i can't understand how a controller class can exist inside of a class diagram? and if it is possible what roles does it have and how can i detect such a thing? what design patterns can i find about deploying controller classes in class_diagrams? can any body define a controller class for me i think its kind a redundant.
//this part is not a part of my question
//it was a quality check and i have to increase my question characters
//i don't know this is enough or not
//so first try