Apex Developer Guide

Apex Developer Guide
Getting Started with Apex
Writing Apex
Data Types and Variables
Control Flow Statements
Classes, Objects, and Interfaces
Classes
Interfaces
Keywords
Using the final Keyword
Using the instanceof Keyword
Using the super Keyword
Using the this Keyword
Using the transient Keyword
Using the with sharing, without sharing, and inherited sharing Keywords
Annotations
Classes and Casting
Differences Between Apex Classes and Java Classes
Class Definition Creation
Namespace Prefix
Apex Code Versions
Lists of Custom Types and Sorting
Using Custom Types in Map Keys and Sets
Working with Data in Apex
Running Apex
Debugging, Testing, and Deploying Apex
Apex Language Reference
Appendices
Glossary
PDF

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Using the super Keyword

The super keyword can be used by classes that are extended from virtual or abstract classes. By using super, you can override constructors and methods from the parent class.

For example, if you have the following virtual class:
You can create the following class that extends Superclass and overrides its printName method:

The expected output when calling Subclass.printName is My name is Mr. Vonderburg. But you can call me Carl.

You can also use super to call constructors. Add the following constructor to SubClass:

Now, the expected output of Subclass.printName is My name is Madam Clapentrap. But you can call me Brenda.

Best Practices for Using the super Keyword

  • Only classes that are extending from virtual or abstract classes can use super.
  • You can only use super in methods that are designated with the override keyword.