A Complete Guide to Apex Class in Salesforce

One of the key features that makes Salesforce highly customizable and adaptable is the Apex programming language, since you can use them to create all the backend on an application such as retrieving or updating records.

Complete Apex Class Guide in Salesforce for Beginners

What is an Apex class?

An Apex class is a blueprint for creating custom business logic in Salesforce. It is a fundamental building block of Apex, which is an object-oriented programming language designed specifically for the Salesforce platform.

Apex classes allow developers to define custom methods and data members to perform specific actions, automate processes, and extend the platform's functionality.

Here's a simple example of an Apex class that changes the names of a few accounts. In this example, we will append the text "(New)" to the end of each account name.

public class AccountNameChanger {

    // Method to update the names of 10 accounts by appending "(New)"
    public static void changeAccountNames() {
        List<Account> accountsToUpdate = new List<Account>();
        // Query all accounts
        List<Account> accounts = [SELECT Id, Name FROM Account LIMIT 10];
        // Loop through each account and update the name
        for (Account acc : accounts) {
            acc.Name = acc.Name + " (New)";
        // Update the modified accounts
        if (!accountsToUpdate.isEmpty()) {
            update accountsToUpdate;

Why Apex class is used?

Apex classes are used to extend the capabilities of the Salesforce platform beyond its standard functionalities. Here are some reasons why developers utilize Apex classes:

What are the types of Apex classes?

Salesforce offers three main types of Apex classes:

How to create an Apex class?

Creating an Apex class in Salesforce is straightforward. Follow these steps:

  1. Go to Setup and search for Apex Classes in the Quick Find box.

  2. Click on New to create a new Apex class.

  3. Write your Apex code in the code editor provided.

  4. Save the class by clicking the Save button.

How do I run an Apex class?

Apex classes can be executed in several ways:

When should I use Apex?

Is Apex hard to learn?

For experienced developers, Apex is relatively easy to learn, especially if they have a strong understanding of object-oriented programming languages like Java or C#. Salesforce provides comprehensive documentation, online resources, and developer blogs (Coding Salesforce 🤐) to support the learning process. Beginners may find Apex challenging at the begging, but with dedication and practice, mastering the language is possible in no more than one year.

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