Apex Developer Guide

Getting Started
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
Understanding Rules of Conversion
Control Flow Statements
Classes, Objects, and Interfaces
Working with Data in Apex
Ways to Invoke Apex
Finishing Touches
Reference
Appendices
Glossary
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Collections

Apex has the following types of collections:

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

Note