Checking the object for null value

Question

I have an object S, which contains the method called getstaus(). Now the value of the status coming from the backend could be null also, so I am checking through the following way:

if (S.getStatus().equals(null)) 
{}

Please let me know it is the correct approach or not or is there any other better approach than this.

@Lutz Horn Please _do not_ edit posts to change the coding style to your personal preference. Your edit should never have been approved. — Lundin, May 27 '13 at 06:58
@JoachimSauer ok ..removed comment but I think I can't undo my vote for close. — Grijesh Chauhan, May 27 '13 at 07:08

score 11 · Answer 1 · answered May 27 '13 at 06:54

11

Your code will throw a NullPointerException if getStatus() returns null, because you're trying to call a method on a reference that is null. Remember: equals() is a method just like any other, so it requires a non-null reference.

You need to use this:

if (s.getStatus() == null) {
  // oh no! the status is null!
}

answered May 27 '13 at 06:54

Joachim Sauer

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+1 for the "oh no!" comment. – Maroun May 27 '13 at 06:55

score 1 · Answer 2 · answered May 27 '13 at 06:54

1

try checking like this

if(S.getStatus() == null){
 //You will stop here by exception
}

answered May 27 '13 at 06:54

PSR

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Checking the object for null value

2 Answers2