MCQ IN COMPUTER SCIENCE & ENGINEERING

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COMPUTER SCIENCE AND ENGINEERING

SOFTWARE ENGINEERING

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Recall that the null object pattern performs a no-op at each method call where null would otherwise be dereferenced. One advantage is that this is more efficient than checking, at each method invocation, whether the receiver ( the this object on which the method is being invoked) is null.
A
True
B
False
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -Solution: This can be remedied by updating the trigger and adding a null value check before accessing the field. Still experiencing the error? Shoot our 24/7 Customer Support, together with the Salesforce trigger code, so we can try to check which part causes the NullPointerException.

Detailed explanation-2: -Calling a method on a $null object throws a RuntimeException .

Detailed explanation-3: -In Salesforce CPQ, the error ‘Attempt to de-reference null object’ is caused by a line of code that is searching for a value that does not exist because a particular field value is null. This error can also occur when a required Look-up field is missing a record value.

Detailed explanation-4: -If you call a static method on an object with a null reference, you won’t get an exception and the code will run. This is admittedly very misleading when reading someone else’s code, and it is best practice to always use the class name when calling a static method.

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