Exam CRT-450 topic 1 question 139 discussion

Actual exam question from Salesforce's CRT-450

Question #: 139
Topic #: 1

A developer has an integer variable called maxAttempts. The developer needs to ensure that once maxAttempts is initialized, it preserves its value for the length of the Apex transaction; while being able to share the variable's state between trigger executions.
How should the developer declare maxAttempts to meet these requirements?

A. Declare maxAttempts as a private static variable on a helper class.
B. Declare maxAttempts as a variable on a helper class.
C. Declare maxAttempts as a member variable on the trigger definition.
D. Declare maxAttempts as a constant using the static and final keywords.

Show Suggested Answer

Suggested Answer: D 🗳️

by semio at Feb. 26, 2023, 7:09 a.m.

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Brinuz

10 months, 1 week ago

Selected Answer: D

The answer is D

upvoted 3 times

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wjj

1 year ago

Selected Answer: A

To meet the given requirements, the developer should declare maxAttempts as a private static variable on a helper class. This approach ensures that the value of maxAttempts is preserved for the length of the Apex transaction, and it also allows the variable's state to be shared between trigger executions. Option (C) is not a good choice, as member variables on trigger definitions are not static and can be reset between trigger executions, which would violate the requirement of preserving the value of maxAttempts for the length of the transaction. Option (D) is not suitable, as a constant variable cannot be modified after initialization, and the requirement is to preserve the value of maxAttempts for the entire transaction. Option (B) is not a good choice either, as declaring maxAttempts on a helper class as a regular variable would not make it static, and its value would not be preserved for the length of the Apex transaction. Therefore, option (A) is the best choice for declaring maxAttempts to meet the given requirements

upvoted 2 times

briccoli11

11 months, 1 week ago

Thank you for your thorough explanation. I'm still a little confused why option D (Declare maxAttempts as a constant using the static and final keywords.) is not the answer, as the question says that "once maxAttempts is initialized, it [should] preserve its value for the length of the transaction." https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/langCon_apex_constants.htm ^ This source says that a variable with a final keyword can be assigned "with a static initializer method if the constant is defined in a class" Can you clarify why D would still be incorrect based off of this?

upvoted 1 times

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wjj

1 year ago

To meet the given requirements, the developer should declare maxAttempts as a private static variable on a helper class. This approach ensures that the value of maxAttempts is preserved for the length of the Apex transaction, and it also allows the variable's state to be shared between trigger executions. Option (A) is not a good choice, as member variables on trigger definitions are not static and can be reset between trigger executions, which would violate the requirement of preserving the value of maxAttempts for the length of the transaction. Option (C) is not suitable, as a constant variable cannot be modified after initialization, and the requirement is to preserve the value of maxAttempts for the entire transaction. Option (D) is not a good choice either, as declaring maxAttempts on a helper class as a regular variable would not make it static, and its value would not be preserved for the length of the Apex transaction. Therefore, option (B) is the best choice for declaring maxAttempts to meet the given requirements.

upvoted 1 times

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semio

1 year, 3 months ago

Selected Answer: D

https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/langCon_apex_constants.htm

upvoted 4 times

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