Force.com Apex Code Developer's Guide

Getting Started
Writing Apex
Data Types and Variables
Control Flow Statements
Conditional (If-Else) Statements
Loops
Do-While Loops
While Loops
For Loops
Traditional For Loops
List or Set Iteration for Loops
Iterating Collections
Classes, Objects, and Interfaces
Working with Data in Apex
Ways to Invoke Apex
Finishing Touches
Reference
Appendices
Glossary
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List or Set Iteration for Loops

The list or set iteration for loop iterates over all the elements in a list or set. Its syntax is:
1for (variable : list_or_set) {
2    code_block
3}
where variable must be of the same primitive or sObject type as list_or_set.

When executing this type of for loop, the Apex runtime engine assigns variable to each element in list_or_set, and runs the code_block for each value.

For example, the following code outputs the numbers 1 - 10 to the debug log: 
1Integer[] myInts = new Integer[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
2
3for (Integer i : myInts) {
4    System.debug(i);
5}