Salesforce Apex Programming – Learn Apex Development | eLearning Salesforce

Salesforce Apex Programming

Master the Salesforce proprietary language to build robust business logic and applications on the Salesforce platform. Learn Apex from basics to advanced concepts with interactive examples.

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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. Apex enables developers to add business logic to system events, such as button clicks, related record updates, and Visualforce pages.

Key Characteristics of Apex:

Integrated with Salesforce CRM data and metadata
Strongly typed and object-oriented
Supports triggers similar to database triggers
Runs on the Lightning Platform (multitenant environment)
Provides transaction and rollback management

Apex Code Examples

Explore practical Apex code examples that demonstrate common use cases in Salesforce development.

Sample Apex Class

AccountProcessor.cls

public class AccountProcessor {
    // Method to update account description
    public static void updateAccountDescription(List<Id> accountIds) {
        List<Account> accountsToUpdate = new List<Account>();
        
        for (Account acc : [SELECT Id, Name, NumberOfEmployees 
                          FROM Account 
                          WHERE Id IN :accountIds]) {
            acc.Description = AccountProcessor.generateDescription(acc);
            accountsToUpdate.add(acc);
        }
        
        if (!accountsToUpdate.isEmpty()) {
            update accountsToUpdate;
        }
    }
    
    private static String generateDescription(Account acc) {
        return 'Account: ' + acc.Name + ' has ' + acc.NumberOfEmployees + ' employees.';
    }
}

Sample Apex Trigger

OpportunityTrigger.trigger

trigger OpportunityTrigger on Opportunity (before insert, before update) {
    
    if (Trigger.isBefore && (Trigger.isInsert || Trigger.isUpdate)) {
        for (Opportunity opp : Trigger.new) {
            // Validate close date is not in the past
            if (opp.CloseDate < Date.today()) {
                opp.addError('Close Date cannot be in the past.');
            }
            
            // Auto-calculate amount if not provided
            if (opp.Amount == null && opp.Probability != null) {
                opp.Amount = opp.ExpectedRevenue / (opp.Probability / 100);
            }
        }
    }
}

Test Your Apex Knowledge

Take this interactive quiz to check your understanding of Apex programming concepts.

1. What is the governor limit for SOQL queries in a single Apex transaction?

100 SOQL queries

50 SOQL queries

200 SOQL queries

Unlimited queries

2. Which keyword is used to define a class that can’t be inherited in Apex?

abstract

final

static

sealed

3. What is the purpose of the “with sharing” keyword in Apex?

It allows sharing of class variables

It enforces the user’s sharing rules

It enables class inheritance

It improves query performance

Apex Programming Topics

Explore essential Apex programming concepts through our structured learning path.

Apex Basics

Variables, data types, operators, and control structures in Apex.

Classes & Methods

Object-oriented programming, class design, and method implementation.

Triggers

Before/after triggers, trigger context variables, and bulkification.

SOQL & SOSL

Salesforce Object Query Language and Salesforce Object Search Language.

Governor Limits

Understanding and working within Salesforce platform limits.

Testing & Debugging

Test classes, code coverage, debugging techniques, and best practices.