Question

Describe in detail the role of class-oriented metrics in assessing the quality of an OO system. Software engineering.

Answer 1

Before knowing the the role of class-oriented metrics in assessing the quality of an OO system, lets first see what is the meaning of an OO system :

• OO system : OO system or we can say Object Oriented system, are those in which everything was design as class and objects. where objects are real world entity like human, bird, table, etc. And Class is defined as the blueprint of the object. Also there are four features or we can say four fundamentals of object oriented system are abstraction, polymorphism, encapsulation and inheritance.

Now moving on Class oriented matices , see what they have and how they assess the quality of OO system:

Class oriented matrices : First of all it was propoesed by Chidamber and kemerer. It was degined in such a way that take cares of few things as :

• Weighted methods per class : As in every class there are some vaiables and methods(functions) are present. Some methodes are having much more importance and some having less importance than others, so all the methods which are more important are weighted methods. Class oriented matrices are having the weighted methods per class. So it helps in identifying the more valueable methodes in entire class. Methodes in object oriented system are treated as the behaviour of the objects. by this there is assessing of the OO system by its weighted methods.

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• Class oriented matrices having the coupling between the objects and classes. that leads to make an OO system more stable. Coupling normally refers to the having knowledge of others, Like One class have all information of other class , so we can retrive all the information of one class from other class. That leads to assess that our OO system is either in loose coupling or tight coupling.

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• Subclass , or child class can over write a methode of its parent class, that known as methode overriding. Class oreinted matrix have the count of number of the methode that are overriden. So it assess the number of times in which methode overriding have been done, that assess that how much the use of the property of polymorphism is used(as method overriding is the run time polymorphism). Polymorphism is one of the feature of object oriented system.

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• Class oriented matix also have the knowledge of the depth of the inheritance tree. Inheritance refers to the access all the methods or variable of one class from other class. as making one class as child class of other class(Parent class). So it have the depth of the inharitance, that ,means it have record that how many time there is use of the inharitance where used in the program. IT assess that how much the program uses the inheritance in its entire structure.

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