All the OOP languages like Java, Python, C++, .Net, etc. have this concept.
In this thread, we'll try to understand it from Java's standpoint.
OOPs Concept in Java
a thread...
All the OOP languages like Java, Python, C++, .Net, etc. have this concept.
In this thread, we'll try to understand it from Java's standpoint.
1. Object
2. Class
3. Inheritance
4. Encapsulation
5. Abstraction
6. Polymorphism
Let's understand them one by one...
Look around you, whatever you see can be considered an Object.
For eg: The chair you are sitting on, the table, your computer, your house, windows, your pet, you yourself!
An object has Behaviour (things it does or performs) and Attributes (things that describe it).
Note: B = Behavior, A = Attribute
Chair:
B - Moves, Adjust Height, Recline, etc.
A - Built Material, Color, Make & Model, Brand, Price, etc.
You:
B - Eat, Play, Watch Netflix, Sleep, etc.
A - Height, Weight, Age, DOB, Name, SSN, etc.
The collection of all related objects is called Class.
Consider class as a general category which contains all the related objects inside it.
Eg:
Objects like Wheel chair, Office Chair, Wooden Chair can be apart of "Chair" class.
"Table" Class can have different objects like Study Table, Office Table, Dining Table, etc.
"Vehicle" Class has Car, Truck, Bus, Plane as Objects.
"Car" Class can have Sedans, SUVs, HatchBacks, and Mini SUVs as Objects.
and many more like this...
The way we inherited a few qualities from our parents like few look like their father, few skin types are the same as their mother, hairs, nails, height, body, etc.
Similarly,
A class can also inherit the qualities from a parent class.
Phone Class can have two Child Classes:
TelePhone
MobilePhone
Both these child classes can inherit the "calling" behavior.
It means wrapping data into a single unit and securing it.
For eg:
Drug Capsule: Wraps different medicines into a single unit and protect them from outside environment.
Bank Locker: Wraps your valuables into a single unit(locker) and protects it via passcode.
Encapsulation hides the data and wraps it in a single unit. It helps in two ways - a) It protects the data from any misuse by hiding it and b) Provides easy access to relevant data with a single unit by wrapping it.
Hiding complexity from the user and showing only the relative stuff.
For Eg:
Car - All the complexity like engine, machinery, etc is hidden from you and only relevant part is shown like the brakes, accelerator, and gearbox.
ATM Machine:
User is only given a option to insert card, take cash, enter PIN,etc. While the other complexities like communication with the bank server, validating PIN, checking balance, etc is hidden from user.
Abstraction helps in making a User-Friendly system and also protects it from doing any harm to our system by hiding the complexity. So that user can only focus on relative things.
Abstraction hides the Implementation details (complexity) and secures implementation, not data.
Encapsulation hides the data and secures it from unwanted use.
It means many forms. With the same name, it provides different forms.
For eg:
In Chess, we've 6 pieces - king, rook, bishop, queen, knight, and pawn. All of them "move" differently i.e. Bishop moves diagonally, Rooks move horizontal and vertical, etc.
More from Vikas Rajput
You May Also Like
"I lied about my basic beliefs in order to keep a prestigious job. Now that it will be zero-cost to me, I have a few things to say."
We know that elite institutions like the one Flier was in (partial) charge of rely on irrelevant status markers like private school education, whiteness, legacy, and ability to charm an old white guy at an interview.
Harvard's discriminatory policies are becoming increasingly well known, across the political spectrum (see, e.g., the recent lawsuit on discrimination against East Asian applications.)
It's refreshing to hear a senior administrator admits to personally opposing policies that attempt to remedy these basic flaws. These are flaws that harm his institution's ability to do cutting-edge research and to serve the public.
Harvard is being eclipsed by institutions that have different ideas about how to run a 21st Century institution. Stanford, for one; the UC system; the "public Ivys".
As a dean of a major academic institution, I could not have said this. But I will now. Requiring such statements in applications for appointments and promotions is an affront to academic freedom, and diminishes the true value of diversity, equity of inclusion by trivializing it. https://t.co/NfcI5VLODi
— Jeffrey Flier (@jflier) November 10, 2018
We know that elite institutions like the one Flier was in (partial) charge of rely on irrelevant status markers like private school education, whiteness, legacy, and ability to charm an old white guy at an interview.
Harvard's discriminatory policies are becoming increasingly well known, across the political spectrum (see, e.g., the recent lawsuit on discrimination against East Asian applications.)
It's refreshing to hear a senior administrator admits to personally opposing policies that attempt to remedy these basic flaws. These are flaws that harm his institution's ability to do cutting-edge research and to serve the public.
Harvard is being eclipsed by institutions that have different ideas about how to run a 21st Century institution. Stanford, for one; the UC system; the "public Ivys".
