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
Learn Core Java, in 30 days as an Absolute Beginner
a roadmap...
Core Java can be Overwhelming, in the beginning!
Let's see what are those topics you should cover and what you can skip in Core Java.
1. Theoretical Concepts (2 days)
- Features of Java
- JVM, JRE & JDK
- Memory areas in Java
- Basics of how Garbage Collection Works.
2. OOP Concepts (3 days)
- Objects and Classes
- Inheritance
- Polymorphism
- Encapsulation
This topic forms the basis of your Java learning. Spent enough time on this topic and understanding it using real-world examples and some
3. Primitives data types, Operators & Arrays (3 days)
- Various primitives/non-primitives data types, operators
- What is their use, How to use them
- Various sizes of data types
- Arrays, practice a few of its problems
- 2D/3D arrays and their use cases, practice a few problems
a roadmap...
Core Java can be Overwhelming, in the beginning!
Let's see what are those topics you should cover and what you can skip in Core Java.
1. Theoretical Concepts (2 days)
- Features of Java
- JVM, JRE & JDK
- Memory areas in Java
- Basics of how Garbage Collection Works.
2. OOP Concepts (3 days)
- Objects and Classes
- Inheritance
- Polymorphism
- Encapsulation
This topic forms the basis of your Java learning. Spent enough time on this topic and understanding it using real-world examples and some
OOPs Concept in Java
— Vikas Rajput (@vikasrajputin) April 4, 2022
a thread...
3. Primitives data types, Operators & Arrays (3 days)
- Various primitives/non-primitives data types, operators
- What is their use, How to use them
- Various sizes of data types
- Arrays, practice a few of its problems
- 2D/3D arrays and their use cases, practice a few problems
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https://t.co/FBfXhUrH5d
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...we raise the perspective that CoVs can persistently infect bats due to their association with biofilm structures. This phenomenon potentially provides an optimal environment for nonpathogenic & well-adapted viruses to interact with the host, as well as for viral recombination.
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Viruses and other pathogens are often studied as stand-alone entities, despite that, in nature, they mostly live in multispecies associations called biofilms—both externally and within the host.
https://t.co/FBfXhUrH5d
Microorganisms in biofilms are enclosed by an extracellular matrix that confers protection and improves survival. Previous studies have shown that viruses can secondarily colonize preexisting biofilms, and viral biofilms have also been described.
...we raise the perspective that CoVs can persistently infect bats due to their association with biofilm structures. This phenomenon potentially provides an optimal environment for nonpathogenic & well-adapted viruses to interact with the host, as well as for viral recombination.
Biofilms can also enhance virion viability in extracellular environments, such as on fomites and in aquatic sediments, allowing viral persistence and dissemination.
Funny, before the election I recall lefties muttering the caravan must have been a Trump setup because it made the open borders crowd look so bad. Why would the pro-migrant crowd engineer a crisis that played into Trump's hands? THIS is why. THESE are the "optics" they wanted.
This media manipulation effort was inspired by the success of the "kids in cages" freakout, a 100% Stalinist propaganda drive that required people to forget about Obama putting migrant children in cells. It worked, so now they want pics of Trump "gassing children on the border."
There's a heavy air of Pallywood around the whole thing as well. If the Palestinians can stage huge theatrical performances of victimhood with the willing cooperation of Western media, why shouldn't the migrant caravan organizers expect the same?
It's business as usual for Anarchy, Inc. - the worldwide shredding of national sovereignty to increase the power of transnational organizations and left-wing ideology. Many in the media are true believers. Others just cannot resist the narrative of "change" and "social justice."
The product sold by Anarchy, Inc. is victimhood. It always boils down to the same formula: once the existing order can be painted as oppressors and children as their victims, chaos wins and order loses. Look at the lefties shrieking in unison about "Trump gassing children" today.
Funny there are those who think these migrant caravans were a FANTASTIC idea that's going to take the immigration issue away from you.
— Brian Cates (@drawandstrike) November 26, 2018
Like several weeks watching a rampaging horde storm the fences & throw rocks at our border patrol agents & getting gassed = great optics!
This media manipulation effort was inspired by the success of the "kids in cages" freakout, a 100% Stalinist propaganda drive that required people to forget about Obama putting migrant children in cells. It worked, so now they want pics of Trump "gassing children on the border."
There's a heavy air of Pallywood around the whole thing as well. If the Palestinians can stage huge theatrical performances of victimhood with the willing cooperation of Western media, why shouldn't the migrant caravan organizers expect the same?
It's business as usual for Anarchy, Inc. - the worldwide shredding of national sovereignty to increase the power of transnational organizations and left-wing ideology. Many in the media are true believers. Others just cannot resist the narrative of "change" and "social justice."
The product sold by Anarchy, Inc. is victimhood. It always boils down to the same formula: once the existing order can be painted as oppressors and children as their victims, chaos wins and order loses. Look at the lefties shrieking in unison about "Trump gassing children" today.
