Couple Of Programming Questions

Interfaces are like "classes", however, they are composed of only abstract methods. Abstract classes contain at least one abstract method. However, the advantage of an interface is that multiple interfaces can be inherited. Abstract classes, however, can provide concrete methods that do not have to be supplied by the subclass.

A static method or field is one that does not need the class object to be created, to be used. It is useful when you do not want to take up more space with objects.