many times as possible and the array can have any length  If n is zero then the pattern will be applied as many times as possible  the array can have any length  and trailing empty strings will be discarded   Exception  It is worth mentioning that removing trailing empty string makes sense only if such empty strings ware created by split mechanism  So for  quot  quot  split anything  since we can t split  quot  quot  farther we will get as result   quot  quot   array  It happens because split didn t happen here  so  quot  quot  despite being empty and trailing represents original string  not empty string which was created by splitting process

User · Answer

String   split   data split       -1    This is not the actual requirement in all the time  The Drawback of above is show below   Scenerio 1  When all data are present      String data    5 6 7  8 9 10        String   split   data split             String   splt   data split       -1       System out println split length     output  7     System out println splt length     output  8   When data is missing   Scenerio 2  Data Missing     String data    5 6 7  8          String   split   data split             String   splt   data split       -1       System out println split length     output  5     System out println splt length     output  8   Real requirement is length should be 7 although there is data missing  Because there are cases such as when I need to insert in database or something else  We can achieve this by using below approach       String data    5 6 7  8          String   split   data split             String   splt   data replaceAll            split       -1       System out println split length     output  5     System out println splt length     output 7   What I ve done here is  I m removing     pipe  at the end and then splitting the  String  If you have     as a seperator then you need to add      inside replaceAll

User · Answer

From the documentation of String split String regex       This method works as if by invoking the two-argument split method with the given expression and a limit argument of zero  Trailing empty strings are therefore not included in the resulting array     So you will have to use the two argument version String split String regex  int limit  with a negative value   String   split   data split       -1     Doc      If the limit n is greater than zero then the pattern will be applied at most n - 1 times  the array s length will be no greater than n  and the array s last entry will contain all input beyond the last matched delimiter  If n is non-positive then the pattern will be applied as many times as possible and the array can have any length  If n is zero then the pattern will be applied as many times as possible  the array can have any length  and trailing empty strings will be discarded    This will not leave out any empty elements  including the trailing ones

User · Answer

you may have multiple separators  including whitespace characters  commas  semicolons  etc  take those in repeatable group with      like       String   tokens    a   b    c   d         split        t n r         you ll have 4 tokens -- a  b  c  d  leading separators in the source string need to be removed before applying this split   as answer to question asked   String data    5 6 7  8 9     String   split   data split        t n r        whitespaces added just in case if you ll have those as separators along with

User · Answer

From String split   API Doc      Splits this string around matches of the given regular expression    This method works as if by invoking the two-argument split method with   the given expression and a limit argument of zero  Trailing empty   strings are therefore not included in the resulting array    Overloaded String split regex  int  is more appropriate for your case

[java] Java String split removed empty values

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