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Salesforce Platform Developer I Certification Guide

You're reading from   Salesforce Platform Developer I Certification Guide Expert tips, techniques, and mock tests for the Platform Developer I (DEV501) certification exam

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Product type Paperback
Published in May 2019
Publisher Packt
ISBN-13 9781789802078
Length 546 pages
Edition 1st Edition
Languages
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Authors (2):
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Jan Vandevelde Jan Vandevelde
Author Profile Icon Jan Vandevelde
Jan Vandevelde
Gunther Roskams Gunther Roskams
Author Profile Icon Gunther Roskams
Gunther Roskams
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Toc

Table of Contents (15) Chapters Close

Preface 1. Section 1: Fundamentals, Data Modeling, and Management
2. Salesforce Fundamentals FREE CHAPTER 3. Understanding Data Modeling and Management 4. Section 2: Logic, Process Automation, and the User Interface
5. Declarative Automation 6. Apex Basics 7. Apex - Beyond the Basics 8. The Salesforce User Interface 9. Section 3: Testing, Debugging, and Exercise
10. Testing in Salesforce 11. Debugging and Deployment Tools 12. Mock Tests 13. Other Books You May Enjoy Appendix

What is a class and an instance?

To go over what we have just done and to explain the concept of a class and an instance a bit more clearly, let's take a look at the following screenshot and explanation:

A class acts as a blueprint to create objects from. In this example, we created a class called Car. This Car class acts as a blueprint to build instances of cars from. So, because it's a blueprint, we define what each car has in the class—these are called member variables (in our case, that's a model, a brand, and a color). We also define actions that a car can perform and what a car can do, and we call these methods! In our car example, we have defined that a car can start, stop, and also accelerate.

Note that there is one special member variable, the count variable, which we declared as static, which means that this is a class variable and not a member...

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