Checking strings for empty

Question

Very tired this morning so if this is obvious then thats my excuse !!!

i am using a buffered reader to read through a csv file - but i dont want to add any empty spaces, as in

" "

the problem is - when i read the line i am checking if the string length is > 0, if so then add, however the string " " is of length 4 - even tho its empty

is there a better check i can do

thanks

flybywire · Accepted Answer · 2009-11-03 10:56:00Z

6

s.trim().isEmpty()

answered Nov 3, 2009 at 10:56

flybywire

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Karl · Accepted Answer · 2009-11-03 10:56:27Z

3

could trim the input :-)

trim()
      Returns a copy of the string, with leading and trailing whitespace omitted.

karl

answered Nov 3, 2009 at 10:56

Karl

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Adeel Ansari · Accepted Answer · 2009-11-03 11:40:01Z

2

I usually prefer, StringUtils of commons-lang, or something like that. Actually, you require this kinda check every now and then, plus there are few variants and all are null-safe. Namely, StringUtils.isBlank(String str), StringUtils.isNotBlank(String str), StringUtils.isEmpty(String str), StringUtils.isNotEmpty(String str), StringUtils.trimToEmpty(String str), and StringUtils.trimToNull(String str).

answered Nov 3, 2009 at 11:40

Adeel Ansari

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1 Comment

Andrzej Doyle Over a year ago

+1 for that - I use StringUtils.defaultString() (both the unary and binary versions) so often now that I feel it should be part of the language.

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