Understanding the ? notation for Java

Question

I came across a code snippet online that used a notation that from what I gather seems to do a comparison and then returns back possible multiple outputs. I am still confused about it, even after research. Can someone re-write the code snippet to an equivalent, more basic version so that I can make sure I am understanding what I am seeing?

int mPart = i < mParts.length ? Integer.parseInt(mParts[i]) : 0;

Thanks in advance!

http://en.wikipedia.org/wiki/%3F: This is not exclusive to java. it's used in MANY languages. — Marc B, Feb 23 '15 at 20:32
I even don't know which point in "close" menu to select for this question... — Andremoniy, Feb 23 '15 at 20:34
I did. Examples work better for me. When I can see the equivalent in a different context, instead of reading an explanation. Sorry I do not learn same as you. — portfoliobuilder, Feb 23 '15 at 20:35
@portfoliobuilder Nearly every single page that turns up as a result for that google search shows examples... — tnw, Feb 23 '15 at 20:36

score 1 · Accepted Answer · answered Feb 23 '15 at 20:33

1

This is ternary IF operator. This line is equal to

int mPart;
if(i < mParts.length) {
   mPart = Integer.parseInt(mParts[i]);
} else {
   mPart = 0;
}

answered Feb 23 '15 at 20:33

dpassy

363
1
10

With the additional bonus that in the case of the ternary operator you can make 'mPart' final – tilois Feb 23 '15 at 20:35
3

It's the _conditional operator_ which is a _ternary operator._ There is no "ternary if" operator. – Matt Ball Feb 23 '15 at 20:35
Even still, he introduced to me a new term. I had not learned of ternary yet. I will accept this answer when I can. – portfoliobuilder Feb 23 '15 at 20:38

Understanding the ? notation for Java

1 Answers1