System Analysis and Design

Question Four 1.5 Marks Consider an abstract class Duck, representing all available ducks. Every duck can quack and walk, which are their publicly accessible functionalities. While every duck walks the same way, they quack differently which makes quacking an abstract feature of a duck. Every duck has a weight which determines their ability to float, which can be checked by everybody through canFloat method. The weight of a duck can be set through a method available only for all concrete duck implementations. A rubber duck, a kind of a duck, has all the features of a duck (yes, it quacks), but when asked to walk - it acts differently, because a rubber duck can't walk, so it overrides a duck walk feature and does nothing. Another example of a duck is a wild duck that apart of quacking and walking, can also fly. Draw a class diagram depicting classes, with names, attributes and methods along with proper relationship between classes. Skip constructors and destructors, but don't forget to annotate elements visibility using UML notation. For the actual attributes types or method signatures you can use Java notation, if you wish. Precede a name with a symbol to indicate slanted (italicized) text Answeri