Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience : DEX-450 Exam Questions

Exam Code: DEX-450
Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience
Updated: Oct 14, 2026
Q&As: 202 Questions and Answers

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About Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Exam Braindumps

Who should take the Salesforce DEX-450 Exam

This course is designed for programme developers starting on the Salesforce platform who require programming customizations on Apex and Visualforce business logic as well as on user interface layers. There are no prerequisites for Salesforce DEX-450 Exam.

Programmatic developers.

Reference: https://trailhead.salesforce.com/en/academy/classes/dex450-build-applications-programmatically-on-the-salesforce-platform/

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How to Prepare for Salesforce DEX-450 Exam

Preparation Guide for Salesforce DEX-450 Exam

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Salesforce DEX-450 Exam Syllabus Topics:

Section	Weight	Objectives
Apex Testing	13%	- Testing Best Practices 1. Using seeAllData=false for isolated tests 2. Assert statement usage 3. Coverage requirements (75% for deployment) - Test Classes 1. @isTest annotation 2. Test data creation methods 3. Test.startTest() and Test.stopTest()
Apex Classes and Interfaces	12%	- Apex Interfaces 1. When to use interfaces 2. Interface definition and implementation - Apex Classes 1. Access modifiers (public, private, protected, global) 2. Class structure (attributes, methods, constructors) 3. Inheritance and virtual/abstract classes
Visualforce Pages	8%	- VF Page Basics 1. Visualforce expressions 2. Controllers and controller extensions 3. component structure - VF Standard Components 1. Action methods and pageReference 2. , 3. , ,
Apex Triggers	12%	- Trigger Best Practices 1. One trigger per object pattern 2. Handler class patterns 3. Recursive trigger prevention - Trigger Syntax and Context Variables 1. Trigger.old and Trigger.new context variables 2. Trigger.newMap and Trigger.oldMap 3. Trigger events (before insert, after insert, etc.)
Working with Data - SOQL and SOSL	15%	- SOSL (Salesforce Object Search Language) 1. Returning sObjects from SOSL 2. SOSL syntax and use cases - SOQL (Salesforce Object Query Language) 1. Relationship queries (parent-child, child-parent) 2. Query options (LIMIT, ORDER BY, WHERE) 3. Aggregate functions (COUNT, SUM, AVG, MIN, MAX) 4. Basic SOQL queries
Asynchronous Apex	10%	- Batch Apex 1. start(), execute(), and finish() methods 2. Database.Batchable interface 3. Database.Stateful - Future Methods 1. @future annotation 2. AsyncRequestLimit exceeded handling
Apex Transaction Management	10%	- Governor Limits 1. DML statement limits 2. CPU time and heap size limits 3. SOQL query limits - Transaction Control 1. System.debug() usage 2. Savepoint and rollback 3. Database methods with allOrNone parameter
Apex Fundamentals	10%	- Apex Basics 1. DML operations (insert, update, delete, etc.) 2. Apex variables and data types 3. Apex operators and control flow statements 4. Using SOQL to query Salesforce data - Apex Primitives 1. ID and sObject types 2. Date, Datetime, Time classes 3. Integer, Double, Long, String, Boolean types