Creating collection of classes

Hi Experts.
I need a little help here please.
I have a database processing app here with a few dozens of static classes. Each class basically represents a class. All classes have a simular structure..
I need to be able to loop through all those classes somehow to execute them. I realize i can just write out something like:
class1.execute();
class21.execute();
class3.execute();
class4.execute();
.
.
.
but I have a feeling there must be an easier way. Maybe I can connect them all with the interface somehow ? create a collection and loop through ? I'm not an expert on this yet so please help.
Thanks in advance!