Re: checking for null Noob question
Re: checking for null Noob question
- Subject: Re: checking for null Noob question
- From: Jérémy DE ROYER <email@hidden>
- Date: Sat, 31 Jul 2010 14:13:18 +0200
So the answer is :
- "if the object is null, as, in the second test, your use the method 'equals' on this object (null) > NullPointerException"
On the first test, as you first test if the object is null, you can't have a NullPointerException
Hope this help,
Jérémy
Le 31 juil. 2010 à 14:09, Theodore Petrosky a écrit :
> Yes... I was asking 'Why?' is there a NullPointerException with number 2...
>
> Ted
>
>
> --- On Sat, 7/31/10, Jérémy DE ROYER <email@hidden> wrote:
>
>> From: Jérémy DE ROYER <email@hidden>
>> Subject: Re: checking for null Noob question
>> To: "Theodore Petrosky" <email@hidden>
>> Cc: email@hidden
>> Date: Saturday, July 31, 2010, 8:07 AM
>> I won't do the second one because you
>> could see a NullPointerException. Is it your question ?
>>
>> Jérémy
>>
>> Le 31 juil. 2010 à 14:05, Theodore Petrosky a écrit :
>>
>>>
>>> Why does this work:
>>>
>>> public String dueDateTypeLetter() {
>>>
>>> if (this.dueDateType() == null ||
>> this.dueDateType().equals("N")) {
>>> return "";
>>> }
>>> return this.dueDateType();
>>> }
>>>
>>> and this doesn't....
>>>
>>> public String dueDateTypeLetter() {
>>>
>>> if (this.dueDateType().equals("N") ||
>> this.dueDateType() == null) {
>>> return "";
>>> }
>>> return this.dueDateType();
>>> }
>>>
>>> obviously the difference is the order of checking in
>> the 'if' statement...
>>>
>>> I don't really care that I must check in a specific
>> order... It just took me time to understand that the order
>> was important.
>>>
>>> Ted
>>>
>>>
>>>
>>>
>>>
>>>
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>
>
>
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