Apex Developer Guide

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Apex Developer Guide
Release Notes
Getting Started with Apex
Writing Apex
Data Types and Variables
Control Flow Statements
Conditional (If-Else) Statements
Switch Statements
Loops
Do-While Loops
While Loops
For Loops
Classes, Objects, and Interfaces
Working with Data in Apex
Running Apex
Debugging, Testing, and Deploying Apex
Apex Reference
Appendices
PDF

While Loops

The Apex while loop repeatedly executes a block of code as long as a particular Boolean condition remains true. Its syntax is:
while (condition) {
    code_block
}

Curly braces ({}) are required around a code_block only if the block contains more than one statement.

Note

Unlike do-while, the while loop checks the Boolean condition statement before the first loop is executed. Consequently, it is possible for the code block to never execute.

As an example, the following code outputs the numbers 1 - 10 into the debug log:
Integer count = 1;

while (count < 11) {
    System.debug(count);
    count++;
}