#40 Encapsulation in Java

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In this lecture we are discussing:
1)What is encapsulation?
2)how to achieve encapsulation
3)Benefits of encapsulation
4)how to use private data?
#1
What is encapsulation?
= binding data with method to make your program secure is known as encapsulation.
Consider encapsulation as we have capsule and inside capsule everything inside a class is wrapped or encapsulated.
e.g
class A{ private int a;
public void setA(int num){a=num;}
public int getA(){return a;}
}
//here you can see that we can bind data with method inside a curly braces, it seems look like a capsule inside everything is present.
#2
how to achieve encapsulation?
-- through access specifiers private,protected,public,default . We can achieve
encapsulation.
#3
Benefit of encapsulation
i)Helpful in to achieve abstraction
ii)for security point of view it is most beneficial.
iii)you can maintain log file through method when you bind your data with method.
#4
how to use private data?
-- using setters and getters method we can set and get the value of variable.
-- private int num;
public int getNum( )
{
return num;
}
public void setNum(int num)
{
this.num=num;
}
Note:
Always make variable as private and method as public to achieve security in program.
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[@user-so8bb4bt3u]

00:04 Encapsulation is a part of object oriented programming. 01:33 Data is stored in the brain in the format of variables 02:57 Data access control in object-oriented programming 04:22 Private variables can only be accessed within the same class. 05:56 Data access is restricted using methods. 07:16 Private variables can only be accessed within the class that they are defined in. 08:51 Setting values for variables and accessing them using methods. 10:22 Encapsulation is a way to bind data and methods together

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the way you explain this is magical. I went through videos to find out what encapsulation is and from you i found it. Highly Appreciated Man!

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[@LearnEnglishMM]

You are using examples from personal life; it’s good to let others learn things well. Try to give a minimum of two examples in each video per topic. Thanks.

[@ghunsenh]

Nice explanation of getters and setters

[@aishwaryasinnur2256]

really easy to understand sir 😍😍thanku

[@vinodonweb]

amazing teacshing method 👍👍

[@SB-pk2ss]

you don't need to use a static block if you just want to initialze a field private static String name = "Phone"; would be enough. but if you need some complex manipulations, requires several lines of code, than yes, there static blocks come in

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[@iam_robinroy]

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[@it.b.61.prashantsingh87]

Explanantion was top notch! But my question is we use private access modifier so that other classes can't use it, and then we create get and set method through which we can change and access the value, if we are including get and set method for private variable, why we simply can't keep the vaiable public if in the end we need to access and change the data.

[@navasshariff.s9426]

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[@chemistryworl]

U r lit sir 🔥

[@adityapatil7396]

Can we achieve encapsulation by declaring variables protected instead of private ?

[@vigneshrp1294]

I have a doubt from a long time and couldnt find the answer.......We use access modifiers to control the accessiblity within the program to ensure encapsulation.....so if we have a private variable and if still we can access it through a public getter method then what is the use of having a private variable.....it can be public instead right?

[@user-xc5tg3zi4e]

@Telusko I have a question sir, We can even call the getAge() method by simply passing the value and calling it under Demo class, even age is private in class Human. I tried it and worked well, which states that we don't need setAge() method to set the value, can simply pass through the getAge() and fetch the value. Please explain sir, how I am wrong and why do we need get, set methods here? I am pretty sure there must be point behind there :) For eg: public int getAge(int a) { age = a; return a; } And while calling it under class demo, we can define: Human obj = new Human(); int final = obj.getAge(56); System.out.println(final);

[@Tolly633]

If u try to just age()method passing the value under demo class from calling function age method to called function age() without get method. If u can declare variables as private u can't access variables without set or get methods. But u did declare variables as private at the same time u used get /set method. That's the reason u got an output(u haven't no error)

[@manikandans1996]

Sir pls provide notes for this playlist

[@muhammedashkar692]

breaks my head and takes his name and says "oh there is his name"🤣🤣

[@luckygold777]

Sir, can u please tell me what is the point if we can access the data and change the data even if it's private? what is the advantage of the variable not being accessed directly.....Please respond as soon as possible sir.

[@a.m.e.e.e.r]

As you heard he said only via methods, so if you don't make "setName" method for example, no one can change the data, while they can GET the data via "getName" it depends on the methods you create. and yeah everyone can touch it if they have your pc, but it's different when it's on the app/game/web you make. Hope it helped. 😊

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[@prudvidiyya9226]

❤

[@jatinsharma3792]

Yes, but is it important to make the class in such a way that we should asign the private vable value directly withou using the setter method.? Why we need to create the strcuture to set the data only and to fetch the data ? I mean what is the actual real life purpose of doin this activity which you are saying Encapsulation ?

[@broyea6943]

I just learned about encapsulation right now😂, does this mean I should stop using constructors and use setters instead?

[@vinaysaiakula9475]

Sir what if we keep method as private 🤔

[@NirajKumar-ip1gq]

obj.setAge(a: 30); I didn't understood this

[@rdxdevil5083]

very good sir i got it but encapsulation means only public method can access it encapsulation means data hiding but we are going to public the data can someone clear mt doubt....

[@neerajgarg9096]

we are not going to public data member instead we are going to public the member functions which help to get and set the value of our private data member see the below code class Encapsulation{ private int x; // now this data member is hidden from outside world as it is private but to set its value and get its value we need to define functions which are public and can be used public void set(int a){ x=a; } public int get(){ return x; } }

[@reshmashetty1471]

"break my head and say... Hey! I got the data" 🤣🤣🤣🤣

[@puruagni1927]

Why are you not updating VS Code? Please update VS Code.

[@ganeshkumarv3895]

why there isn't this.age = age or return this.age ?

[@aeroabrar_31]

Yes you can, but the variable name which is coming as a parameter should be 'age' .

[@ArpithaHK]

The parameter which is passing to setter method is same as the instance variable, then "this" must be used. for ex: public void setAge(String age); { this.age = age; }

[@sachinkhatri1077]

U can use that if u set your methods parameters name exactly like instance variables. By the way thats a good practice to use proper name in methods and use this keyword to refer.

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adam scandler's pixel

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[@princet0429]

mm

[@Realfactsofficial-mz4tz]

sir your video good but it is too lenthy and long

[@kvelez]

public class Main{ public static void main(String[] args) { Human me = new Human(30, "Mario"); System.out.println(me.GetName() + " " + me.GetAge()); } } class Human{ private int age;//private attribute private String name; public Human(int age, String name){//constructor this.age = age;//setting this.name = name; } public void SetAge(int age){//set value this.age = age; } public int GetAge(){//output return age; } public void SetName(String name){//setter this.name = name; } public String GetName(){//getter return name; } }

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[@adithidesai8690]

6:28 Jeffrey Dahmer's way of accessing the data

[@authenticworld7271]

And your age is 41

[@thebacheafghan]

you cannot define someone's age. you are ageist. you are cancelled.

[@dummyaxle2099]

You use too many words, cut it by 1/3