Start your DEX-450 Exam Questions Preparation with Updated 202 Questions [Q104-Q122]

Start your DEX-450 Exam Questions Preparation with Updated 202 Questions

A Fully Updated 2025 DEX-450 Exam Dumps - PDF Questions and Testing Engine

Salesforce DEX-450 certification exam is designed for Salesforce developers who want to demonstrate their expertise in programmatic development using Apex and Visualforce in Lightning Experience. Programmatic Development using Apex and Visualforce in Lightning Experience certification exam is intended for individuals who have experience developing for the Salesforce platform and are looking to expand their knowledge and skills in programmatic development.

NEW QUESTION # 104
A developer needs to prevent the creation of Request__c records when certain coVraitions exist in the system. A RequeatLogic class exists that checks the conditions.
What is the correct implementation?

Answer: B

NEW QUESTION # 105
A developer has the following requirements:
Calculate the total amount on an Order.
Calculate the line amount for each Line Item based on quantity selected and price.
Move Line Items to a different Order if a Line Item is not stock.
Which relationship implementation supports these requirements?

A. Order has a Lookup field to Line Item and there can be many Line Items per Order.
B. Line Items has a Master-Detail field to Order and the Master can be re-parented.
C. Line Item has a Lookup field to Order and there can be many Line Items per Order
D. Order has a Master-Detail field to Line Item and there can be many Line Items per Order.

Answer: B

NEW QUESTION # 106
Universal Containers wants to automatically assign new cases to the appropriate support representative based on the case origin. They have created a custom field on the Case object to store the support representative name.
What is the best solution to assign the case to the appropriate support representative?

A. Use a formula field on the Case object.
B. Use a trigger on the Case object.
C. Use an Assignment Flow element.
D. Use a validation rule on the Case object.

Answer: C

Explanation:
Option B: Use an Assignment Flow element.
Correct Answer.
Using a record-triggered flow, you can automatically assign new cases based on the case origin.
Flows provide flexibility to set field values, assign records, and automate complex logic without code.
While an Apex trigger can perform the assignment, using declarative tools like Flow is recommended for maintainability and ease of use.
Validation rules enforce data integrity by preventing invalid data from being saved.
They do not assign records or automate processes.
Option D: Use a formula field on the Case object.
Incorrect.
Formula fields are read-only and cannot change record ownership or assign records.
They calculate values dynamically based on other fields.
Conclusion:
The best solution is to use an Assignment Flow element, which is Option B.
Reference:
Record-Triggered Flows
Automatically Assign Cases
Option C: Use a trigger on the Case object.
Possible but Not Best Practice.
Apex Triggers
Option A: Use a validation rule on the Case object.
Incorrect.

NEW QUESTION # 107
What is an accurate constructor for a custom controller named "MyController"?

A. public MyController (ApexPages.StandardController stdController) { account = (Account) stdController.getRecord(); }
B. public MyController (sObject obj) { account = (Account) obj; }
C. public MyController (List objects) { accounts = (List ) objects; }
D. public MyController () { account = new Account () ; }

Answer: D

NEW QUESTION # 108
Universal Container wants Opportunities to no longer be editable when reaching the Clousd stage.
How should a develoiper accomplish this?

A. Use a validation rule.
B. Mark fields as read-only on the page layout.
C. Use flow Builder
D. Use the Process Automation setting.

Answer: A

NEW QUESTION # 109
A developer must provide a custom user interface when users edit a Contact. Users must be able to use the interface in Salesforce Classic and Lightning Experience.
What should the developer do to provide the custom user interface?

A. Override the Contact's Edit button with a Visualforce page in Salesforce Classic and a Lightning page inLightning Experience.
B. Override the Contact's Edit button with a Visualforce page in Salesforce Classic and a Lightning component in Lightning Experience.
C. Override the Contact's Edit button with a Lightning page in Salesforce Classic and a Visualforce page in Lightning Experience.
D. Override the Contact's Edit button with a Lightning component in Salesforce Classic and a Lightning component in Lightning Experience.

Answer: B

NEW QUESTION # 110
What does the Lightning Component framework provide to developers?

A. Prebuilt components that can be reused
B. Extended governor limits for applications
C. Support for Classic and Lightning UIs
D. Templates to create custom components

Answer: A

NEW QUESTION # 111
While writing a test class that covers an OpportunityLineItem trigger, a Developer is unable to create a standard PriceBook since one already exists in the org.
How should the Developer overcome this problem?

A. Use @IsTest(SeeAllData=true) and delete the existing standard PriceBook.
B. Use Test.getStandardPricebookId() to get the standard PriceBook ID.
C. Use Test.loadData() and a Static Resource to load a standard Pricebook.
D. Use @TestVisible to allow the test method to see the standard PriceBook.

Answer: B

NEW QUESTION # 112
Which Lightning code segment should be written to declare dependencies on a Lightning component, c:accountList, that is used in a Visualforce page?
A)

B)

C)

D)

A. Option C
B. Option D
C. Option B
D. Option A

Answer: D

NEW QUESTION # 113
A developer is tasked to perform a security review of the ContactSearch Apex class that exists in the system. Whithin the class, the developer identifies the following method as a security threat: List<Contact> performSearch(String lastName){ return Database.query('Select Id, FirstName, LastName FROM Contact WHERE LastName Like %'+lastName+'%); } What are two ways the developer can update the method to prevent a SOQL injection attack? Choose 2 answers

A. Use a regular expression expression on the parameter to remove special characters.
B. Use the escapeSingleQuote method to sanitize the parameter before its use. (Missed)
C. Use the @Readonly annotation and the with sharing keyword on the class.
D. Use variable binding and replace the dynamic query with a static SOQL. (Missed)

Answer: A,C

NEW QUESTION # 114
A developer must perform a complex SOQL query that joins two objects in a Lightning component.
How can the Lightning component execute the query?

A. Use the Salesforce Streaming APL to perform the SOQL query.
B. Create a flow to execute the query end invoke from the Lightning component.
C. Invoke an Apex class with the method annotated as @AuraEnabled to perform the query.
D. Write the query in a custom Lightning web component wrapper and invoke from the Lightning component.

Answer: D

NEW QUESTION # 115
What is a capability of formula fields? (Choose 3)

A. Return and display a field value from another object using the VLOOKUP function.
B. Display the previous values for a field using the PRIORVALUE function.
C. Generate a link using the HYPERLINK function to a specific record in a legacy system.
D. Determine if a datetime field has passed using the NOW function.
E. Determine which of three different images to display using the IF function.

Answer: C,D,E

NEW QUESTION # 116
Which two statements are true about Getter and Setter methods as they relate to Visualforce?

A. A corresponding Setter method is required for each Getter method.
B. There is no guarantee for the order in which Getter methods are called.
C. Getter methods pass values from a controller to a page.
D. Setter methods always have to be declared global.

Answer: A,C

NEW QUESTION # 117
A developer wants to improve runtime performance of Apex calls by caching results on the client.
What is the most efficient way to implement this and follow best practices?

A. Call the setStorable () method on the action in the JavaScript client-side code.
B. Set a cookie in the browser for use upon return to the page.
C. Decorate the server-side method with @AuraEnsbled(storable=true).
D. Decorate the server-side method with @AuraZnabled(cacheable=true).

Answer: D

Explanation:
To improve runtime performance by caching Apex call results on the client, the developer should decorate the server-side method with @AuraEnabled(cacheable=true).
@AuraEnabled(cacheable=true) Annotation:
When applied to an Apex method, it enables the method's results to be cached on the client, improving performance for subsequent calls.
This is especially effective in Lightning Web Components (LWC) and can also be used in Aura components.
"To cache method results, annotate the method with @AuraEnabled(cacheable=true). Methods annotated with cacheable=true are called cached methods."
- Lightning Web Components Developer Guide: Call Apex Methods
Why Not Other Options:
A . Call the setStorable() method on the action in the JavaScript client-side code: This approach is used in Aura components but is less efficient and not considered best practice compared to using cacheable=true.
"For improved performance, use @AuraEnabled(cacheable=true) instead of action.setStorable()."
- Aura Components Developer Guide: Calling Server-Side Actions
B . Set a cookie in the browser for use upon return to the page: Managing cookies for caching Apex results is not efficient and can lead to security and scalability issues.
C . Decorate the server-side method with @AuraEnabled(storable=true): There is no storable=true parameter for @AuraEnabled. The correct parameter is cacheable=true.
Best Practices:
Use @AuraEnabled(cacheable=true): This is the recommended way to cache Apex method results in Lightning components.
"Apex methods annotated with @AuraEnabled(cacheable=true) are cached on the client and shared across components."
- Lightning Web Components Developer Guide: Apex Methods Cache
Conclusion: By decorating the Apex method with @AuraEnabled(cacheable=true), the developer enables client-side caching of the method's results, improving runtime performance in an efficient and recommended way.

NEW QUESTION # 118
An Apex method, getAccounts, that returns a list of Accounts given a searchTerm, is available for Lightning Web Components to use.
What is the correct definition of a Lightning Web Component property that uses the getAccounts method?

Answer: A

NEW QUESTION # 119
Universal Containers wants to automatically assign new cases to the appropriate support representative based on the case origin. They have created a custom field on the Case object to store the support representative name.
What is the best solution to assign the case to the appropriate support representative?

A. Use an Assignment Flow element.
B. Use a formula field on the case object.
C. Use a trigger an the Case object.
D. Use a validation rule on the Case object.

Answer: C

NEW QUESTION # 120
A developer must modify the following code snippet to prevent the number of SOQL queries issued from exceeding the platform governor limit. public class without sharing OpportunityService( public static List<OpportunityLineItem> getOpportunityProducts(Set<Id> opportunityIds){ List<OpportunitylineItem> oppLineItems = new List<OpportunityLineItem>(); for(Id thisOppId : opportunityIds){ oppLineItems.addAll([Select Id FROM OpportunityLineItems WHERE OpportunityId = :thisOppId)]; } return oppLineItems; } } The above method might be called during a trigger execution via a Lightning component. Which technique should be implemented to avoid reaching the governor limit?

A. Use the System.Limits.getQueries() method to ensure the number of queries is less than 100.
B. Use the System.Limits.getlimitQueries() method to ensure the number of queries is less than 100.
C. Refactor the code above to perform only one SOQL query, filtering by the Set of opportunityIds.
D. Refector the code above to perform the SOQL query only if the Set of opportunityIds contains less 100 Ids.

Answer: C

NEW QUESTION # 121
Consider the following code snippet for a Visualforce page that is launched using a Custom Button on the Account detail page layout.

When the Save button is pressed the developer must perform a complex validation that involves multiple objects and, upon success, redirect the user to another Visualforce page.
What can the developer use to meet this business requirement?