Essential Salesforce Apex Interview Q&A – DevFacts

Salesforce Apex is a powerful programming language that allows developers to create complex business logic and automation within the Salesforce platform. As a result, there is a growing demand for Salesforce Apex developers in the job market. If you are preparing for a job interview as a Salesforce Apex developer, it is important to be ready to answer challenging questions to demonstrate your expertise in the language.

To help you prepare for your upcoming interview, we have compiled a list of the top Salesforce Apex interview questions and provided detailed answers to each question.

1. What is Salesforce Apex?

Salesforce Apex is a strongly typed, object-oriented programming language that allows developers to execute flow and transaction control statements on the Salesforce platform. It is also used to add business logic to most system events, including button clicks, related record updates, and Visualforce pages.

Answer: Salesforce Apex is a development platform that allows developers to extend the capabilities of the Salesforce CRM system, with features including custom controllers, triggers, and web services. It is similar to Java and C# in terms of syntax and structure.

2. What is the difference between a trigger and a class in Salesforce?

A trigger is a piece of code that is executed before or after a record is inserted, updated, or deleted, while a class is a container that holds methods and variables that can be used to perform custom actions in Salesforce.

Answer: Triggers in Salesforce are similar to database triggers in other systems and are used to perform custom actions before or after a record is inserted, updated, or deleted. Classes, on the other hand, are containers for methods and variables that can be used to perform custom actions within Salesforce, such as creating custom controllers for Visualforce pages.

3. What are the different types of collections in Salesforce Apex?

Salesforce Apex supports three types of collections: sets, lists, and maps. Sets are unordered collections of elements with no duplicates, lists are ordered collections of elements, and maps are key-value pairs that allow you to store and retrieve values based on a key.

Answer: Sets in Salesforce Apex are similar to the Set data structure in Java and are used to store unique elements. Lists are similar to the List data structure in Java and are used to store ordered collections of elements. Maps are similar to the Map data structure in Java and are used to store key-value pairs.

4. What is the difference between a trigger.new and trigger.old in Salesforce?

Trigger.new and trigger.old are special context variables in Salesforce triggers that allow you to access the new and old values of a record, respectively. Trigger.new contains the new versions of all the records that are being inserted or updated, while trigger.old contains the old versions of all the records that are being updated or deleted.

Answer: Trigger.new and trigger.old are context variables in Salesforce triggers that allow you to access the new and old values of a record, respectively. Trigger.new is used to access the new versions of records that are being inserted or updated, while trigger.old is used to access the old versions of records that are being updated or deleted.

5. What is the difference between a static and instance method in Salesforce Apex?

A static method is a method that belongs to the class itself and can be called without creating an instance of the class, while an instance method is a method that belongs to an instance of the class and can only be called on that instance.

Answer: In Salesforce Apex, a static method is a method that belongs to the class itself and can be called without creating an instance of the class. An instance method, on the other hand, is a method that belongs to an instance of the class and can only be called on that instance.

These are just a few examples of the types of questions you may encounter in a Salesforce Apex interview. It is important to be well-prepared and confident in your knowledge of the Salesforce Apex programming language in order to impress potential employers. By studying and understanding the concepts and best practices in Salesforce Apex, you can showcase your expertise and set yourself up for success in your job interview. Good luck!