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[java] Alternate IF statement

Started by Jonbca Oct 1, 2002 at 3:27 PM 7 replies 450+ views

Original Post

Oct 1, 2002 at 3:27 PM

ok, I''m making a database for my programming class and I want to be able to check a variable using the ? method in c++ but I don''t know how to do it. Actually, I''m not even sure you''re aloud to. The syntex in c++ is:

  
arg1 = arg2 ? returnSomeThing: orSomeThingElse

I think I''ve seen it in a java program somewhere, but I''m not sure. ANy help would be appreciated.

WayfarerX

Oct 1, 2002 at 3:44 PM

Works just like C++.


Object value = getSomeValue();
String result = value == null ? "value-is-null" : "value-is-not-null";

[edited by - wayfarerx on October 1, 2002 4:46:10 PM]

Jonbca

Author

Jonbca

Oct 1, 2002 at 3:56 PM

I tried to do something pretty similar to that. I''m going

state[4]==1 ? search.Show(true):search.Show(false);

but I''m getting an invalid assignment error on the ==

???

dede

Oct 1, 2002 at 4:01 PM

= is the assignment operator

== is the boolean operator

WayfarerX

Oct 1, 2002 at 4:03 PM

From http://java.sun.com/docs/books/jls/second_edition/html/expressions.doc.html#290293

quote:
Note that it is not permitted for either the second or the third operand expression to be an invocation of a void method. In fact, it is not permitted for a conditional expression to appear in any context where an invocation of a void method could appear (§14.8).

Is that what you're doing? Also, wouldn't this be a little more concise in your scenerio?

search.Show(state[4] == 1);

[edited by - wayfarerx on October 1, 2002 5:04:06 PM]

Jonbca

Author

Jonbca

Oct 1, 2002 at 4:19 PM

thanks a lot. Both of my methods were a void return so that way of doing it wouldn''t work. Thanks for the

search.Show(state[4]==1)

idea. Wow, can you say blond moment, gotta love missing something that easy.

Viro

Oct 2, 2002 at 4:24 AM

quote:
Original post by Anonymous Poster
I hate this syntax....it''s obfuscated and JAVA would be a better (cleaner) language without it. I don''t find much other cryptic stuff in JAVA, so why this sh**?

What so obfuscated about that? Besides, if you don''t like it, you could do something else.


if(state[4]==1)
	search.show(true);
else
	search.show(false);

I suppose its a matter of preference. I''d still prefer the original syntax because it is more concise.

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