#26 Stack And Heap in Java

Рет қаралды 212,143

Жыл бұрын

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In this lecture we are discussing:
1) Memory management in java and typed of categories to store data in memory.
2)What is stack ?
3)What is heap ?
4) where instance variable and local variable is allocated?
#1
In java we are managing our managing our memory using two data structure stack and heap.
two categories to store data in memory:
1) Stack data structure
2) heap data structure
#2
Stack is data structure which follow LIFO(Last in First Out) principle.
#3
heap is data structure which is used to store data in form of object and object is a collection of data and method.
#4
class Student{
int instVariable; //store in object and object created in heap
public static void main(String []args){
int localVariable=0; //local variable store in stack frame of method in stack area.
Student st=new Student(); //st is reference variable store address of new Student() object
}
public int add(int num1,int num2){
return num1+num2;
}
}
-- instance variable stored in object and object are in heap therefore we can say that instance variable created in heap.
-- method declaration and definition is present in object but actual implementation present in stack frame of stack.
-- local variable created in stack during call of method.
-- stack frame of called method is present in stack area.
-- st is reference variable created inside the current stack frame and it is reference variable store address of student object created in heap area.
-- new Student() create object in heap area and pointed by his reference variable.
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Пікірлер: 80

@spidermanhomecoming001 Жыл бұрын

I just love you sir! I was confused for so long about heap and stack. Now its clear! U are a great teacher.

@piotr2951 2 ай бұрын

No, we don't have multiple stacks (in a single thread), those are called frames. Those frames contain multiple data structures for storing local variables, operands, return addresses, constants.

@ajiboladaniel9386 8 ай бұрын

The best Java teacher I've ever encountered in my life. You are awesome sir. The understanding of the concept is sooo seamless. It's like a miracle. Thanks soo much.

@MsSWAGboss Жыл бұрын

Thank you for the video :) I just started going into interviews again and this helped me get back to speed on the topic cause I had forgotten so much stuff throughout the year as a junior dev

@thefriendlymartian7317 5 ай бұрын

The best explanation anyone could ever give. As soon as I have a question in my mind, you call out that point and explain as if I asked the question in person. Just shows how perfectly the flow of the content is.

@ferzandali1527 3 ай бұрын

I agree with u 100%

@rushikeshbhujbal2480 Жыл бұрын

you are really great,this content is really helpfull and thanks for the notes that you are providing in description.

@zr0724 Жыл бұрын

wow , these tutorials are of next level for sure. thank you sir.

@chairma_prabhu 9 ай бұрын

Thank you Navin for providing quality content like this.

@mehedishuvo6257 3 ай бұрын

Well explained dear sir.Not only India but also all over the world students get benefited by your lecture,. This is a masterpiece that ever created by you.💜💜💜💜💜,,,,Love from Bangladesh dear sir.

@ramenmanna6150 Жыл бұрын

Great video sir 😊 understand concepts very well ! love you sir 🥳

@Shubham-si6hd Жыл бұрын

You are a life saver! Thank You

@danurarya0823 Жыл бұрын

Thanks for this sir, i like when you are describing how things work using a sketch. maybe it's just me but reading documentation that just only have text explanation is really confusing and to imagining it was really hard.

@omkaromkar5215 10 ай бұрын

Same

@prakash1to7 Жыл бұрын

Great way of delivery Sir. Really motivating to learn. Keep on Rocking Sir :-)

@MohdZaid-kv7yn 10 ай бұрын

Watching 2 hours before java developer interview

@moaazsuliman7584 Жыл бұрын

From Egypt Thank You Very Much

@Coding-Just Жыл бұрын

Navin sir it's totally clear thanks a lot and sir i have to join your Java backend course but Saturday is my college sir and it's 3rd year bca 7 to 12 time is not convenient sir

@bharathsajan8926 2 ай бұрын

wonderfully explained thank you.

@alexkuzmichev9051 Жыл бұрын

nicely explained! by the way, what program do you use to draw?

@sahinyusifli9756 Жыл бұрын

Thank you, it was so educative to me

@kapiljain359 9 ай бұрын

Really Nice explained. I am following Telusko since my collage time(2018). And now I am the Senior Software Developer in reputated Product company. Big Thanks Goes to Mr Naveen. Thank you Sir! I would like to request if you can make the playlist on AWS for Java Developers. It would be very helpful.

@princeiiolaguera921 6 ай бұрын

Best course imo. Can you please create exercises so we can test our knowledge and skills so far? Thank you

@bahasahli4151 5 ай бұрын

Simply awesome thank you 🌼

@rajnishchoubey2246 10 ай бұрын

Sir with reference to memory allocation in java can u plzz specify which of the variables have static memory allocation and which one has dynamic allocation and why

@srushtishah8674 5 ай бұрын

When i asked my sir about instance variable he gave me such lame ans that I gave up on every being able to understanding it. Thanks!!

@hridikasaha9519 11 ай бұрын

Excellent explanation

@vishnusunil7446 Жыл бұрын

Amazing video.. thank you.

@HocineFerradj 7 күн бұрын

U are a great teacher

@srinivasmb-re8km Жыл бұрын

Where static variables are stored? static int in = 10;

@sn0wball13 6 ай бұрын

Thank you so much for this explanation!!!! :)

@rosaliademartino7265 Жыл бұрын

nice and clear, thanks!

@jackfrost8969 Жыл бұрын

excellent video. Keep it up.

@uchihasenpai5671 Жыл бұрын

Shouldn't obj be created after DATA in the stack? I mean should not OBJ be above data?

@valoranthighlights6374 Ай бұрын

great explanation . love it

@marcos_silvestri Жыл бұрын

Splendid!

@nasamind 7 ай бұрын

Simply awesome

@-RimuruTempest Жыл бұрын

Hi, I have one doubt. What about the add method in stack? If we create two objects then the is there two add stack?

@unemployedcse3514 2 ай бұрын

this channel gives trustworthy content where other's just do for content sake

@shyamchowdary5086 7 ай бұрын

I have a doubt. When we write a local variable in Java. It automatically allocates memory or it allocates after compilation? Please someone address this.

@adora6860 6 ай бұрын

maraming salamat tol

@FEJAYACHANDRANK Жыл бұрын

I have one doubt what if the class is static ... we cant create instance right at the case how is memory allocated

@anupam6045 Ай бұрын

best explanation sirr

@user-ql5pe3xc3p 5 ай бұрын

I became a diehard fan for you sir ❤ love you and love your teachings sir

@user-ql5pe3xc3p 5 ай бұрын

Thank You SIR ✨ This is my status today 🫴 ✨ Thank You SIR 💫

@HarshPatel-so7gl 6 ай бұрын

incredible

@afsirlaghari3738 Жыл бұрын

Love you Naveen sir, from Pakistan.

@Avineshutube Ай бұрын

excellent !!

@actandrepeat Жыл бұрын

Wow!

@saumyojitdas4212 9 ай бұрын

public class Main { String s = "ABC"; public static void main(String[] args) { Main obj = new Main() ; System.out.println(obj.s); } } in this above code String object is created in heap and also of class. So 2 objects in heap. But isn't the string object Abc resides inside class object in the heap?that's why we are calling it obj.s

@ganesang7217 5 ай бұрын

I understand clearly, it's not an object. It's a reference type.like Car c = new Car() c is reference type, correct or not

@YuvarajRoll 8 ай бұрын

Sir how to get input from users in java

@aaaeditzforever 8 ай бұрын

Super

@abhiroy1993 Жыл бұрын

Will the 'add' method stack be reused for the 2 different objects or will it create a new 'add' method stack for obj1?

@Krishna_script 10 ай бұрын

the new obj1 will reuse the add method which is there in the stack

@saumyojitdas4212 9 ай бұрын

@@Krishna_scriptpublic class Main { String s = "ABC"; public static void main(String[] args) { Main obj = new Main() ; System.out.println(obj.s); } } in this above code String object is created in heap and also of class. So 2 objects in heap. But isn't the string object Abc resides inside class object in the heap?that's why we are calling it obj.s

@abhishekmb7690 Жыл бұрын

Where the memory will be allocated for static members and static methods sir

@HimakumarTellaboina Жыл бұрын

Stack Area

@ashutoshraj8668 9 ай бұрын

But sir methods of objects are stored in method area😢

@papo7936 10 ай бұрын

Could you replicate this video for python too?

@ummersiddique 13 күн бұрын

Which device is he using for drawing?

@Ounknown098 Жыл бұрын

i am comming from pw skills to watch full memory alliocaion

@keinsent 3 ай бұрын

tqsmomg

@partoon863 11 ай бұрын

If you guide us in Hindi we understand it more clearly

@congdatt 4 ай бұрын

Stack: - Store local variables - Address of obj ( obj store in HEAP ) Heap: - Store obj. Have 2 sections: instance variables & .... (add(),....) Every method have own stack

@rajattalreja9740 Жыл бұрын

One question - Exactly when is a stack created? When the method is created of when the method is called?

@sachinkhatri1077 Жыл бұрын

I think stack memory allocated at run time. So it created when mehod is called. Thats why we get stackoverflow error at runtime instead of compile time.

@banujan.b2479 5 ай бұрын

To be more specific the entire program has a stack. But when you call a method, each method creates a stack-frame in the stack.

@mohokhachai 10 ай бұрын

Thier values is null

@mohokhachai 10 ай бұрын

Thier only one main entry function

@mohokhachai 10 ай бұрын

Scope

@RamSingh-bi9tc Ай бұрын

But damaging one phone affect the user heart

@jatinsharma3792 10 ай бұрын

You beauty !!

@banujan.b2479 5 ай бұрын

Each method has own stack or stack-frame? 🙄

@mohokhachai 10 ай бұрын

Entry point

@ehteerk 11 ай бұрын

An instance variable is a variable that is specific to a certain object. It is declared within the curly braces of the class but outside of any method. The value of an instance variable can be changed by any method in the class, but it is not accessible from outside the class

@muthukumarthangapandian8434 Жыл бұрын

both objects having same address only. if car1 =car2 class Car { String name; int cost; double mileage; } public class PassByReference { public static void main(String arg[]) { Car car1 =new Car(); System.out.println(car1.name); System.out.println(car1.cost); System.out.println(car1.mileage); car1.name="bmw"; car1.cost=1_00_0000; car1.mileage=17.5; System.out.println(car1.name); System.out.println(car1.cost); System.out.println(car1.mileage); Car car2=car1; System.out.println(car2.name); System.out.println(car2.cost); System.out.println(car2.mileage); car2.name="honda"; car2.cost=1_00_000; car2.mileage=18.5; System.out.println(car2.name); System.out.println(car2.cost); System.out.println(car2.mileage); System.out.println(car1.name); System.out.println(car1.cost); System.out.println(car1.mileage); System.out.println( car1.hashCode()); System.out.println( car2.hashCode()); System.out.println(car1); System.out.println(car2); } }