Stack and Heap: Memory Management In Java (The most important Concept in Java)
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- เผยแพร่เมื่อ 9 ก.ค. 2024
- From Java Code to Java Heap: Understanding the Memory Usage of Your Application:
Understanding JVM Memory Model, Java Memory Management are very important if you want to understand the working of Java Garbage Collection.
You might think that if you are programming in Java, what do you need to know about how memory works? Java has automatic memory management, a nice and quiet garbage collector that quietly works in the background to clean up the unused objects and free up some memory.
Therefore, you as a Java programmer do not need to bother yourself with problems like destroying objects, as they are not used anymore. However, even if this process is automatic in Java, it does not guarantee anything. By not knowing how the garbage collector and
Java memory is designed, you could have objects that are not eligible for garbage collecting, even if you are no longer using them.
So knowing how memory actually works in Java is important, as it gives you the advantage of writing high-performance and optimized applications that will never ever crash with an OutOfMemoryError.
On the other hand, when you find yourself in a bad situation, you will be able to quickly find the memory leak.
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شكرا للمشاهدة - วิทยาศาสตร์และเทคโนโลยี
The best video on memory management that I have come across. It gives a clear insight on how to write memory efficient code in Java.
Will appreciate if you can make a video on streaming and how it works internally.
Thanks a ton.
never found so detailed.... thanks a ton!
Thanks a lot Naveen. That was a Video which I was looking for it but never could find. Thanks for the excellent explanation.
Best illustrated concept of memory management in java
Just thank you.. i relieved finally.. i ve been seaching this for years !!!
This is perfect! Great job man ! Thanks a lot!
Great video. JVM understanding is important not only for interviews but far beyond interviews.
Sir you have clear all concepts regarding java memory management. Thanks for your such great efforts in making video.
This video deserves more likes and views 🙏
Awesome explanation!!! Terrific!! Thanks a lot!!!
Great explanation. Thank you!
really it is very nice video, after read this, I clear my concept on memory heap and stack. thank you navin.
Very good video....!! Crisp and Clear...!!! Thank you...!!
Great explanation. I read that from Java 8 onwards the permgen has been removed. And instead of permgen we have a metaspace which is part of the native memory (which is not a heap memory) which is managed by the OS.
Muchisimas graciasssssss, sigue subiendo mas videos de este tipo
Excellent! Thank you so much.
Thanks Naveen for this amazing video. It is full of information and explained very clearly.
Thanks much for sharing the information.
Thankyou Naveen. This was so informational
Great knowledge you having sir. Thanks for this .
This was really helpful. Thanks a lot.
I am always follow your channel for java related , you rocking pls keep doing the good work. great sir!❤
I Like your efforts Naveen, Very very useful video for interview (I was asked these questions in mine!).
My first nice video on Memory Management 👌👌
Thank you so much for creating such a helpful video
Thank you provide valuable information about Java memory management 🙏🙏🙏
Great Explanation , this is something that I found deepen understanding of memory management. Thanks Naveen
Thanks for sharing this knowledge!
Hi Naveen,
as always this is nice explanation!!
Can we say that :Java Stack memory=Class (method) area+Native Method Stack+Variables memory area
I really appreciate your effort Naveen. Thanks for video :)
Excellent sir, thanks for the video
Thankyou for this video Naveen!
It was really a very explanatory session.
Got all the concept by this vesio
Very good explanation for Memory management. Thanks Naveen
Best content on memory management..Thanks for sharing!
Thanks glad you liked it. Please refer the latest video on java memory management
Thanks, very interesting video. I just wanted to see what is the diference between local and static variable storage but I've learned much more.
Hats off sir..very good explanation..
Pls continue this topic to cover garbage collection..
Bow down to u ...TY so much
Great and deep explanation and information in detail . Better than all other videos from other youtube channels.. Just a small suggestion, if the diagram is ready then this video can be covered in bit less time.Awesome video. Thanks a ton
u really make it simple naveen... 😊...i still like ur amazing diagrammatic representation of concepts which make things really easy to understand...kudos bro... keep going...👏🙂
one word....AWESOME
Great video. Just had a couple of query : 1. You said permgen is part of stack memory but you displayed them on separate boxes so that was confusing.
2. You said stack size is very less compared to heap memory. but than what about Permgen (or now Metaspace) . Is metaspace is less compared to heap?
Thanks!
Very Good One:) got some more Idea about JRE.
Thankyou sir for this 🔥🔥🔥 explanation
great information, fine details. :)
Its really helpfull..thank you
Every Nice explanation sir, it's very clear to understand. Thank you sir.
awesome man
Thank you so much Naveen but one Question, Cam you tell from which book you took reference ?
Thanks bro great job. thank u
Very nice👍👍👍 it's really helpful.
Such a quality content ❤️
Thank you.
Great explanation
great explanation 👏
Great explanation..
Great one!! One question to you Naveen. Do you know how to perform test for the product (Web based Game) where DOM element is hidden. I think all the DOM element is under the CANVAS?
Nice Explanation
Clearly explained ....
Good explanation
sir , your explanation is very nice
and make more videos
thanking you very much sir
Thanks a lot.
One of the survivor memories will always be free..
Custom immutable store into which part of memory?
Great Work, I searched so many videos but this is my final stop !!
Appreciate the efforts you did to make this :)
One doubt : Is permanent generation the part of Stack Memory ???
Kutha chimpi para dhengaw anna.... Mid nyt kuda chaala interesting ga chusaa
Thank you sir 🔥🔥
If Test t = new Test() is defined as instance variable rather then defined inside some method like m1 method. In that case I understood that new test() will be creating one object inside the heap. But where the reference will be stored as it is not local variable it is instance variable ? And stack will store local variable and local references as much as i know?
Nice explanation, thank you...As for the back ground noise, you could add a faint background music to cancel and soften the high pitch noise....
Very well explained .. Concise and clear .. Pls keep uploading more videos on JAVA
One of the best tutors you are Naveen.
thanks for watching it @Rachana
Nice explanation sir..
how you differing method block and method area of Permanent generation.
Ty. Good explanation
Glad it was helpful!
which method block is stored in stack in case of method overriding?
Awesome
Thanks boss
Thanks Naveen . I have a question is premgen is also part of stack memory
very very nice explain
I become subscriber because this video
Naveen ji extraordinary teaching thanks a lot for sharing your great knowledge please help in sql concepts as well.
Thanks Sir
very very nice....
Hello Sir, I have some questions:
So where exactly are new Strings stored (in heap or in stringpool directly)? And where is the stringpool located then (method area of permgen or heap)? There has been some changes in Java 7 and 8 to the permgen section. When does a string automatically move to striingpool provided intern methos is not called.
Thanks in advance :)
Memory leak will come on only in heap area right? If yes then in that case what we need to do in that case?
Hi Naveen,
My Java application reads file and stores to DB.for this it takes 3GB space.but after completion of program GC is not clearing the space, application still takes 3GB space.how to free up the space??
If m1 calls m2, method block will be available to which method?
Hi Naveen, just want to know each application create own JRE on server memory? also what is difference between JVM and JMM?
Awesome video. I have one question do i need to run manual gc?
Very good
Thanks for such nice videos....can you please tell me after execution of a method... where the result is stored.???
very nice video. one question i had, corresponding to each thread is there a separate stack bcoz in case of multiple threads multiple functions may execute simultaneously thus each method need a method block. Though in a particular thread only one method will execute at a time.
Hi Naveen, one query on method block. You said one method at a time is given space inside it. But let's say we have a main method which calls another method inside it. How is this scenario handled?
if Method block is used one by one by the methods being executed, what will happen if one method1 calls another method2 and method2 returns something to method1, at this time both the methods are executing (pseudo parallelly)?
Very informative. I have one doubt why the survivor memory classified as two, both have same usage and purpose?
sir can we say that each class have only one object and rest are created by referenced to that object.
What are JRE classes? The predefined classes or the ones which I have made ?? Someone help me understand please.
As per my understanding,
1. So at a time, one of the survivor space is always empty ? this correct ?
2. Objects that are survived after many cycles of GC, are moved to the Old generation memory space ?
As much as i have a knowledge till now permanent generation is separate memory are and stack is separate memory area . But in this video somewhere at the end you are saying parmanent memory is part of stack memory which is making me confused can you please explain on that ? Is both separate memory area or parmanent is part of stack. ?
Question 1:
At the time of Major GC, will the JRE do only Major GC ? or JRE will perform its normal tasks and in parallel Major GC will perform
Question 2:
When you said we don't have to do the Major GC frequently, is there any code we write explicitly for GC? I think JRE itself take care of the Garbage collection.
Thanks Naveen for such a informative video. I have a follow up question below:-
If we create any Collection I.e Arraylist , Hashmap etc .. where is it created .. in Heap or Stack?Since collections stores the the object references rather than physical objects..How does it manage the whole process?