[Full-Version] 2025 New Exam4Docs DEX-450 PDF Recently Updated Questions
DEX-450 Exam with Guarantee Updated 202 Questions
NEW QUESTION # 64
Get Cloudy Consulting (GCC) has a multitude of servers that host its customers' websites. GCC wants to provide a servers status page that is always on display in its call center. It should update in real time with any changes made to any servers. To accommodate this on the server side, a developer created a server Update platform event.
The developer is working on a Lightning web component to display the information.
- A. import ( subscribe, unsubscribe, onError ) from 'lightning/pubsub'
- B. import ( subscribe, unsubscribe, onError ) from 'lightning/MessageChannel'
- C. import ( subscribe, unsubscribe, onError ) from 'lightning/ServerUpdate'
- D. import ( subscribe, unsubscribe, onError ) from 'lightning/empApi '
Answer: D
NEW QUESTION # 65
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.
Answer: C
NEW QUESTION # 66
A developer needs to create records for the object Property__c. The developer creates the following code block:List propertiesToCreate = helperClass.createProperties();try { // line 3 } catch (Exception exp ) { //exception handling }Which line of code would the developer insert at line 3 to ensure that at least some records are created, even if a few records have errors and fail to be created?
- A. insert propertiesToCreate;
- B. Database.insert(propertiesToCreate, false);
- C. Database.insert(propertiesToCreate, System.ALLOW_PARTIAL);
- D. Database.insert(propertiesToCreate);
Answer: B
NEW QUESTION # 67
What are two use cases for executing Anonymous Apex code? Choose 2 answers
- A. To delete 15,000 inactive Accounts In a single transaction after a deployment
- B. To schedule an Apex class to run periodically
- C. To add unit test code coverage to an org
- D. To run a batch Apex class to update all Contacts
Answer: B,D
NEW QUESTION # 68
Universal Containers wants a list button to display a Visualforce page that allows users to edit multiple records.
Which Visualforce feature supports this requirement?
- A. Controller Extension and <spex:listButton> tag
- B. Standard Controller with Custom List Controller extension
- C. Custom List Controller with recorasetvar page attribute
- D. Standard controller and the recordsetvar page attribute
Answer: D
NEW QUESTION # 69
What should a developer use to fix a Lightning web component bug in a sandbox?
- A. VS Code
- B. Force.com IDE
- C. Developer Console
- D. Execute Anonymous
Answer: A
NEW QUESTION # 70
A developer writes a SOQL query to find child records for a specific parent. How many levels can be returned in a single query?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION # 71
n org has an existing flow that creates an Opportunity with an Update Records element. A developer must update the flow to aiso create a 'Contact and store the created Contact's 1D on the Opportunity.
Which update must the developer make in the flow?
- A. Add a new Get Records element.
- B. Add a new Update Records element.
- C. Add a new Roll back Records element
- D. Add a new Create Records element.
Answer: D
NEW QUESTION # 72
Assuming that name is a String obtained by an <apex:inpucText> tag on a Visualforce page, which two SOQL queries performed are safe from SOQL injection? Choose 2 answers
- A.
- B.
- C.
- D.
Answer: B,D
Explanation:
Option A:
String query = 'SELECT Id FROM Account WHERE Name LIKE \'%' + String.escapeSingleQuotes(name) + '%\''; List<Account> results = Database.query(query); Reference:
Why Safe: By escaping single quotes, it mitigates the risk of SOQL injection attacks that rely on manipulating string literals.
Option C:
String query = '%' + name + '%';
List<Account> results = [SELECT Id FROM Account WHERE Name LIKE :name]; Why Safe: Bind variables are the recommended way to include user input in SOQL queries safely, as they prevent injection by treating the input as a parameter rather than part of the query string.
Option B:
String query = 'SELECT Id FROM Account WHERE Name LIKE \'%' + name.noQuotes() + '%\''; List<Account> results = Database.query(query); Why Unsafe: Without proper sanitization, the name variable could contain malicious SOQL code, leading to injection vulnerabilities.
Option D:
String query = 'SELECT Id FROM Account WHERE Name LIKE \'%' + name + '%\''; List<Account> results = Database.query(query); Why Unsafe: Direct concatenation of user input without sanitization leaves the application vulnerable to SOQL injection attacks.
Conclusion:
Safe Options: A and C are safe from SOQL injection because they properly handle user input through escaping and bind variables, respectively.
Unsafe Options: B and D are unsafe as they do not adequately prevent SOQL injection.
NEW QUESTION # 73
What are the eight officially supported languages on Heroku platform?
- A. Node,Ruby java,PHP,Python,Go,Scala,Clojure.
- B. Lisp,PHP,Node,Ruby,Scala,Haskell,Go,Erlang.
- C. Node,Ruby,java,PHP,Python,.Net,C++.
- D. C#,C++,Node,Ruby,Java,PHP,Go,.Net.
Answer: A
NEW QUESTION # 74
A developer must create a CreditcardPayment class that provides an implementation of an existing Payment class. Public virtual class Payment { public virtual void makePayment(Decimal amount) { /*implementation*/ } } Which is the correct implementation?
- A. Public class CreditcardPayment extends Payment {
public override void makePayment(Decimal amount) { /*implementation*/ }
} - B. Public class CreditCardPayment implements Payment {
public override void makePayment(Decimal amount) { /*Implementation*/ }
} - C. Public class CreditCardPayment extends Payment {
public virtual void makePayment(Decimal amount) { /*implementation*/ }
} - D. Public class CreditCardPayment implements Payment {
public virtual void makePayment(Decimal amount) { /*implementation*/ }
}
Answer: A
NEW QUESTION # 75
To which data type in Apex a currency field automatically assigned?
- A. Double
- B. Integer
- C. Decimal
- D. Currency
Answer: C
NEW QUESTION # 76
A developer migrated functionality from JavaScript Remoting to a Lightning web component and wants to use the existing getOpportunities() method to provide data.
What to do now?
- A. The method must return a String of a serialized JSON Array.
- B. The method must be decorated with @AuraEnabled.
- C. The method must return a JSON Object.
- D. The method must be decorated with (cacheable=true).
Answer: D
NEW QUESTION # 77
Which two statements are true about Getter and Setter methods as they relate to Visualforce?
- A. Setter methods always have to be declared global.
- B. Getter methods pass values from a controller to a page.
- C. A corresponding Setter method is required for each Getter method.
- D. There is no guarantee for the order in which Getter methods are called.
Answer: B,C
NEW QUESTION # 78
Which two statements can a developer use to throw a custom exception of type MissingFieldValueException? Choose 2 answers.
- A. Throw (MissingFieldValueException, 'Problem occurred');
- B. Throw new MissingFieldValueException();
- C. Throw Exception (new MissingFieldValueException());
- D. Throw new MissingFieldValueException ('Problem occurred');
Answer: B,D
NEW QUESTION # 79
A developer writes a trigger on the Account object on the before update event that increments a count field. A workflow rule also increments the count field every time that an Account is created or update. The field update in the workflow rule is configured to not re-evaluate workflow rules. What is the value of the count field if an Account is inserted with an initial value of zero, assuming no other automation logic is implemented on the Account?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION # 80
Universal Hiring is using Salesforce to capture job applications. A salesforce administrator created two custom objects; Job c acting as the master object, Job application.__: acting as the detail.
What is the recommended tool a developer should use to meet the business requirement?
- A. Record-triggered flow
- B. Process Builder
- C. Formula field
- D. Apex trigger
Answer: C
NEW QUESTION # 81
Universal Containers decides to use exclusively declarative development to build out a new Salesforce application. Which three options should be used to build out the database layer for the application? Choose 3 answers
- A. Process Builder
- B. Triggers
- C. Custom Objects and Fields
- D. Relationships
- E. Roll-Up Summaries
Answer: A,D,E
NEW QUESTION # 82
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 try/catch block to the Apex class.
- C. Include a savepoint and Database.rollback().
- 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 # 83
Which three Salesforce resources can be accessed from a Lightning web component?
Choose 3 answers
- A. Content asset files
- B. Static resources
- C. All external libraries
- D. SVG resources
- E. Third-party web components
Answer: B,C,D
NEW QUESTION # 84
How can a developer use a Set<Id> to limit the number of records returned by a SOQL query?
- A. Pass the query results as an argument in a reference to the Set.containsAll() method.
- B. Reference the Set in the LIMIT clause of the query
- C. Pass the Set as an argument in a reference to the Database.query() method
- D. Reference the Set in the WHERE clause of the query
Answer: D
NEW QUESTION # 85
What is a valid source and destination pair that can send or receive change sets? (Choose 2)
- A. Sandbox to Sandbox
- B. Developer Edition to Production
- C. Developer Edition to Sandbox
- D. Sandbox to Production
Answer: A,D
NEW QUESTION # 86
From which 2 locations can a developer determine the overall code coverage for a sandbox?
- A. The test suite run panel of the developer console
- B. The tests tab of the developer console
- C. The apex classes setup page
- D. The apex test execution page
Answer: B,C
NEW QUESTION # 87
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DEX-450 Updated Exam Dumps [2025] Practice Valid Exam Dumps Question: https://drive.google.com/open?id=1JaEhjEn0hrWdotpcXIxHKHz51RDeP_69
