Fast2test CRT-450問題集240問でSalesforce Developersを確実実践
リアル最新CRT-450試験問題CRT-450問題集
質問 # 99
A developer identifies the following triggers on the Expense__c object:
The triggers process before delete, before insert, and before update events respectively.
Which two techniques should the developer implement to ensure trigger best practices are followed?
Choose 2 answers
- A. Unify the before insert and before update triggers and use Flow for the delete action.
- B. Maintain all three triggers on the expense__c object, but move the Apex logic out of the trigger definition.
- C. Unify all three triggers in a single trigger on the expense__c object that includes all events.
- D. Create helper classes to execute the appropriate logic when a record is saved.
正解：B、D
質問 # 100
A developer writes the following code:
What is the result of the debug statement?
- A. 2, 200
- B. 2, 150
- C. 1, 100
- D. 1, 150
正解：B
質問 # 101
A developer is designing a new application on the Salesforce platform and wants to ensure it can support multiple tenants effectively.
Which design framework should the developer consider to ensure scalability and maintainability?
- A. Model-View-Controller (MVC)
- B. Agile Development
- C. Waterfall Model
- D. Flux (view, action, dispatcher, and store)
正解：A
解説：
MVC: The Model-View-Controller design pattern is ideal for Salesforce development as it separates the business logic (model), user interface (view), and controller logic, ensuring scalability and maintainability.
Salesforce's architecture inherently supports MVC, with sObjects as the model, Visualforce or Lightning components as the view, and Apex controllers as the controller.
Why not other options?
A: The Waterfall model is a development methodology, not a design framework.
B: Flux is a front-end application architecture and not relevant to Salesforce.
D: Agile is a development methodology, not a design framework.
Salesforce MVC Architecture
質問 # 102
A developer has a Visualforce page and custom controller to save Account records. The developer wants to display any validation rule violation to the user. How can the developer make sure that validation rule violations are displayed?
- A. Perform the DML using the Database.upsert() method.
- B. Use a try/catch with a custom exception class.
- C. Include <apex:message> on the Visualforce page.
- D. Add cuatom controller attributes to display the message.
正解：C
質問 # 103
Uniersal Containers (UC) is developing a process for their sales teams that requires all sales reps to go through a set of scripted steps with each new customer they create.
In the first steps of collecting information, UC's ERP system must be checked via as a REST endpoint to see if the customerexists. If the customer exists, the data must be presented to the sales rep in Salesforce.
Which two should a developer implement to satisfy the requirements?
Choose2 answer
- A. Future method
- B. Trigger
- C. Invocable method
- D. Flow
正解：C、D
解説：
To satisfy the requirements, a developer should implement a flow and an invocable method. A flow is a declarative tool that allows you to automate business processes by collecting data and performing actions in your org or an external system1. An invocable method is a method that can be called by a flow, a process, or another Apex method2. By using a flow and an invocable method, the developer can achieve the following steps:
* Create a flow that guides the sales rep through the scripted steps with each new customer they create1.
* In the flow, use an Apex action to invoke an invocable method that calls the REST endpoint of UC's ERP system and passes the customer information as a parameter23.
* In the invocable method, use the HttpRequest and HttpResponse classes to send a GET request to the REST endpoint and receive a response that contains the customer data4.
* In the invocable method, parse the response body and return the customer data as an output parameter to the flow24.
* In the flow, use a screen element to display the customer data to the sales rep if the customer exists in the ERP system1.
Using a future method or a trigger are not effective ways to satisfy the requirements. A future method is a method that runs in the background, asynchronously, after the current transaction finishes5. A trigger is a piece of Apex code that executes before or after a record is inserted, updated, deleted, or undeleted. Neither of these options can interact with the flow or the sales rep, and they are not suitable for calling a REST endpoint that requires a synchronous response5 . References: 1 Automate Your Business Processes with Flows | Salesforce Trailhead1, 2 InvocableMethod Annotation | Apex Developer Guide | Salesforce Developers2, 3 Call Apex Code from a Flow | Salesforce Trailhead3, 4 Apex REST Callouts | Apex Developer Guide | Salesforce Developers4, 5 Asynchronous Apex | Apex Developer Guide | Salesforce Developers5, Triggers | Apex Developer Guide | Salesforce Developers
質問 # 104
A developer has an integer variable called maxAttempts. The developer needs to ensure that once maxAttempts is initialized, it preserves its value for the length of the Apex transaction; while being able to share the variable's state between trigger executions.
How should the developer declare maxAttempts to meet these requirements?
- A. Declare maxattempts as a member variable on the trigger definition.
- B. Declare maxattempts as a constant using the static and final keywords.
- C. Declare maxattempts as a variable on a helper class.
- D. Declare maxAttempts as a private static variable on a helper class.
正解：D
解説：
To preserve the value ofmaxAttemptsfor the length of the Apex transaction and share its state between trigger executions:
Static Variable:
Static variables are initialized once per transaction and retain their value throughout the transaction.
They can be accessed without instantiating the class.
Private Scope:
Declaring it as private ensures encapsulation and prevents unintended external modification.
Helper Class:
Using a helper class ensures the separation of concerns, keeping trigger logic clean and adhering to best practices.
Example Code:public class HelperClass {
private static Integer maxAttempts = 5; // Default value
public static Integer getMaxAttempts() {
return maxAttempts;
}
public static void setMaxAttempts(Integer attempts) {
maxAttempts = attempts;
}
}
A:Constants (static + final) cannot be modified after initialization.
B:Trigger member variables cannot retain values across executions within the same transaction.
C:Declaring it as a non-static variable in a helper class would reset its value during each trigger execution.
Why Not the Other Options?
質問 # 105
In an organization that has enabled multiple currencies, a developer needs to aggregate the sum of the Estimated_value__c currency field from the CampaignMember object using a roll-up summary field called Total_estimated_value__c on Campaign.
- A. The values in Campaignmember.Estimated_value__c are converted into the currency of the Campaign record and the sum is displayed using the currency on the Campaign record.
- B. The values in CampaignMember.Estimated_value__c are converted into the currency on the majority of the CampaignMember records and the sum is displayed using that currency.
- C. The values In CampaignMember.Estimated_value__c are converted into the currency of the current user, and the sum is displayed using the currency on the Campaign record.
- D. The values in CampaignMember.Estimated_value__c are summed up and the resulting Total_estimated_value__c field is displayed as a numeric field on the Campaign record.
正解：A
質問 # 106
Which two practices should be used for processing records in a trigger? (Choose two.)
- A. Use @futuremethods to handle DML operations.
- B. Use a Mapto reduce the number of SOQL calls.
- C. Use a Setto ensure unique values in a query filter.
- D. Use (callout=true)to update an external system.
正解：B、C
解説：
Explanation/Reference:
質問 # 107
Which code should be used to update an existing Visualforce page that uses standard Visualforce components so that the page matches the look and feel of Lightning Experience?
- A. <apex:includeLightning/>
- B. <apex:page lightningStyleSheets="true">
- C. <apex:styleSheet value="({$URLFOR($Resource.slds,'assets/slds.css')}">
- D. <apex:slds/>
正解：B
質問 # 108
The sales management team at Universal Container requires that the Lead Source field of the Lead record be populated when a.. converted.
What should be done to ensure that a user populates the Lead Source field prior to converting a Lead?
- A. Use a formula field.
- B. Use a validation rule.
- C. Use Lead Conversation field mapping.
- D. Create an after trigger on Lead.
正解：B
解説：
The Lead Source field is a standard picklist field that indicates the source of the lead, such as web, phone inquiry, partner referral, and others1. The Lead Source field is related to the contact, account, and opportunity Source fields, and the value can be inherited from one field to the next as a lead progresses through the funnel2. To ensure that a user populates the Lead Source field prior to converting a lead, the best option is to use a validation rule. A validation rule is a formula that evaluates the data in one or more fields and returns a value of true or false3. Validation rules verify that the data a user enters in a record meets the standards you specify before the user can save the record3. By creating a validation rule on the Lead object that checks if the Lead Source field is blank, you can prevent the user from converting the lead without filling in the Lead Source field. You can also display a custom error message to inform the user of the requirement3. For example, the validation rule formula could be:
ISBLANK(LeadSource)
And the error message could be:
Please enter a value for Lead Source before converting the lead.
Using a formula field, Lead Conversion field mapping, or an after trigger on Lead are not effective ways to ensure that the user populates the Lead Source field prior to converting a lead. A formula field is a read-only field that derives its value from a formula expression you define. It cannot be edited by the user and cannot enforce data entry. Lead Conversion field mapping is a way to specify how fields in the lead record are transferred to the fields in the contact, account, and opportunity records during lead conversion. It cannot prevent the user from converting the lead without entering the Lead Source field. An after trigger on Lead is a piece of Apex code that executes after a lead record is inserted, updated, deleted, or undeleted. It cannot validate the data entered by the user before the lead conversion occurs. References: 1 Lead | Object Reference for the Salesforce Platform | Salesforce Developers1, 2 Let's Talk About Salesforce Lead Source | Salesforce Ben2, 3 Validation Rules | Salesforce Help3, Formula Field | Salesforce Field Reference Guide | Salesforce Developers, Map Lead Fields for Lead Conversion | Salesforce Help, Triggers | Apex Developer Guide | Salesforce Developers
質問 # 109
The Account object has a custom formula field,Level__c, that is defined as a Formula(Number) with two decimal places. Which three are valid assignments? Choose 3.
- A. Long myLevel = acct.Level__c;
- B. Integer myLevel = acct.Level__c;
- C. Object myLevel = acct.Level__c;
- D. Double myLevel = acct.Level__c;
- E. Decimal myLevel = acct.Level__c;
正解：C、D、E
質問 # 110
A developer needs to update an unrelated object when a record gets saved. Which two trigger types should the developer create?
- A. Before insert
- B. After update
- C. After insert
- D. Before update
正解：A、D
質問 # 111
The Review_c object has a lookup relationship up to the Job_Application_c object. The Job_Application_c object has a master-detail relationship up to the Position_c object. The relationship field names are based on the auto-populated defaults.
What is the recommended way to display field data from the related Position_c record on a Visualforce page for a single Review_c record?
- A. Use the Standard Controller for Review_c and expression syntax in the Page to display related Position_c data through the Job_Application_c object.
- B. Use the Standard Controller for Job_Application_c and a Controller Extension to query for Position_c data.
- C. Use the Standard Controller for Review_c and cross-object Formula Fields on the Position_c object to display Position_c data.
- D. Use the Standard Controller for Job_Application_c and cross-object Formula Fields on the Review_c object to display Position_c data.
正解：D
質問 # 112
In the following example, which starting context will mymethod execute it is invoked?
- A. Sharig rules will be inherited from the calling context.
- B. Sharig rules will not be enforced for the running user.
- C. Sharig rules will be enforced for the running user.
- D. Sharig rules will be enforced by the instartiating class.
正解：C
解説：
In Salesforce, the sharing rules are always enforced for the running user if not explicitly stated otherwise. The running user's permissions and field-level security are always enforced, regardless of whether the class is defined with or without sharing. So in this case, since there is no explicit sharing declaration in the provided code snippet, it defaults to enforcing the sharing rules for the running user. References:
* Apex Developer Guide: Using the with sharing, without sharing, and inherited sharing Keywords
* Trailhead: Apex Sharing and Security
質問 # 113
Developers at Universal Containers (UC) use version control to share their code changes, but they notice that when they deploy their code to different environments they often have failures. They decide to set up Continuous Integration (CI).
What should the UC development team use to automatically run tests as part of their CI process?
- A. Salesforce CLI
- B. Visual Studio Code
- C. Developer Console
- D. Force.com Toolkit
正解：A
解説：
Salesforce CLI is a command-line interface that lets you run commands to create, test, and deploy Salesforce applications. You can easily integrate Salesforce CLI commands into various CI tools, such as CircleCI, Jenkins, or Travis CI, to automate testing and deployment of Salesforce applications against scratch orgs.
Salesforce CLI also supports the Salesforce DX development model, which enables source-driven development, team collaboration, and agile delivery. References:
* Continuous Integration | Salesforce DX Developer Guide
* Set Up Continuous Integration for Your Salesforce Projects | Salesforce Developers Blog
* Collaborate Using Continuous Integration Unit | Salesforce Trailhead
質問 # 114
A developer needs to provide a way to mass edit, update, and delete records from a list view.
In which two ways can this be accomplished? (Choose two.)
- A. Download an unmanaged package from the AppExchange that provides customizable mass edit, update, and delete functionality.
- B. Download a managed package from the AppExchange that provides customizable Enhanced List Views and buttons.
- C. Create a new Visualforce page and Apex Controller for the list view that provides mass edit, update, and delete functionality.
- D. Configure the user interface and enable both inline editing and enhanced lists.
正解：B、C
質問 # 115
What writing an Apex class, a developer warts to make sure thai 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 tospecification?
- A. Run the code in an Execute Anonymous block n the Deceloper Consider.
- B. Create a test class to execute the business logic and run the test in the Developer Console.
- C. Include a savepoint and Database,rollback.
- D. Include a try/catch block to the Apex class.
正解：B
解説：
Creating a test class to execute the business logic and run the test in the Developer Console is the best approach to ensure that the Apex class is working according to specification. Test classes are used to verify the functionality, performance, and security of the Apex code, and to provide code coverage for deployment. Test classes can also use assertions to validate the expected outcomes of the code. The Developer Console provides a user interface to create, run, and debug test classes, and to view the test results and code coverage1.
Including a savepoint and Database.rollback is not a valid approach to test the Apex class, as it is used to undo the changes made by the DML operations in a transaction2. This does not verify the functionality or performance of the Apex code, nor does it provide code coverage.
Including a try/catch block to the Apex class is not a sufficient approach to test the Apex class, as it is used to handle the exceptions that may occur during the execution of the code3. This does not verify the functionality or performance of the Apex code, nor does it provide code coverage. Moreover, a try/catch block should be used in conjunction with a test class, not as a replacement.
Running the code in an Execute Anonymous block in the Developer Console is not a recommended approach to test the Apex class, as it is used to execute arbitrary Apex code that is not saved as part of the application.
This does not verify the functionality or performance of the Apex code, nor does it provide code coverage.
Moreover, running the code in an Execute Anonymous block may have unintended consequences on the data and the application, as it does not follow the best practices of testing.
References:
* 1: Test Classes | Apex Developer Guide | Salesforce Developers
* 2: Savepoints and Rollbacks | Apex Developer Guide | Salesforce Developers
* 3: Exception Handling | Apex Developer Guide | Salesforce Developers
* : [Execute Anonymous | Apex Developer Guide | Salesforce Developers]
* : [Best Practices for Testing | Apex Developer Guide | Salesforce Developers]
質問 # 116
When a Task is created for a Contact, how can a developer prevent the task from being included on the Activity Timeline of the Contact's Account record?
- A. Use Process Builder to create a process to set the Task Account field to blank.
- B. By default, tasks do not display on the Account Activity Timeline.
- C. In Activity Setting, uncheck Roll up activities to a contact's primary account.
- D. Create a Task trigger to set the Account field to NULL.
正解：C
質問 # 117
How does the Lightning Component framework help developers implement solutions faster?
- A. By providing code review standards and processes
- B. By providing device-awareness for mobile and desktops
- C. By providing change history and version control
- D. By providing an Agile process with default steps
正解：B
解説：
The Lightning Component Framework simplifies development by providing built-in device awareness, enabling components to adapt automatically for different devices such as mobile phones, tablets, and desktops.
Reference:Lightning Component Framework Overview
Incorrect Options:
B:Agile processes are not part of the Lightning framework itself.
C & D:These are not features provided by the Lightning framework.
質問 # 118
In the following example, which starting context will mymethod execute it is invoked?
- A. Sharig rules will be inherited from the calling context.
- B. Sharig rules will not be enforced for the running user.
- C. Sharig rules will be enforced for the running user.
- D. Sharig rules will be enforced by the instartiating class.
正解：A
質問 # 119
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?
- A. Validation rule
- B. Apex trigger
- C. Controller extension
- D. Custom controller
正解：D
解説：
A custom controller is an Apex class that uses the default, no-argument constructor for the outer, top-level class. You cannot create a custom controller constructor that includes parameters. A custom controller is needed to perform complex validation that involves multiple objects and then redirect the user to another Visualforce page upon success. A custom controller can override the standard actions of a standard controller, such as save, edit, view, or delete, and define new actions. A custom controller runs in system mode, so the user's permissions and field-level security do not apply. References: You can find more information about custom controllers in the Visualforce Developer Guide and the Apex Developer Guide on Salesforce's official website.
質問 # 120
Given the following block code: try{ List <Accounts> retrievedRecords = [SELECT Id FROM Account WHERE Website = null]; }catch(Exception e){ //manage exception logic } What should a developer do to ensure the code execution is disrupted if the retrievedRecordslist remains empty after the SOQL query?
- A. Check the state of the retrievedRecords variable and use System.assert(false) if the variable is empty
- B. Check the state of the retrievedRecords variable and access the first element of the list if the variable is empty.
- C. Replace the retrievedRecords variable declaration from a List of Account to a single Account.
- D. Check the state of the retrieveRecords variable and throw a custom exception if the variable is empty.
正解：A
質問 # 121
A developer executes the following code in the Developer Console:
List<Account> fList = new List <Account> ();For(integer i= 1; I <= 200; i++){fList.add(new Account ( Name
= 'Universal Account ' + i));}Insert fList;List <Account> sList = new List<Account>();For (integer I = 201; I
<
20000; i ++){sList.add(new Account (Name = 'Universal Account ' + i));}Insert sList;How many accounts are created in the Salesforce organization ?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
質問 # 122
Which governor limit applies to all the code in an apex transaction?
- A. Elapsed SOQL query time
- B. Number of classes called
- C. Elapsed CPU time
- D. Number of new records created
正解：C
質問 # 123
Cloud kicks has a muli-screen flow its call center agents use when handling inbound service desk calls.
At one of the steps in the flow, the agents should be presented with a list of order number and dates that are retrieved from an external odrer management system in real time and displayed on the screen.
What shuold a developer use to satisfy this requirement?
- A. An Apex Controller
- B. An apex REST class
- C. An invocae method
- D. An outbound message
正解：B
解説：
A developer should use an Apex REST class to satisfy this requirement. An Apex REST class can expose a custom REST API that can be called from an external system, such as an order management system, to retrieve data in real time and return it in JSON or XML format1. The developer can then use the @InvocableMethod annotation on a method in the Apex REST class to make it available as an action in Flow Builder2. The developer can then use this action in the multi-screen flow to display the list of order number and dates on the screen for the call center agents. References:
* 1: Apex REST Methods | Apex Developer Guide | Salesforce Developers
* 2: Customize Order Management Flows Unit | Salesforce Trailhead
質問 # 124
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