Salesforce Updated CRT-450 Exam Questions and Answers by wren

To create a class that provides the capabilities defined by multiple interfaces, the class must use the implements keyword followed by a comma-separated list of the interface names. The class must also provide the implementation for all the methods declared in the interfaces. The extends keyword is used for inheritance, not for implementing interfaces. Therefore, option C is the correct implementation of the DrawList class that implements both the Sortable and Drawable interfaces. References: Interfaces | Apex Developer Guide, Cert Prep: Platform Developer I: Developer Fundamentals

 A trigger may fire multiple times during a transaction because of the order of execution of different automation tools in Salesforce. According to the documentation, the order of execution is as follows:

• Executes all before triggers.
• Saves the record to the database, but doesn’t commit yet.
• Executes all after triggers.
• Executes assignment rules.
• Executes auto-response rules.
• Executes workflow rules.
• If there are workflow field updates, updates the record again.
• If the record was updated with workflow field updates, fires before update triggers and after update triggers one more time (and only one more time), in addition to standard validations. Custom validation rules, duplicate rules, and escalation rules are not run again.
• Executes processes and flows launched via processes and flow trigger workflow actions. When a process or flow executes a DML operation, the affected record goes through the save procedure.
• Executes escalation rules.
• Executes entitlement rules.
• If the record contains a roll-up summary field or is part of a cross-object workflow, performs calculations and updates the roll-up summary field in the parent record. Parent record goes through save procedure.
• If the parent record is updated, and a grandparent record contains a roll-up summary field or is part of a cross-object workflow, performs calculations and updates the roll-up summary field in the grandparent record. Grandparent record goes through save procedure.
• Executes Criteria Based Sharing evaluation.
• Commits all DML operations to the database.
• Executes post-commit logic, such as sending email.

As you can see, there are several steps that can cause the record to go through the save procedure again, which will fire the triggers again. Therefore, the developer should consider this possibility and write the trigger code accordingly to avoid unwanted side effects or recursion. For example, the developer can use static variables to track the trigger invocation or use bulkified patterns to handle collections of records efficiently.

References:

• 1: Order of Execution (Apex Developer Guide)

Cascading delete operations occur when a record that has a master-detail relationship with another record is deleted, and the child records are also deleted as a result. This action may cause triggers to fire on both the parent and the child records, depending on the trigger definition and the operation type. For example, if a trigger is defined on the child object to execute after delete, it will fire when the parent record is deleted and the child records are cascaded. Similarly, if a trigger is defined on the parent object to execute before delete, it will fire when the parent record is deleted and before the child records are cascaded. However, updates to feed items, renaming or replacing a picklist entry, and changing a user’s default division do not directly cause triggers to fire, unless they are part of a larger transaction that involves a DML operation on a trigger-enabled object. References: Triggers and Merge Statements, Triggers and Recovered Records, Triggers

The result of the following code is that the record will not be created and an exception will be thrown. This is because the code is trying to insert a record with a null value for a required field, which violates the database constraints and causes a DMLException1. The code does not handle the exception with a try-catch block, so the exception will propagate to the caller and terminate the execution2. The debug log will show the exception message and stack trace, but the record will not be inserted in the database.

Java

Account a = new Account();

a.Name = null;

insert a;

AI-generated code. Review and use carefully. More info on FAQ.

The other options are incorrect. Option B is incorrect because the record will not be created and the debug log will show an exception, not a message. Option C is incorrect because the record will not be created and an error will be reported as an exception. Option D is incorrect because the record will not be created and an error will be reported as an exception. References:

• DMLException Class | Apex Developer Guide | Salesforce Developers
• Exception Handling | Apex Developer Guide | Salesforce Developers