Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Making Common Behaviour Abstract
Let us define abstraction "Abstraction means to focus on the necessary, inherent aspects of an entity and ignoring its accidental features". Or we can say, if a set of operations and/or attributes seem to be repeated in two classes. There is a chance of applying inheritance. It is possible that two classes are really specialised variations of something when viewed at a higher level of abstraction.
When general behaviour has been recognised, a common super class can be created which implements the shared features, leaving only specialised features in subclasses. This transformation of the object model is known as abstracting out a common super class or common behaviour. Generally, the resulting super class is abstract, meaning that there are no direct instances of it, but behaviour it defines belongs to all instances of its subclasses. Such as, again we take a draw operation of any geometric figure on display screen requires setup and rendering of geometry. The rendering varies between different figures, such as circles, , spines and lines, but the setup, such as setting the colour, line thickness and other parameters, can be inherited directly by all figure classes from abstract class figure.
The creation of abstract super classes also enhances the extensibility of software product, by keeping space for further addition on base of abstract class
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
Differentiate between horizontal & mixed horizontal fragmentation?
find the name of supplier who supply some red part
Objectives After reading this part, you should be able to: Modify, create, and delete database schema objects; Update database using SQL command; Retrieve data f
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
Create a table according to given data: AmbulanceDriver(Driver_Number#, Name, Address, Birth_Date) AmbulanceDriverTeam(Team_Number#, Driver_Number#, Join_Date, Lea
Explain the EXEC statement in SQL Ans: All statements which start with EXEC SQL are embedded SQL database statements. High level languages such as C can be employed to write a
What are the typical phases of query processing
Differentiate between a Global and a Local temporary table? - A local temporary table exists only for the duration of a connection or if defined inside a compound statement, fo
Define Signal. It allows methods to respond to events triggered by themselves or by other processes. Each signal corresponds to an exacting event. A signal is represented in Sy
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd