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Salesforce is a cloud-based software company that provides customer relationship management (CRM) solutions. One of the primary features of Salesforce is the ability to customize and extend its capabilities through programming. Salesforce offers a certification exam known as the DEX-450, which is designed for developers who want to demonstrate their expertise in programmatic development using Apex and Visualforce in Lightning Experience.

Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q171-Q176):

NEW QUESTION # 171
While writing an Apex class, a developer wants to make sure that all functionality being developed is handled as specified by the requirements.
Which approach should the developer use to be sure that the Apex class is working according to specifications?

A. Create a test class to execute the business logic and run the test in the Developer Console.
B. Include a savepoint and Database.rollback().
C. Include a try/catch block to the Apex class.
D. Run the code in an Execute Anonymous block in the Developer Console.

Answer: A

Explanation:
To ensure that the Apex class is functioning according to the specified requirements, the developer should write a test class that executes the business logic and verifies that it behaves as expected.
Option A: Create a test class to execute the business logic and run the test in the Developer Console.
Correct Approach.
Writing a test class allows the developer to create unit tests that verify the functionality of the Apex class.
Test methods can assert that the class behaves as intended under various conditions, ensuring compliance with requirements.
Running the test in the Developer Console allows the developer to see the results and debug if necessary.
Benefits:
Automated Testing: Ensures repeatability and consistency in testing.
Code Coverage: Helps achieve required code coverage for deployment.
Regression Testing: Facilitates detection of future changes that might break existing functionality.
While running code in Execute Anonymous allows for quick tests, it is not suitable for thorough testing.
It doesn't provide assertions to verify that the output matches expected results.
Tests run in Execute Anonymous are not saved and cannot be rerun easily for regression testing.
Using savepoints and rollbacks can help in testing DML operations without committing changes to the database.
However, this doesn't ensure that the class meets the functional requirements.
Adding try/catch blocks can handle exceptions but does not verify that the class functions as specified.
Exception handling is a part of robust code but doesn't replace the need for testing.
Reference:
Testing Apex
Best Practices for Unit Testing
Option B: Run the code in an Execute Anonymous block in the Developer Console.
Less Effective.
Anonymous Blocks
Option C: Include a savepoint and Database.rollback().
Not Sufficient.
Using Savepoints and Rollbacks
Option D: Include a try/catch block to the Apex class.
Not Sufficient.
Exception Handling in Apex
Conclusion:
Writing a test class is the best way to ensure that the Apex class works according to the specifications.
Test classes allow for comprehensive testing with assertions, providing confidence that the code meets the requirements.

NEW QUESTION # 172
Which two settings must be defined in order to update a record of a junction object? Choose 2 answers

A. Read/Write access on the primary relationship
B. Read access on the primary relationship
C. Read/Write access on the secondary relationship
D. Read/Write access on the junction object

Answer: A,C

NEW QUESTION # 173
Which two events need to happen when deploying to a production org?
Choose 2 answers

A. All Visual flows must have at least 1% test coverage.
B. All custom objects must have visibility set to a value other than in Development.
C. All Apex code must have at least 75% test coverage.
D. All triggers must have some test coverage

Answer: C,D

NEW QUESTION # 174
When the code executes, a DML exception is thrown.
How should a developer modify the code to ensure exceptions are handled gracefully?

A. Implement Change Data Capture.
B. Implement the upset DML statement.
C. Implement a try/catch block for the DML.
D. Remove null items from the list of Accounts.

Answer: C

Explanation:
Why a try/catch block is required:
In Salesforce, DML operations such as insert, update, delete, and upsert can throw exceptions due to issues like validation rule violations, field constraints, or sharing rule restrictions.
Using a try/catch block ensures that these exceptions are caught and handled gracefully, preventing the entire transaction from failing.
How to modify the code:
The update statement in the code can be wrapped in a try/catch block to catch and handle any exceptions that occur. For example:
apex
Copy code
public static void insertAccounts(List<Account> theseAccounts) {
try {
for (Account thisAccount : theseAccounts) {
if (thisAccount.website == null) {
thisAccount.website = 'https://www.demo.com';
}
}
update theseAccounts;
} catch (DmlException e) {
System.debug('DML Exception: ' + e.getMessage());
}
}
Why not the other options?
A . Implement the upsert DML statement:
upsert is used to either insert or update records based on an external ID or primary key. It does not inherently handle exceptions.
B . Implement Change Data Capture:
Change Data Capture (CDC) is used for tracking changes to data in real time and is unrelated to handling DML exceptions.
D . Remove null items from the list of Accounts:
While cleaning the input data is a good practice, it does not address the need for exception handling during DML operations.
Reference:
Apex Error Handling
DML Operations in Apex

NEW QUESTION # 175
Which control statement should a developer use to ensure that a loop body executes at least once?

A. While (condition){}
B. For(init_stmt;exit_cond;increment){}
C. Do {} while (cond)
D. For(variable : list_or_set){}

Answer: C

NEW QUESTION # 176
......

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DEX-450 Accurate Prep Material, DEX-450 Updated Dumps

DEX-450 Updated Dumps & DEX-450 Valid Exam Review

Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q171-Q176):

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