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("\\|", -1);
Little more details:
split(regex) internally returns result of
split(regex, 0) and in documentation of this method you can find (emphasis mine)
limitparameter controls the number of times the pattern is applied and therefore affects the length of the resulting array.
If the limit
nis 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.
nis non-positive then the pattern will be applied as many times as possible and the array can have any length.
nis 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.
It is worth mentioning that removing trailing empty string makes sense only if such empty strings were created by the split mechanism. So for
"".split(anything) since we can’t split
"" farther we will get as result
It happens because split didn’t happen here, so
"" despite being empty and trailing represents original string, not empty string which was created by splitting process.