Comments on: Java ?: operator

By: suvi

suvi — Tue, 28 Feb 2012 10:27:38 +0000

instead of
int foo = bar ? a : b;
this
var== expression ? a: b;

By: Francis

Francis — Fri, 15 Apr 2011 12:10:25 +0000

Thanks, you turned Chinese into something understandable ;-)

By: D

Fri, 28 Jan 2011 02:15:39 +0000

Returning null makes Baby Jesus cry.

By: Guido

Guido — Thu, 28 Oct 2010 09:32:34 +0000

Nice explanation, thanks.

By: Marcel

Marcel — Fri, 05 Mar 2010 13:55:18 +0000

Thanks, I understand this!

By: span

span — Mon, 21 Sep 2009 06:29:57 +0000

Thanks for the clear explanation :)

By: wanacas

wanacas — Tue, 19 May 2009 14:15:30 +0000

This works:
System.out.println(boolean ? “Some text” : “Some other text”);

By: test

test — Tue, 02 Sep 2008 10:37:08 +0000

another advantage that it will not excute statement1:statement2 only the correct one

By: Patrick

Patrick — Wed, 05 Dec 2007 21:45:06 +0000

Ya thanks, it make sense.

By: Luke Maciak

Luke Maciak — Wed, 05 Dec 2007 21:29:00 +0000

Well, that is the one way you are not supposed to use the question mark statement. This statement is supposed to evaluate the boolean, and based on it’s value return the result of the statement to the left or the right of the colon.

In other words, the two statements are required to return a value. Since println() is void, I believe this syntax will throw error. So you are right, in your example, the if statement is definitely the correct approach.

To put it more simply, the question mark statement must evaluate to (or return) a value of some sort. It is not supposed to be used to perform an action.

I hope that makes sense. :)