What is Singleton Class in Java | Singleton Design Pattern Part 1

[@misubgify]

thanks for clarifying singleton class. you are a genius. Respect!!! nobody explained it like you did here

[@gauravnagar3712]

+ Misu ZAMAN true totally agree with you

[@LabDutta]

agree with u

[@shaistakhalid7761]

Firstly, it was hard for me to understand the concept of Singleton pattern even after watching 4-5 videos, but your one video was more clear and was able to understand within few minutes. Thanks for the good stuff!

[@rjlifeandtech8675]

Nice explanation. Here I found that, Inside Abc class, "static Abc obj = new Abc();" is defaulted to a public statement, so, inside the main method, java will allow accessing directly static obj object. eg. "Abc obj1 = Abc.obj;", so getInstance() method is never needed to use. To fix this, we can mention like "private static Abc obj = new Abc();" and getInstance() method can be used now.

[@gouthamrajesh2745]

Thanks 😇

[@khalidben9940]

It would so good if you gave it with a real life example.Syntax is easy to learn but the implementation in programming daily life problems is so important here. But the video and the explanation is amazing.

[@jordirex7711]

for example a class for the connection to the database

[@gandamraviteja7019]

That;s the reason i love navin reddy tutorials he will just make viewers master in the concept what he is teaching Great man u are really great ALIEN..

[@drunkmadala]

Thanks, I wish I came straight to this post before searching around; you made this concept very easy to understand.

[@luyandantabeni2513]

this is the most simple explanation of a singleton design pattern i ever came across, thanks a lot

[@shubhamchopra5518]

I have completed the playlist, and this is the best explanation i have seen on singleton design pattern! Thanks a lot Naveen

[@jonuriah5274]

A trick: watch series on Flixzone. I've been using them for watching lots of of movies lately.

[@merricklawrence6793]

@Jon Uriah yea, have been using flixzone for months myself =)

[@eihodge]

Thanks man! I have to make one of these for a project I'm working on. This is exactly what I needed to see.

[@buildappswithevan]

Great video. Short and to the point. Good explanations.

[@youyoudada2250]

Concise, straight to the point. Thanks for sharing your knowledge

[@nitinsinging3204]

Well done mate, amazingly you have explained this in just 5 mins for which I was seeing more than 20 mins videos. Good job 👍

[@TheRaj78raj]

simple and easy explanation...thank you so much sir for clearing my concept.

[@dayanandswami8109]

Very nice explanation sir. Keep making this type of valuable video always. Thanks a lot

[@aparnaraj3342]

Best explanation have ever found... thank you:)

[@priyeshbhagat1004]

Happy Teachers Day Sir. Learnt a lot from your videos. Thank you for sharing knowledge :)

[@derryyeh]

Thanks. This is amazing explanation. Easy to understand!

[@richardwilkins5241]

Great explanation

[@abvy25]

Concise as always!

[@VirajMavani]

I agree with some of the comments here. The explanation is really good but an example would have helped a lot. One example for Singleton use is simply Database connections. You don't want more than one instance throughout the application.

[@dollytiwari9707]

you are amazing sir.

[@jithinmv6516]

That was a perfect explanation. Thank you❤️

[@ankush9386]

Thank you. Guys please like and share his videos. He really works hard. Thank you sir thank you so much.

[@samartajshaikh2601]

Thanks for explaining this topic so simply.

[@shaileshrkumar6813]

great video

[@rajatvarshney2721]

clear cut to the point explanation

[@AshutoshKumar-kq9vh]

Thanks! The explanation was precise and easy to understand.

[@bobybrahmam8653]

We can also remove the getInstace method and can directly call the object by writing (Abc obj1 = Abc.obj) in main method

[@chathuramahasen]

Thanks, sir. This really helps to get a proper understanding of the basics!

[@danielendless]

Best explanation of this. Saved me a whole lot of trouble and inefficient alternatives

[@harshverm776]

*Thanks for the playlist !!!*

[@saifsms91]

Nice Explanation of Singleton :)

[@ayushbagwari3496]

You make everything easy.Thanks keep it up

[@_HarshitSharma]

Simple and Amazing explanation!

[@SasiKumarsachin12]

very nice tutorial...i can easily understand with your explanation...thanks lot..now am prepare for interview this is very useful for me...thanks once again

[@krishnakumarramachandran5888]

Thanks for the clear Explanation of Singleton.

[@poshettiakhil2664]

Awesome explaination of single ton pattern

[@MUSTAFA2571992]

Thank you, your explanation is very easy to get

[@onerifat]

nice and clear explanation

[@nisithmondal7026]

best explanation about Singleton Class

[@Jolopy8000]

Top tier video on singleton right here! Awesome job

[@DineshKumar-tn7pu]

I have a question. We could have called the static variable in the other class main method, would have acted the same way as it is a static variable itself. Why we need a static method and call the static variable through the method?

[@amranhossain7099]

You are a genius , Why don't you make tutorial on every design pattern???????????

[@satya121prakash]

Today I was asked this question in Java Back End Developer interview for Qualitest.

[@ghanshyamb]

You are great style to explain problem scenario. On sidenote, let's keep class variable private.

[@codethrusharing8955]

excellent tutorial, thank you so much, easy to understand!

[@janta42]

Thanks Naveen! for making java interesting

[@mrwhite4137]

So clear Thank you

[@utilbook7881]

very good explanation. way to go Telusko

[@MuazAtik]

Amazing 🙏🙏🙏

[@aratibugade5845]

Very nice explination...easy and simple...

[@mannmerwana476]

I awe you respect Sir,Can't thank you enough.🙏🏻 I never understood why do we use a private constructor in a singleton class ,when jvm has automatically a default public constructor defined. Got the answer,: To make it private and not allow clients to make objs with default constructor which is public by default,i.e to simple restrict the user from creating instance of the class . Greatful to you.🙏🏻🫡🙏🏻❣️💯

[@johnyhawkahsan]

Great explanation! Thank you so much.

[@iamsubhadas]

Excellent tutorial. Thank you, sir.

[@mariusailisoaie183]

Great tutorial! Thank you for your help. I have a question: if we print the hash code of the obj1 and obj2 we get the same code twice. Why is that ? Should it not be only one hash code?

[@bablugope2705]

if you are getting different hashCode means your class is not singleton class.

[@natalievajdova]

Thanks, now I understand what Singleton is :-))

[@tseponkalai6528]

wow, only 4 minutes to explain something i have dreaded for the past year!

[@priyaj5283]

Thankyou for thIs beautiful explanation.. could you also includes the implementation of such concepts in a project

[@LifeIsGood1992]

clear and concise !! thanks you

[@samomamour8531]

Thank you a lot 💫

[@kostarev2000]

The best explanation, thank you.

[@abdifatahmohamed8600]

Thanks... that was straight forward!

[@speedbumphu]

Great explanation of the implementation.

[@sarathbaiju6040]

i have a doubt, every time calling the getInstance() there is new instance of Abc class will create, so then how this approach follows singleton design pattern?

[@vamsik3693]

in terms of automation can we implement singleton for creating driver instance where single driver instance can be used through out automation ?

[@channelname8300]

ossssam clarifying man

[@gajendraambewadkar7781]

Nice, Thanks

[@souravsantra4731]

thnx man.. Net & clean explanation .

[@igorbarros3308]

congratulations!! great video

[@vareshtuli]

It is showing an error on class object "The field obj cannot be declared static in a non-static inner type, unless initialized with a constant expression" so make the class also static. Please let me know why it is so?

[@ChrisSch258]

damn, thank you! short explanation and easy to understand now :)

[@oguzaktas7277]

Thanks good explanation.

[@thisismm1907]

why cant we use Abc.obj instead of Abc.getInstance()..? why should we create the getInstance() method? we can directly write : Abc obj1= Abc.obj; in main method.. please reply sir

[@DineshKumar-tn7pu]

That was my question too. It would have done the same thing.

[@jayanthv5867]

yeah.. same doubt.. may be he could have declared it as private static obj

[@TarekFaham]

And, if the singleton needs to call a web service to fetch some values, where do you place the code? Do you place it inside the singleton class or outside?

[@shashgo]

navin, I am writing a web service using rest. How do I use the singleton pattern to create a list that will keep getting updated with new elements with every @POST? The problem is that if I use a regular constructor, then whenever the rest service calls that class using a @POST , a new instance of that class is created with the same elements as before, and so the new element added by the previous @POST request to that class does not persist. Now obviously, I can overcome this limitation by updating the date into a table, but is there a way to do this without using a table?

[@ousamaelidrissi5886]

Thank you very much

[@asishsahu8186]

i think this singleton class is not working in multi threaded environment and we the static variable is always loads at the time of loading the class so the object is stored in jvm memory if we dont use also the jvm memory will be waste

[@NXNAWAFXN]

Thanks brother

[@dannyyu4227]

thank! so simple

[@arifahmed7855]

Boss of JAVA

[@prithiviraj6797]

Thanks bro..

[@tsp57]

Thank you

[@ramkumaradimulam3430]

Is it not the otherway? Meaning, since obj needs to be static (so that its shared among all Abc instances), the getter getInstance() needs to be static.

[@thellaidhinesh8929]

what is the use of the singleton class in Java sir? and at what situation we use singleton ?

[@raghuakuthota4900]

how about clone then, I can clon the existing object and I can create another object as well right?

[@k0lbis]

thanks this helped so much!

[@stefanelse]

Awesome, tnx bro,

[@manindersingh6371]

Just adding some information here because I was facing the issue. We can create as many as instances inside the class because in the class we can access private constructor but we can't access it from outside the class.

[@response2u]

Perfect! TNX

[@joejones5746]

Thanks buddy

[@youssh4975]

Would it make sense to declare such a class as abstract?

[@natangurfinkel]

Thanks.

[@sankarachelliah2872]

Hey! Is possible to pass arguments in singleton

[@NileshKumar-mk2ze]

Hello Sir, I have one question If Two threads are accessing the Singleton class object at a same time then what will happen or what problem will come and how we resolve such problem.

[@piyush96arora]

To solve your concern you could use synchronized keyword

[@sagarghare9829]

Thanks sir!!

[@inoxide5454]

Student: Are you Reddy? Navin: Yes i am.

[@kleavenae]

My way: public final class Singleton { public static final Singleton SINGLETON = new Singleton(); private Singleton() {} } usage: import static Singelton.SINGLETON; SINGLETON.method(); Is there any problem with that?

[@nanashipersonne4151]

I know how to make it now, but in what situations is this useful?

[@manickam7231]

Bro y cant we use static class abc Insted of declaring an static abc object

[@swapnilsrivastav3477]

If I use Reflection API then I can call private constructor ... So I wanted to ask if I am using Reflection API it means I can't implement concept of singleton ???