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C++ and OOPS Sample Question

  1. What are models and meta models?
    Model:
    It is a complete description of something (i.e. system).

    Meta model:
    It describes the model elements, syntax and semantics of the notation that allows their manipulation.

  2. What do you meant by static and dynamic modeling?
    Static modeling is used to specify structure of the objects that exist in the problem domain. These are expressed using class, object and USECASE diagrams.

    But Dynamic modeling refers representing the object interactions during runtime. It is represented by sequence, activity, collaboration and statechart diagrams.

  3. Why generalization is very strong?
    Even though Generalization satisfies Structural, Interface, Behaviour properties. It is mathematically very strong, as it is Antisymmetric and Transitive. Transitive: A=>B, B=>c then A=>c.
    A. Salesman.
    B. Employee.
    C. Person.

    Note:

    All the other relationships satisfy all the properties like Structural properties, Interface properties, Behaviour properties.
  4. Differentiate Aggregation and containment?
    Aggregation is the relationship between the whole and a part. We can add/subtract some properties in the part (slave) side. It won't affect the whole part.

    Best example is Car, which contains the wheels and some extra parts. Even though the parts are not there we can call it as car.

    But, in the case of containment the whole part is affected when the part within that got affected. The human body is an apt example for this relationship. When the whole body dies the parts (heart etc) are died.

  5. Can link and Association applied interchangeably?
    No, You cannot apply the link and Association interchangeably. Since link is used represent the relationship between the two objects.
    But Association is used represent the relationship between the two classes.
    link :: student:Abhilash course:MCA
    Association:: student course
  6. what is meant by "method-wars"?
    Before 1994 there were different methodologies like Rumbaugh, Booch, Jacobson, Meyer etc who followed their own notations to model the systems. The developers were in a dilemma to choose the method which best accomplishes their needs. This particular span was called as "method-wars"
  7. Whether unified method and unified modeling language are same or different?
    Unified method is convergence of the Rumbaugh and Booch.
    Unified modeling lang. is the fusion of Rumbaugh, Booch and Jacobson as well as Betrand Meyer (whose contribution is "sequence diagram"). Its' the superset of all the methodologies.

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