Apex Developer Guide

Apex Developer Guide
Getting Started with Apex
Writing Apex
Data Types and Variables
Data Types
Primitive Data Types
Collections
Lists
Sets
Maps
Parameterized Typing
Enums
Variables
Constants
Expressions and Operators
Assignment Statements
Rules of Conversion
Control Flow Statements
Classes, Objects, and Interfaces
Working with Data in Apex
Running Apex
Debugging, Testing, and Deploying Apex
Apex Reference
Appendices
Glossary
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Collections

Collections in Apex can be lists, sets, or maps.

There is no limit on the number of items a collection can hold. However, there is a general limit on heap size.

Note