Notes from the Reading

Classes collect related functions (methods), variables (properties), and other relevant items.



Document Class
allows you to create a custom class that can be used as a type of timeline
replacement

1:  package {  
2:  import flash.display.MovieClip;  
3:  public class Main extends MovieClip {  
4:  public function Main() {  
5:  trace("Flash");  
6:  }  
7:  }  
8:  }  

Classpaths
To use a class in a
specific subdirectory, you need to import the class, including the classpath

import flash.display.MovieClip;
import myapp.effects.Water;
import flash.events.*;

package myapp.effects {
public class Water {
public function Water() {
}
}
}

Composition   
aggregation

Composition says that an object can be composed of other objects, rather
than descend from other objects.