GraphSummit Stockholm - Neo4j - Knowledge Graphs and Product Updates
Analyzing a system and specifying the requirements
1.
2. frequent communication with users .
Requirements analysis is a team effort.
demands a combination of hardware software
and human factors engineering expertise as well
as skills in dealing with people.
3. There are two types:-
•Structured approach
•Object oriented approach
6. Requirements :-
bridging the gap between system requirements
engineering and software design.
Provides software designer with a model of : -
• System information
• Function
• Behavior
Model can be translated to data, architectural, and
component-level designs.
Expect to do a little bit of design during analysis and a
little bit of analysis during design.
7. Requirements :-
Types of Requirements - 1
Functional requirements:
input/output
processing.
error handling.
Non-functional requirements:
Physical environment (equipment locations,
multiple sites, etc.).
Interfaces (data medium etc.).
User & human factors (who are the users, their
skill level etc.).
8. Requirements :-
Types of Requirements - 2
Non-functional requirements (continued):
Performance (how well is system functioning).
Documentation.
Data (qualitative stuff).
Resources (finding, physical space).
Security (backup, firewall).
Quality assurance (max. down time, MTBF, etc.).
10. Implementation :-
Implementation is the realization of an
application, or execution of :-
plan
model
Design
specification
standard
algorithm
11. Verification :-
System Verifications a set of actions used to check
the correctness of any element
Dynamic verification
Static verification
There are two fundamental approaches to
verification: -
13. OBJECT ORIENTED APPROACH :-
principles of object oriented (OO) approach is that
of abstraction, not of data structures and processes
separately but both together.
An object is a set of data structures and the methods
or operations needed to access those structures.
14. The key ideas of the object oriented
Approach are :-
Objects
Encapsulation
Class
Inheritance
Instances and Instantiation
Methods and Messages
15. Objects :-
In the class-based object-oriented "object"
refers to a particular instance of a class .
where the object can be a combination of
variables, functions, and data structures.
In relational database management, an object
can be a table or column, or an association
between data and a database entity.
The main purpose of object is reuse the code.
16. Encapsulation :-
Encapsulation is manipulate the data, and
that keeps both safe from outside interference
and misuse.
Data encapsulation led to the important
OOP concept of data hiding.
17. Encapsulation (continue) :-
Example :-
class Account
{
private double accountBalance;
public withdraw();
public deposit();
public determineBalance();
} //class Account
Account
balance
Message
Message
Message
18. Class :-
A class is a blueprint of prototype.
Class is the implementation of an abstract data type
and so encapsulate both data and operation.
Object is run time instance of class.
Classes just sit there ,Objects do the real work.
Memory is allocated for Objects not for classes.
19. programming, computer programs are designed
by making them out of objects that interact with
one another.
here is significant diversity in object-oriented
programming.
most popular languages are class-based,
meaning that objects are instances of classes which
typically also determines their type.
Inheritance :-
20. Instances and Instantiation :-
In programming, instantiation is the creation of
a real instance or particular realization of an
abstraction or template such as a class of
objects or a computer process.
21. Instance (computer science) :-
In object-oriented programming (OOP),
an instance is a concrete occurrence of any object,
existing usually during the runtime of a computer
program.
Formally, "instance" is synonymous with "object" as
they are each a particular value (realization), and
these may be called an instance object; "instance"
emphasizes the distinct identity of the object.
The creation of an instance is called instantiation.
22. Methods and Messages :-
One of the most important capabilities that a
method provides is method overriding.
Method in java programming sets the behavior of
class object.
For example:- area .
23. Methods and Messages (continue):-
Methods also provide the interface that other
classes use to access and modify the data
properties of an object.(encapsulation)
Encapsulation and overriding are the two
primary distinguishing features between
methods and procedure calls.
24. Methods and Messages (continue):-
Class
1.Fields
2.Constructors
3.methods
class Account {
int accountNumber;
int accountBalance;
Public Account(double account) {
accountBalance=Amount;
}
Public int getAccountNumber() {
return accountNumber; //message
}
Public void deposit (double account) {
accountBalance=Amount;
}
Public int getBalancer() {
return accountBalance; //message
}
}
