Are concatenated conditions (in "if", "for" or "while" loop) ALWAYS completely evaluated?

[Robin Wenger]

Assume I setup a condition with multiple concatenated sub-conditions like:

for (i=0; i < othervar && myobj != null && i > myobj.getValue(); i++) { ...}

or

if (i < othervar && myobj != null && i > myobj.getValue()) { ... }

are all these sub-conditions ALWAYS evaluated?

Refering to the sample above: If i is GREATER than othervar is then still checked if myobj != null?

Robin

 

[Joshua Cranmer]

Assume I setup a condition with multiple concatenated sub-conditions like:

for (i=0; i< othervar&& myobj != null&& i> myobj.getValue(); i++) { ...}

or

if (i< othervar&& myobj != null&& i> myobj.getValue()) { ... }

are all these sub-conditions ALWAYS evaluated?

The && and || are what is known as "short-circuit operators". This means
that when the result of the operation is known, they do not execute the
rest of the expression. So, for &&, if the first expression is false,
the other expressions are not evaluated; for ||, if the first expression
is true, the other expressions are not evaluated.

This is must heavily used with, e.g.:
if (param != null && param.getFoo() == 10)


Also, if you cross-post to multiple newsgroups and only have the
follow-up set to one, PLEASE indicate that in the body of your text. Or
better yet, don't do it all--news servers and newsreaders are designed
to handle cross-posted messages properly.

 

[Lew]

Also, if you cross-post [sic] to multiple newsgroups and only have the follow-up set
to one, PLEASE indicate that in the body of your text. Or better yet, don't do
it all--news servers and newsreaders are designed to handle cross-posted
messages properly.

What is this sudden flood of cross-posted messages recently?

It's not necessary, especially not in comp.lang.java.**.

It's annoying to enthusiastically answer a question only to find that the
thrust of the conversation is in a different newsgroup. It can also confuse,
when one doesn't notice the f/u and wonders why their answer hasn't shown up.

 

[Arne Vajhøj]

What is this sudden flood of cross-posted messages recently?

It's not necessary, especially not in comp.lang.java.**.

It's annoying to enthusiastically answer a question only to find that
the thrust of the conversation is in a different newsgroup. It can also
confuse, when one doesn't notice the f/u and wonders why their answer
hasn't shown up.

Its must be in fashion right now.

But I agree that it is nuisance.

Arne