Java Class Diagram Interface. First of all collection and collections are two different concepts. The attributes are written one attribute per line.
A dashed line with a hollow closed arrow at one end indicates that a class implements an interface. A class consists of its objects and also it may inherit from other classes. The arrow points to the base class.
Since interfaces are declarations they are not instantiable.
First of all collection and collections are two different concepts. The arrow points to the base class. The second i in uml class diagrams are interfaces. The other two classes each extend the payment class and represent two different methods of payment.
