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Salesforce DEX-450 Certification Exam is an essential certification for developers who want to work with Salesforce. It validates your skills and knowledge in programmatic development using Apex and Visualforce in Lightning Experience. Programmatic Development using Apex and Visualforce in Lightning Experience certification exam is also a prerequisite for advanced certifications, such as the Salesforce Certified Platform Developer II. Passing DEX-450 exam demonstrates your ability to build custom applications, automate processes, and integrate Salesforce with other systems.

Salesforce DEX-450 certification exam is designed to assess the knowledge and skills of developers who work with the Apex programming language and Visualforce framework. Programmatic Development using Apex and Visualforce in Lightning Experience certification is ideal for those who are familiar with Salesforce platform and want to enhance their skills in programmatic development using Apex and Visualforce in Lightning Experience. Passing DEX-450 Exam demonstrates that the candidate has a thorough understanding of the Salesforce platform and can develop custom business logic and user interfaces using Apex and Visualforce.

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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q39-Q44):

NEW QUESTION # 39
An Opportunity needs to have an amount rolled up from a custom object that is not in a master-detail relationship.
How can this be achieved?

A. Use the Metadata API to create real-time roll-up summaries.
B. Write a trigger on the Opportunity object and use tree sorting to sum the amount for all related child objects under the Opportunity.
C. Write a trigger on the child object and use an aggregate function to sum the amount for all related child objects under the Opportunity.
D. Use the Streaming API to create real-time roll-up summaries.

Answer: C

NEW QUESTION # 40
Where can the custom roll-up summary fields be created using Standard Object relationships (Choose 3)

A. On Account using Case records.
B. On Quote using Order records.
C. On Campaign using Campaign Member records.
D. On Opportunity using Opportunity Product records.
E. On Account using Opportunity records.

Answer: C,D,E

NEW QUESTION # 41
Which two statements can a developer use to throw a custom exception of type MissingFieldValueException? Choose 2 answers.

A. Throw new MissingFieldValueException ('Problem occurred');
B. Throw Exception (new MissingFieldValueException());
C. Throw new MissingFieldValueException();
D. Throw (MissingFieldValueException, 'Problem occurred');

Answer: A,C

NEW QUESTION # 42
A developer has a VF page and custom controller to save Account records. The developer wants to display any validation rule violation to the user. How can the developer make sure that validation rule violations are displayed?

A. Use a try/catch with a custom exception class.
B. Include <apex:messages> on the Visualforce page.
C. Add custom controller attributes to display the message.
D. Perform the DML using the Database.upsert() method

Answer: B

Explanation:
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_message.htm

NEW QUESTION # 43
A developer completed modifications to a customized feature that is comprised of two elements:
* Apex trigger
* Trigger handler Apex class
What are two factors that the developer must take into account to properly deploy the modification to the production environment?
Choose 2 answers

A. All methods in the test classes must use @isTest.
B. Apex classes must have at least 75% code coverage org-wide.
C. Test methods must be declared with the testMethod keyword.
D. At least one line of code must be executed for the Apex trigger.

Answer: B,D

Explanation:
When deploying Apex code to a production environment, certain requirements must be met regarding test coverage and annotations.
Option B: Apex classes must have at least 75% code coverage org-wide.
Correct Requirement.
Salesforce requires that all Apex classes and triggers have a combined code coverage of at least 75% before deployment to production.
This means that, across all Apex code in the org, at least 75% of the code must be covered by test methods.
Every trigger must have some test coverage, even if the overall code coverage is above 75%.
Specifically, triggers must have at least 1% code coverage.
Test methods should be annotated with @isTest.
However, it's not mandatory that all methods in a test class use @isTest; helper methods within test classes can be private or public methods without the annotation.
Only the test methods themselves need the @isTest annotation.
The testMethod keyword is deprecated but still supported.
The preferred approach is to use the @isTest annotation.
Using testMethod is not recommended for new code.
Reference:
Code Coverage Requirement
Option D: At least one line of code must be executed for the Apex trigger.
Correct Requirement.
Trigger Coverage Requirement
Options Not Suitable:
Option A: All methods in the test classes must use @isTest.
Partially Correct.
Defining Test Methods
Option C: Test methods must be declared with the testMethod keyword.
Outdated Practice.
Deprecated testMethod Keyword
Conclusion:
The two factors the developer must take into account are B (75% code coverage org-wide) and D (At least 1% coverage for triggers).
These are mandatory requirements for deploying Apex code to production.

NEW QUESTION # 44
......

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Pass Guaranteed Quiz 2025 DEX-450: Programmatic Development using Apex and Visualforce in Lightning Experience–Reliable Free Practice

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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q39-Q44):

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