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layout: docpage title: ActionScript Packages description: Packages in ActionScript 3 permalink: /features/as3/packages

ActionScript Packages

Packages in ActionScript 3

Code in ActionScript is structured the same way Java code is structured. Each ActionScript file must declare its package and wrap any externally visible class in the package. A top level package does not need a name. So for a Foo class at the top level, it would look like this:

package {
	class Foo {
		public function Foo() {
		}
	}
}

You can name your folder structure any way you like, but an accepted convention is to nest it in a unique domain to prevent potential package conflicts. So for a class MyFoo you might have a folder structure like this: src/com/acme/MyFoo.as and the class would look like this:

package com.acme {
	class MyFoo {
		public function MyFoo() {
		}
	}
}

Always structure your packages, so all classes have a unique qualified path.