Force.com Apex Code Developer's Guide

Getting Started
Writing Apex
Data Types and Variables
Control Flow Statements
Conditional (If-Else) Statements
Loops
Classes, Objects, and Interfaces
Working with Data in Apex
Ways to Invoke Apex
Finishing Touches
Reference
Appendices
Glossary
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Control Flow Statements

Apex provides statements that control the flow of code execution.

Statements are generally executed line by line, in the order they appear. With control flow statements, you can cause Apex code to execute based on a certain condition or you can have a block of code execute repeatedly. This section describes these control flow statements: if-else statements and loops.