CODEWITHSUNDEEP
java
asda
asda

Reputation: 153

Declare multiple String variables and initialize them to all to null at once

I want to declare all of them null. Am I doing someting wrong or is this the right method?

String a = null, b = null, c = null, d = null;

(Is there any more compact syntax for doing this?)

Upvotes: 14

Views: 49445

Answers (5)

lkisac
lkisac

Reputation: 2137

If you're setting it to null,

String a, b, c, d;

would be enough as the declaration would set it to null by default. See this thread for further explanation.

Otherwise if you're setting a, b, c, d to some value, you would have to use the solutions mentioned above.

Upvotes: 4

gulyan
gulyan

Reputation: 662

You may want something like this:

String a, b, c, d = a = b = c = null;

Upvotes: 9

aioobe
aioobe

Reputation: 420991

Yep. That's the way to do it.

You could also do

String a, b, c, d;
a = b = c = d = null;

The line below however won't compile:

String a = b = c = d = null;  // illegal

(Note that if these are member variables, they will be initialized to null automatically.)

Upvotes: 26

Paul Cager
Paul Cager

Reputation: 1920

Yes, that's how o do it.

However, if you find yourself writing that sort of construct often in might be a sign that you are declaring a variable too early, before you know what value to put in it:

http://www.javapractices.com/topic/TopicAction.do?Id=126

Edit: You might alsdo want to look at this:

http://www.javapractices.com/topic/TopicAction.do?Id=14

Upvotes: 2

tskuzzy
tskuzzy

Reputation: 36456

That's perfectly valid. I suppose a slightly shorter way of doing it is:

String a, b, c, d;
a = b = c = d = null;

Upvotes: 2

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