PD1 Developer Fundamentals 4

Question 1

Which Apex collection type enforces uniqueness of its elements and does not maintain insertion order?

Accepted Answer

Set

Answer

An Apex Set stores unique values only and does not guarantee any particular ordering of its elements.

Question 2

What is the result of calling String.valueOf(null) in Apex?

Accepted Answer

Returns the string 'null'

Answer

String.valueOf(null) returns the literal string 'null' rather than throwing an exception.

Question 3

In Apex, which access modifier makes a method available to any Apex code in any namespace?

Accepted Answer

global

Answer

The global modifier exposes a method to all Apex code across all namespaces, including managed packages.

Question 4

A developer defines 'public virtual class Animal' and 'public class Dog extends Animal'. What is required for Dog to override a method from Animal?

Accepted Answer

The method in Animal must be marked 'virtual' or 'abstract', and Dog must use 'override' keyword

Answer

In Apex, methods can only be overridden if declared virtual or abstract in the parent class, and the subclass must use the override keyword.

Question 5

What does the 'with sharing' keyword enforce in an Apex class?

Accepted Answer

The class respects the running user's record-level sharing rules

Answer

With sharing enforces the running user's org-wide defaults, role hierarchy, and sharing rules when accessing records.

(PD1) Salesforce Certified Platform Developer 1 Practice Test