May 2019
Intermediate to advanced
546 pages
12h 41m
English
Content preview from Salesforce Platform Developer I Certification Guide
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Virtual classes
The third type of reusable functionality of Apex classes is virtual classes. This methodology is the most used in the programming world. This type has more flexibility and more internal functionality than an abstract class.
The virtual classes have more or less the same functionality, but there are some big differences to the abstract classes:
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Abstract classes |
Virtual classes |
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Uses the abstract keyword in class modifier and methods. |
Uses the virtual keyword in class modifier and methods. |
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All abstract methods in the abstract class must be implemented in the child class. |
Not all virtual methods need to be implemented in the child class. If you have five virtual methods, you can decide to implement three of ... |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.