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Programmatic Development using Apex and Visualforce in Lightning Experience Practice Test

DEX-450 exam Format | Course Contents | Course Outline | exam Syllabus | exam Objectives

Exam Details for DEX-450 Programmatic Development using Apex and Visualforce in Lightning Experience:

Number of Questions: The exam typically consists of multiple-choice questions- with a total of approximately 60 questions.

Time Limit: The total time allocated for the exam is usually 105 minutes.

Passing Score: The passing score for the exam varies- but it is generally set around 65% or higher.

Exam Format: The exam is usually conducted in a proctored environment- either in-person or online.

Course Outline:

The DEX-450 Programmatic Development using Apex and Visualforce in Lightning Experience course covers the following key areas:

1. Apex Development:
- Introduction to Apex programming language
- Apex syntax- data types- and variables
- Control statements and loops in Apex
- Exception handling and error management
- Apex triggers and trigger context variables
- Apex classes and object-oriented programming
- Apex unit testing and code coverage

2. Visualforce Development:
- Introduction to Visualforce framework
- Visualforce markup and components
- Controller classes and controller extensions
- Standard and custom Visualforce controllers
- Visualforce binding and expression language
- Visualforce page navigation and actions
- Visualforce component development

3. Lightning Component Development:
- Introduction to Lightning Component Framework
- Lightning component architecture and design principles
- Component markup and styling
- Lightning Data Service and data access
- Component communication and event handling
- Lightning Aura components vs. Lightning Web Components

4. Integration and Web Services:
- Apex integration with external systems
- Web service callouts and SOAP/REST integration
- Integration patterns and best practices
- Authentication and security considerations

Exam Objectives:

The objectives of the DEX-450 exam are to assess the candidate's understanding of the following:

1. Apex programming language and its features.
2. Visualforce framework and component development.
3. Lightning Component Framework and component development.
4. Integration and web services using Apex.
5. Best practices for programmatic development in Salesforce.

Exam Syllabus:

The exam syllabus for DEX-450 includes the following topics:

1. Apex Development
2. Visualforce Development
3. Lightning Component Development
4. Integration and Web Services

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SalesForce
DEX-450
Programmatic Development using Apex and Visualforce
in Lightning Experience
https://killexams.com/pass4sure/exam-detail/DEX-450
Question: 88
In a single record, a user selects multiple values from a multi-select picklist.
How are the selected values represented in Apex?
A. As a String with each value separated by a comma
B. As a Set with each value as an element in the set
C. As a String with each value separated by a semicolon
D. As a List with each value as an element in the list Previous
Answer: C
Question: 89
What is a benefit of using an after insert trigger over using a before insert trigger?
A. An after insert trigger allows a developer to bypass validation rules when updating fields on the new record.
B. An after insert trigger allows a developer to insert other objects that reference the new record.
C. An after insert trigger allows a developer to make a callout to an external service.
D. An after insert trigger allows a developer to modify fields in the new record without a query.
Answer: B
Question: 90
Why would a developer consider using a custom controller over a controller extension?
A. To increase the SOQL query governor limits.
B. To implement all of the logic for a page and bypass default Salesforce functionality
C. To leverage built-in functionality of a standard controller
D. To enforce user sharing settings and permissions
Answer: B
Question: 91
Using the Schema Builder, a developer tries to change the API name of a field that is referenced in an Apex test class.
What is the end result?
A. The API name is not changed and there are no other impacts.
B. The API name of the field and the reference in the test class is changed.
C. The API name of the field is changed, and a warning is issued to update the class.
D. The API name of the field and the reference in the test class is updated.
Answer: C
Question: 92
Which set of roll-up types are available when creating a roll-up summary field?
A. COUNT, SUM, MIN, MAX
B. AVERAGE, SUM, MIN, MAX
C. SUM, MIN, MAX
D. AVRAGE, COUNT, SUM, MIN, MAX
Answer: A
Question: 93
Which two number expressions evaluate correctly? (Choose two.)
A. Double d = 3.14159;
B. Integer I = 3.14159;
C. Decimal d = 3.14159;
D. Long l = 3.14159;
Answer: A,C
Question: 94
How should a developer prevent a recursive trigger?
A. Use a �one trigger per object� pattern.
B. Use a static Boolean variable.
C. Use a trigger handler.
D. Use a private Boolean variable.
Answer: D
Question: 95
A developer needs to create a Visualforce page that displays Case data. The page will be used by both support reps
and support managers. The Support Rep profile does not allow visibility of the Customer_Satisfaction__c field, but the
Support Manager profile does.
How can the developer create the page to enforce Field Level Security and keep future maintenance to a minimum?
A. Create one Visualforce Page for use by both profiles.
B. Use a new Support Manager permission set.
C. Create a separate Visualforce Page for each profile.
D. Use a custom controller that has the with sharing keywords.
Answer: D
Question: 96
How can a developer determine, from the DescribeSObjectResult, if the current user will be able to create records for
an object in Apex?
A. By using the isInsertable() method.
B. By using the isCreatable() method.
C. By using the hasAccess() method.
D. By using the canCreate() method.
Answer: B
Question: 97
A newly hired developer discovers that there are multiple triggers on the case object.
What should the developer consider when working with triggers?
A. Developers must dictate the order of trigger execution.
B. Trigger execution order is based on creation date and time.
C. Unit tests must specify the trigger being tested.
D. Trigger execution order is not guaranteed for the same sObject.
Answer: D
Question: 98
Which two statements are true about using the @testSetup annotation in an Apex test class? (Choose two.)
A. The @testSetup annotation cannot be used when the @isTest(SeeAllData=True) annotation is used.
B. Test data is inserted once for all test methods in a class.
C. Records created in the @testSetup method cannot be updates in individual test methods.
D. The @testSetup method is automatically executed before each test method in the test class is executed.
Answer: D
Question: 99
A developer has the following query: Contact c = [SELECT id, firstname, lastname, email FROM Contact WHERE
lastname = �Smith�];
What does the query return if there is no Contact with the last name �Smith�?
A. A contact initialized to null.
B. An error that no rows are found.
C. An empty List of Contacts.
D. A Contact with empty values.
Answer: B
Question: 100
Which SOQL query successfully returns the Accounts grouped by name?
A. SELECT Type, Max(CreatedDate) FROM Account GROUP BY Name
B. SELECT Name, Max(CreatedDate) FROM Account GROUP BY Name
C. SELECT Id, Type, Max(CreatedDate) FROM Account GROUP BY Name
D. SELECT Type, Name, Max(CreatedDate) FROM Account GROUP BY Name LIMIT 5
Answer: B
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Programmatic Development using Apex and Visualforce in Lightning Experience Practice Test

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