Differentiate persistent & non-persistent
objects?
Persistent refers to an object's ability to transcend time or space. A
persistent object stores/saves its state in a permanent storage system with out
losing the information represented by the object.
A non-persistent object is said to be transient or ephemeral. By default objects
are considered as non-persistent.
What do you meant by active and passive
objects?
Active objects are one which instigate an interaction which owns a thread and
they are responsible for handling control to other objects. In simple words it
can be referred as client.
Passive objects are one, which passively waits for the message to be processed.
It waits for another object that requires its services. In simple words it can
be referred as server.
What is meant by software development
method?
Software development method describes how to model and build software systems in
a reliable and reproducible way. To put it simple, methods that are used to
represent ones' thinking using graphical notations.
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.
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.
Why generalization is very strong?
Even though Generalization satisfies Structural, Interface, Behaviour
properties. It is mathematically very strong, as it is Antisymmetric and
Transitive.
Antisymmetric:
employee is a person, but not all persons are employees. Mathematically all As’
are B, but all Bs’ not A.
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, Behavior properties.
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.
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
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"
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.
Who were the three famous amigos and what
was their contribution to the object community?
The Three amigos namely,
Ø James Rumbaugh (OMT): A veteran in analysis who came up with an idea
about the objects and their Relationships (in particular
Associations).
Ø Grady Booch: A veteran in design who came up with an idea about
partitioning of systems into subsystems.
Ø Ivar Jacobson (Objectory): The father of USECASES, who described about
the user and system interaction.
Why does the function arguments are called
as "signatures"?
The arguments
distinguish functions with the same name (functional polymorphism). The name
alone does not necessarily identify a unique function. However, the name
and its arguments (signatures) will uniquely identify a function.
In real life
we see suppose, in class there are two guys with same name, but they can be
easily identified by their signatures. The same concept is applied here.
ex:
class person
{
public:
char getsex();
void setsex(char);
void setsex(int);
};
In the above
example we see that there is a function setsex() with same name but with
different signature.
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