Programmatic Development using Apex and Visualforce in Lightning Experience DEX-450 Exam Questions

Regina2021-10-26T01:44:24+00:00

DEX-450 Programmatic Development using Apex and Visualforce in Lightning Experience is for programmatic developers looking to write programmatic customizations to both business logic and UI layers using Apex and Visualforce, passing DEX-450 exam to be a certified can prove that you can customize your Salesforce applications using code and explore how Apex interacts with declarative customizations on the platform. ITExamShop Salesforce DEX-450 certified experts have designed the DEX-450 exam questions with the precise answers in the way they ensure to Programmatic Development using Apex and Visualforce in Lightning Experience certification exam.

Reading Salesforce Certification DEX-450 Free Questions Below

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1. How should a developer create a new custom exception class?

public class CustomException extends Exception{}

CustomException ex = new (CustomException)Exception();

public class CustomException implements Exception{}

(Exception)CustomException ex = new Exception();

2. What is a capability of the Developer Console?

Execute Anonymous Apex code, Create/Edit code, view Debug Logs.

Execute Anonymous Apex code, Run REST API, create/Edit code.

Execute Anonymous Apex code, Create/Edit code, Deploy code changes.

Execute Anonymous Apex code, Run REST API, deploy code changes.

3. A reviewer is required to enter a reason in the comments field only when a candidate is recommended to be hired.

Which action can a developer take to enforce this requirement?

Create a required Visualforce component.

Create a formula field.

Create a required comments field.

Create a validation rule.

4. Why would a developer consider using a custom controller over a controller extension?

To increase the SOQL query governor limits.

To implement all of the logic for a page and bypass default Salesforce functionality

To leverage built-in functionality of a standard controller

To enforce user sharing settings and permissions

5. A developer wants to override a button using Visualforce on an object.

What is the requirement?

The controller or extension must have a PageReference method.

The standardController attribute must be set to the object.

The action attribute must be set to a controller method.

The object record must be instantiated in a controller or extension.

6. 1.Which statement results in an Apex compiler error?

Map<Id,Leas> lmap = new Map<Id,Lead>([Select ID from Lead Limit 8]);

Date d1 = Date.Today(), d2 = Date.ValueOf(‘2018-01-01’);

Integer a=5, b=6, c, d = 7;

List<string> s = List<string>{‘a’,‘b’,‘c’);

7. Which trigger event allows a developer to update fields in the Trigger.new list without using an additional DML statement?Choose 2 answers

Before insert

Before update

After update

After insert

8. What are two valid options for iterating through each Account in the collection List<Account> named AccountList? (Choose two.)

for (Account theAccount : AccountList) {…}

for(AccountList) {…}

for (List L : AccountList) {…}

for (Integer i=0; i < AccountList.Size(); i++) {…}

9. For which three items can a trace flag be configured? (Choose three.)

Apex Trigger

Apex Class

Process Builder

User

Visualforce

10. A Visualforce page has a standard controller for an object that has a lookup relationship to a parent object.

How can a developer display data from the parent record on the page?

By adding a second standard controller to the page for the parent record.

By using a roll-up formula field on the child record to include data from the parent record.

By using SOQL on the Visualforce page to query for data from the parent record.

By using merge field syntax to retrieve data from the parent record.

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11. What is the proper process for an Apex Unit Test

Query for test data using SeeAllData = true. Call the method being tested. Verify that the results are correct.

Query for test data using SeeAllData = true. Execute runAllTests(). Verify that the results are correct.

Create data for testing. Execute runAllTests(). Verify that the results are correct.

Create data for testing. Call the method being tested. Verify that the results are correct.

12. A Visualforce page is required for displaying and editing Case records that includes both standard and custom functionality defined in an Apex class called myControllerExtension.

The Visualforce page should include which <apex:page> attribute(s) to correctly implement controller functionality?

controller=“Case” and extensions=“myControllerExtension”

extensions=“myControllerExtension”

controller=“myControllerExtension”

standardController=“Case” and extensions=“myControllerExtension”

13. Which three options allow a developer to use custom styling in a Visualforce page? (Choose three.)

<apex:stylesheet> tag

Inline CSS

<apex:style>tag

<apex:stylesheets>tag

A static resource

14. How should a developer avoid hitting the governor limits in test methods?

Use @TestVisible on methods that create records.

Use Test.loadData() to load data from a static resource.

Use @IsTest (SeeAllData=true) to use existing data.

Use Test.startTest() to reset governor limits.

15. When loading data into an operation, what can a developer do to match records to update existing records? (Choose 2)

Match an auto-generated Number field to a column in the imported file.

Match an external Id Text field to a column in the imported file.

Match the Name field to a column in the imported file.

Match the Id field to a column in the imported file.

16. A developer needs to provide a Visualforce page that lets users enter Product-specific details during a Sales cycle.

How can this be accomplished? (Choose 2)

Download a Managed Package from the AppExhange that provides a custom Visualforce page to modify.

Copy the standard page and then make a new Visualforce page for Product data entry.

Download an Unmanaged Package from the AppExchange that provides a custom Visualforce page to modify.

Create a new Visualforce page and an Apex controller to provide Product data entry.

17. What are three characteristics of static methods? (Choose three.)

Initialized only when a class is loaded

A static variable outside of the scope of an Apex transaction

Allowed only in outer classes

Allowed only in inner classes

Excluded from the view state for a Visualforce page

18. A lead object has a custom field Prior_Email__c.

The following trigger is intended to copy the current Email into the Prior_Email__c field any time the Email field is changed:

Which type of exception will this trigger cause?

A null reference exception

A compile time exception

A DML exception

A limit exception when doing a bulk update

19. Which set of roll-up types are available when creating a roll-up summary field?

COUNT, SUM, MIN, MAX

AVERAGE, SUM, MIN, MAX

SUM, MIN, MAX

AVRAGE, COUNT, SUM, MIN, MAX

20. A Platform Developer needs to write an Apex method that will only perform an action if a record is assigned to a specific Record Type.

Which two options allow the developer to dynamically determine the ID of the required Record Type by its name? (Choose two.)

Make an outbound web services call to the SOAP AP

Hardcode the ID as a constant in an Apex class.

Use the getRecordTypeInfosByName() method in the DescribeSObjectResult class.

Execute a SOQL query on the RecordType object.

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21. A developer is asked to set a picklist field to ‘Monitor’ on any new Leads owned by a subnet of Users.

How should the developer implement this request?

Create an after insert Lead trigger.

Create a before insert Lead trigger.

Create a Lead Workflow Rule Field Update.

Create a Lead formula field.

22. A platform developer at Universal Containers needs to create a custom button for the Account object that, when clicked, will perform a series of calculations and redirect the user to a custom Visualforce page.

Which three attributes need to be defined with values in the <apex:page> tag to accomplish this? (Choose three.)

action

renderAs

standardController

readOnly

extensions

23. A developer needs to test an Invoicing system integration. After reviewing the number of transactions required for the test, the developer estimates that the test data will total about 2 GB of data storage. Production data is not required for the integration testing.

Which two environments meet the requirements for testing? (Choose two.)

Developer Sandbox

Full Sandbox

Developer Edition

Partial Sandbox

Developer Pro Sandbox

24. A developer needs to create a Visualforce page that will override the standard Account edit button. The page will be used to validate the account's address using a SOQL query. The page will also allow the user to make edits to the address.

Where would the developer write the Account address verification logic?

In a Standard Extension.

In a Standard Controller.

In a Custom Controller.

In a Controller Extension.

25. Which statement about change set deployments is accurate? (Choose 3)

They use an all or none deployment model.

They require a deployment connection.

They ca be used to transfer Contact records.

They can be used to deploy custom settings data.

They can be used only between related organizations.

26. What is a capability of the <ltng:require> tag that is used for loading external Javascript libraries in Lightning Component? (Choose three.)

Loading files from Documents.

One-time loading for duplicate scripts.

Specifying loading order.

Loading scripts in parallel.

Loading externally hosted scripts.

27. Which approach should a developer take to automatically add a “Maintenance Plan” to each Opportunity that includes an “Annual Subscription” when an opportunity is closed?

Build a OpportunityLineItem trigger that adds a PriceBookEntry record.

Build an OpportunityLineItem trigger to add an OpportunityLineItem record.

Build an Opportunity trigger that adds a PriceBookEntry record.

Build an Opportunity trigger that adds an OpportunityLineItem record.

28. Which two statements are true about using the @testSetup annotation in an Apex test class? (Choose two.)

The @testSetup annotation cannot be used when the @isTest(SeeAllData=True) annotation is used.

Test data is inserted once for all test methods in a class.

Records created in the @testSetup method cannot be updates in individual test methods.

The @testSetup method is automatically executed before each test method in the test class is executed.

29. What are two benefits of the Lightning Component framework? (Choose two.)

It simplifies complexity when building pages, but not applications.

It provides an event-driven architecture for better decoupling between components.

It promotes faster development using out-of-box components that are suitable for desktop and mobile devices.

It allows faster PDF generation with Lightning components.

30. How should a developer prevent a recursive trigger?

Use a “one trigger per object” pattern.

Use a static Boolean variable.

Use a trigger handler.

Use a private Boolean variable.

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31. In which order does Salesforce execute events upon saving a record?

Before Triggers; Validation Rules; After Triggers; Assignment Rules; Workflow Rules; Commit

Validation Rules; Before Triggers; After Triggers; Workflow Rules; Assignment Rules; Commit

Before Triggers; Validation Rules; After Triggers; Workflow Rules; Assignment Rules; Commit

Validation Rules; Before Triggers; After Triggers; Assignment Rules; Workflow Rules; Commit

32. Which two Apex data types can be used to reference a Salesforce record ID dynamically? (Choose two.)

ENUM

sObject

External ID

String

33. A developer writes a SOQL query to find child records for a specific parent.

How many levels can be returned in a single query?

34. A developer needs to join data received from an integration with an external system with parent records in Salesforce. The data set does not contain the Salesforce IDs of the parent records, but it does have a foreign key attribute that can be used to identify the parent.

Which action will allow the developer to relate records in the data model without knowing the Salesforce ID?

Create and populate a custom field on the parent object marked as Unique.

Create a custom field on the child object of type External Relationship.

Create and populate a custom field on the parent object marked as an External I

Create a custom field on the child object of type Foreign Key.

35. Where would a developer build a managed package?

Developer Sandbox

Unlimited Edition

Partial Copy Sandbox

Developer Edition

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Programmatic Development using Apex and Visualforce in Lightning Experience DEX-450 Exam Questions

Reading Salesforce Certification DEX-450 Free Questions Below

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