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Index › Programming Questions & Help › Syntax Questions › Empty element in array of strings
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Empty element in array of strings? (Read 1205 times)
YoungS
Empty element in array of strings?
Apr 24th, 2009, 2:29pm  
Hi,

Say you have a tab-delimited file:

a TAB b TAB c
d TAB e TAB
f TAB g TAB h

note that the middle line has no value in the last element.

If I load this into an array of strings:
String foo[] = split(myfile, TAB);

The array for each line has a length of 3. The third element in the middle line shows up as a blank. I, however, don't know how to test for it. I have tried null, and "" and " " to no avail. Can anyone tell me how to test for this blank element?
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NoahBuddy
Re: Empty element in array of strings?
Reply #1 - Apr 24th, 2009, 2:57pm  
Test for foo.length

Arrays in Java have that built in. Smiley
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YoungS
Re: Empty element in array of strings?
Reply #2 - Apr 24th, 2009, 3:04pm  
I have. They are all the same length.
If I print out the array values I will see

[0] "d"
[1] "e"
[2] ""

But testing for "" or null doesn't seem to work.



NoahBuddy wrote on Apr 24th, 2009, 2:57pm:
Test for foo.length

Arrays in Java have that built in. Smiley

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PhiLho 
Re: Empty element in array of strings?
Reply #3 - Apr 25th, 2009, 1:11am  
You can test if a string is empty with either:

str.length() == 0

or

str.equals("")
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YoungS
Re: Empty element in array of strings?
Reply #4 - Apr 25th, 2009, 7:25pm  
Oh, that is brilliant. Thanks so much! You saved me some hair Smiley

PhiLho  wrote on Apr 25th, 2009, 1:11am:
You can test if a string is empty with either:

str.length() == 0

or

str.equals("")

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PhiLho 
Re: Empty element in array of strings?
Reply #5 - Apr 26th, 2009, 1:42am  
Two gentle remarks about general forum etiquette: not need to quote somebody just above your reply, unless you want to isolate a specific part of a long message, and avoid top-posting:
Quote:
Please do not top post. By this, we mean that if you are replying to a message, please put your replies after the text that you copy in your reply.
   * A: Because it reverses the logical flow of conversation.
   * Q: Why is top posting frowned upon
Mailing List Etiquette applies also to forums... Smiley

Just a reminder, to avoid a trap lot of new comers to Java fall into: don't compare strings with ==, always use equals().
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