#22 Class and Object Practical in Java

Check out our courses:
Spring and Microservices Weekend Live Batch : bit.ly/spring-live-weekend
Coupon: TELUSKO10 (10% Discount)
Master Java Spring Development : bit.ly/java-spring-cloud
Udemy Courses:
Java:- bit.ly/JavaUdemyTelusko
Spring:- bit.ly/SpringUdemyTelusko
Java For Programmers:- bit.ly/javaProgrammers
For More Queries WhatsApp or Call on : [phone]
website : courses.telusko.com/
In this lecture we will learn:
- Class in Java
- Syntax of class in Java
- Creation of objects in Java
- Methods in Java
#1
Whatever we do in Java, we do it in a class.
A class is a user-defined blueprint or prototype from which objects are created.
- In a class, we have methods and variables.
- Class will be created in the same java file.
- We can create any number of classes in a program.
- Class does not occupy memory.
Syntax of a class:-
class classname
{
methods, variables
}
#2
- Every object has two things: properties and methods.
- When an object of a class is created, the class is said to be instantiated. All the instances share the attributes and the behavior of the class.
- Action will be done with the help of methods.
- We need to specify the access to methods. We will specify it as public if we want it to be called from anywhere else.
- If we want the method to return any value then we need to specify its return type like int for Integer type values.
- As Java is a statically typed language so you have to specify the return type in it.
Syntax of method:-
= access modifier return type method name()
public int add()
{
statement;
}
#3
- We need an object to call a method from a different class.
- Creating an object:-
classname reference variable= new classname();
- reference variable is used to tell that this variable is made to establish a reference between a class.
- new keyword is used to tell that we have to utilise the space for an object.
- We can call a method by using the reference variable of the object.
- We have to pass the values if we want some operations to be on them.
- We also have to accept values in a method as well if we pass some values. For this, we have to specify parameters in a method based on the type of passed values.
Java:- bit.ly/JavaUdemyTelusko
Spring:- bit.ly/SpringUdemyTelusko
More Learning :
Java :- bit.ly/3x6rr0N
Python :- bit.ly/3GRc7JX
Django :- bit.ly/3MmoJK6
JavaScript :- bit.ly/3tiAlHo
Node JS :- bit.ly/3GT4liq
Rest Api :-bit.ly/3MjhZwt
Servlet :- bit.ly/3Q7eA7k
Spring Framework :- bit.ly/3xi7buh
Design Patterns in Java :- bit.ly/3MocXiq
Docker :- bit.ly/3xjWzLA
Blockchain Tutorial :- bit.ly/3NSbOkc
Corda Tutorial:- bit.ly/3thbUKa
Hyperledger Fabric :- bit.ly/38RZCRB
NoSQL Tutorial :- bit.ly/3aJpRuc
Mysql Tutorial :- bit.ly/3thpr4L
Data Structures using Java :- bit.ly/3MuJa7S
Git Tutorial :- bit.ly/3NXyCPu
Donation:
PayPal Id : navinreddy20
www.telusko.com

[@user-benjaminJohn]

Telusko, this video is brillant! NO ONE has been able to articulate this to me in such a clear way. I wish I had found this video YEARS ago. 🙏 Your channel is pure🔥!

[@032-m.muthuanushya2]

Hey vera level bro 🎉 i can understand concepts very well it's my third days of java coding journey ,i continuously watching your tutorial and i follow ur tutorial only🎉.thank you 🎉🎉

[@fezaiozcan2227]

absolutely best tutorials about Java! thanks:)

[@prasantdas587]

You are an amazing instructor. It’s not just how to write the code but why to do it certain way.. brilliant..

[@nareshgajula]

Good but difficult for the beginners to understand the depth of your explanation!

[@user-uq5yx4wl4u]

Congratulation you made java so easy in this short concept of object and class in java💯

[@akankshamishra1262]

Hi, Thanks a lot for excellent explanation, very understandable to beginners, I'm learning java for automation selenium with your video.💯

[@91-ritikjain36]

sir you are the best teacher sir plzz create a new series on jsp and servlet

[@mango-strawberry]

Literally perfect explanation

[@Trunk_Tech]

Am enjoying every bit of these lessons......Kudos

[@user-wg6ud3hh1n]

it was an excellent explanation. Very understandable to beginners.

[@chichhasquad2342]

Never been this much easy. Hatts off bro .

[@aishwaryab673]

Hey TELUSKO, this was my first comment on KZbin because I was such an introvert to even make a comment, The way you teach I admire a lot and this video is incredible and it paves me to think of exploring all your courses!!!! Thanks again Telusko !!

[@rohithvarma6763]

probably the best java teacher in the world

[@rahulmansarowar1430]

your all videos is excellent! i wish i had found this collection years ago.❤

[@yitingchen8278]

Good explanation!

[@shaikmansoor223]

00:05 In this video, we learned about classes and objects in Java. 01:57 Design your objects by separating manufacturing and designing 03:49 Methods in Java must specify access and return type 05:39 Designing a class with a variable and a method 07:35 To create an object, you need to specify the type and use the 'new' keyword. 09:40 How to create an object in Java 11:47 Create a variable called R and assign the sum of num1 and num2 to it 13:42 The video discusses how to create a class in Java and use it to add two values.

[@photolab6712]

superb lecture...

[@chinyamaraphael-sp6wt]

I don't know how I can express myself. We did objects with my lecturer but I did not understand what he was saying until I found this video. You are a redeemer. ❤

[@bandarisailikhitha9865]

Thanks navin, you are awesome

[@Shubham-fk4is]

It was easy in Python, but unable to understand in Java.

[@shandeshchaudhary-ps1tz]

you are the best man

[@chaitanyathorat8429]

Perfectooo👌👌

[@shobhashobha2614]

Hi sir Which language is best for preparing dsa?

[@agilan1546]

Why are we creating a variable int a in the calculator class?

[@RK_Universe]

can't find main(String[]) method in class-How to solve the issue.Pls comment sir.

[@abishekathangaselvam6673]

First time i am disappointed with ur series,actually u r confusing and still now not told about getting inputs very disappointed sie

[@pydisettymahesh9655]

it is an exaple of inheritance

[@nprince411]

tqs sir

[@hrishikeshmukherjee813]

Super

[@rsvcreations7450]

sir when i am trying this i am getting error that "can't find main method in calculator class"

[@pinkeykumari1312]

my java file created but class not loaded then what to do?

[@darshilchitranshi592]

14:21 summmary

[@gugulothusaritha1221]

sir,Increase the font size

[@nandasiddiksha5534]

how to get user input?? Instead of assigning values to variables..

[@__sam_danielW]

We have to import scanner so that we can get the input from the user

[@ourera2279]

does anyone know where are the pratice questions for these ?

[@tekkishort9018]

U need to redo this part all parts were clear and concise until this video it's very bad redo it

[@kanushagrawal7192]

why are we using diffrent classes for adding where it can be done easily in one class only??? why to complicate things??? and also did not understand anything rest all the videos were superb but i dont know why

[@_Deepak__Verma]

Instead of creating classes can't we make a complex function that works exactly the same way then why use class

[@timsy4401]

this video is not much clear

[@sonaligaikwad-zo5ds]

But in calculator class main method is not declare

[@arashgh7461]

Thanks for that. i have a project in java will you help me on that payable

[@The_Shrock69]

Bro😂

[@RamgiriRachaRayudu]

🥳

[@AnuragRawat01]

Thank u so much 💯❤️

[@rohitn6063]

14:37

[@manojm1853]

2:57 my iPhone says the same

[@kirubasathish3683]

sir we can add the number like this also sir? class Calculator{ int a; public int add() { System.out.println("add"); return 12 + 12; } } public class java1 { public static void main(String a[]) { Calculator calc = new Calculator(); int result = calc.add(); //int result = num1 + num2; System.out.println(result); } } and good explanation sir

[@kartheekk2380]

can you please explain 2nd line why we have to mention int a; please

[@hellohell143]

​​​​@@kartheekk2380bro we are not using a he just shows how to declaration a data type in class

[@malvikaambastasquestx5965]

Yes, this will work.

[@malvikaambastasquestx5965]

@@kartheekk2380We don’t need to put it. Not compulsory.

[@sheiduwgwjd]

Confusing

[@divakarpareek9466]

@telusko -- I must say your previous Java series of 6 hrs was much better then this one. I have come to 22nd video, in almost each video you are struggling to put clear example and changing in between that's frustating . It should be pre prepared.

[@abdulbasith3818]

Can you pls mention that vedio

[@abdulbasith3818]

For me it is little bit tuff

[@rutulkarbhari4963]

not working for me even if I have the same codes as you. Giving - error: can't find the main(String[]) method in class: Calculator. Solution?

[@naveenrajanaveen6462]

Put (String args[]) instead of (String []) You want to give a name like args, abc, etc..

[@rutulkarbhari4963]

@@naveenrajanaveen6462 was helpful. And i also wanted to thank you sir🙏.

[@miethrayan]

​@@naveenrajanaveen6462 but it shows error in main method

[@alex__coder]

define calculator class after the hello class, then it will work fine@@miethrayan

[@rockybalboa6969]

14:21 summmary