Apex Developer Guide

Apex Developer Guide
Getting Started with Apex
Writing Apex
Data Types and Variables
Control Flow Statements
Classes, Objects, and Interfaces
Working with Data in Apex
Working with sObjects
Data Manipulation Language
SOQL and SOSL Queries
SOQL For Loops
sObject Collections
Lists of sObjects
Sorting Lists of sObjects
Expanding sObject and List Expressions
Sets of Objects
Maps of sObjects
Dynamic Apex
Apex Security and Sharing
Custom Settings
Running Apex
Debugging, Testing, and Deploying Apex
Apex Language Reference
Appendices
Glossary
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Sets of Objects

Sets can contain sObjects among other types of elements.
Sets contain unique elements. Uniqueness of sObjects is determined by comparing the objects’ fields. For example, if you try to add two accounts with the same name to a set, with no other fields set, only one sObject is added to the set.
If you add a description to one of the accounts, it is considered unique and both accounts are added to the set.

If set elements are objects, and these objects change after being added to the collection, they won’t be found anymore when using, for example, the contains or containsAll methods, because of changed field values.

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