How to BREAK and FIX Singleton Design Pattern | Interview Question

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The singleton pattern is implemented by creating a class with a method that creates a new class instance if one does not exist. An instance already exists simply returns a reference to that object.
To ensure that the object cannot be instantiated any other way, the constructor is made private.
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#singleton #softwaredesign #java #DailyCodeBuffer

[@thedarkhorseevil2635]

Bhai faad .....abhi tk sbse best video ..no bakwas no makhan malayi.. only main content in basic and easy language

[@neon0wl2107]

Thank you for listening to our suggestions and starting with design pattern. I hope this is a series and you cover some more patters, well the most common ones at least.

[@DailyCodeBuffer]

Thanks 🙏
Planning for it

[@akhiljuluru927]

please make all design patterns videos. Thank you for all your videos

[@DailyCodeBuffer]

Thanks 🙏
Yes, that is the plan

[@mihirshinde4268]

Best part of your videos is: Complete Information in short time. Keep it up!

[@sanskaragarwal582]

Shandar bhai! Maza aagya. Keep posting such content!

[@oshogarg5215]

in depth explaination , hats-off

[@shivaanandadari6533]

Great Content brother! Appreciate it!

[@roopkishore785]

The question was asked in MakeMyTrip Interview. about the multiple threads waiting time, you explained the synchronized Block.
I was not able to answer that scenario, But now I got it.
Thanks for the proper explanation.

[@TechieTaught]

Great, the enum one is something I came to know after long time.

[@hardworkerbig]

U explain the singleton dp well..thanks

[@vineettalashi]

Thanks for sharing knowledge. Respect to you brother.

[@Anilkumar-reddy]

Nice Explanation bro, ur the life saver

[@DailyCodeBuffer]

Thanks 🙏🏻

[@mathcss8496]

Wow nice one Shabbir 🔥🔥

[@unknownxengineer]

Very straightforward..

[@DailyCodeBuffer]

Thanks 🙏

[@DeepakGupta-pz4fx]

Thank you Bro for this series start ...please complete alll topic of design patterns....Happy Diwali

[@DailyCodeBuffer]

Thanks 🙏
Yes working on it
Happy Diwali

[@rock_0075]

Thanks for the video, quick question how can you have the instance of a class on line 13 in the same class define?

[@Telugu_europe]

Very good explanation 😊

[@DailyCodeBuffer]

🙏🏻

[@AdityaRaj-ix5rg]

Thanks for the awesome video on design patterns. Kindly make video course of apache kafka as well.

[@DailyCodeBuffer]

Thanks 🙏🏻
Planning on it

[@ipsadas4233]

Great video😊

[@DailyCodeBuffer]

Glad you enjoyed

[@adityarathor5300]

Hi bro, Great explain Can you also define program via enum as solution against reflection.

[@rachits21792]

Need one video on builder design pattern and where to use them. Please keep making informative videos.

[@DailyCodeBuffer]

Working on it

[@nikantchaudhary]

Design Patterns is a very complicated topic. Very good tutorials are not there on TH-cam. I hope you start the design patterns series.

[@DailyCodeBuffer]

Yes, working on it

[@nikhileshyoutube4924]

Excellent bro happy diwali

[@DailyCodeBuffer]

Thanks 🙏
Happy Diwali

[@MrMikomi]

Should have said though, great video, thanks.

[@DailyCodeBuffer]

Thanks for watching!

[@thedarkhorseevil2635]

Bro can you also please make videos on multithreading in brief please 🙏🙏🙏🙏

[@anandpadamala451]

super explanation

[@DailyCodeBuffer]

Thanks 🙏

[@user-kf5hb4dm6x]

Use volatile keywords while declaring refrence variable

[@rjrobinjames]

Awesome bro 👌👌👌

[@DailyCodeBuffer]

Thanks 🙏

[@dhanshyamkamath8493]

I have seen the static instance declared as volatile. What does volatile keyword do?

[@sagarsri4143]

Superb

[@DailyCodeBuffer]

Thanks 🙏🏻

[@abhishekchatterjee3750]

Once the first thread get a lock on synchonized block, the other thread will be waiting at that point , but the other threads has already passed the if condition, those are just waiting for their turn to execute the creation of the object again when the lock is released by the first thread. Is it like the if condition is going to be reevaluated again after the next thread get the lock. I am confused sinsed the synchronised block is inside the if condition. ?

[@abhishekjain6559]

You can also add a Clone example to break and fix Singleton design pattern.

[@rock_0075]

so you mean from line 22 the sync method will be shared across all threads?

[@rishabhshah8845]

Can u make java beginners to advanced video

[@MrMikomi]

Shouldn't your readResolve method call the getInstance() method? Otherwise it could return null no?

[@KratosVS]

Good work brother

[@DailyCodeBuffer]

Thanks 🙏🏻

[@KratosVS]

@@DailyCodeBuffer you should do live question and answer for interviews questions. Also live project it be fire where people can do supervhst and if they tipped you super chat you can give them personal help with the thing they having problem with the project

[@DailyCodeBuffer]

Great Suggestion
I will think about it. Thanks 🙏

[@KratosVS]

@@DailyCodeBuffer you can send notifications to your to subscribers. It can be big projext like fully functional full stack e-commerce website where every can pull and push the project in git and contribute to it. You can ask people if they can do something different and if they have trouble they can send certain fee and you can do personal one on one session to improve their application. While people on super chat who is having trouble you can show and what they may do wrong and answer the questions. I think it great idea it help lot of people. It will help people to see how you going about codding and why you use certain data structures over certain data structures. I will definitely join and I am pretty sure lot of people will join

[@simo47768]

Really nice
Still did not grasp enum example. Enum Example is too short. Not clear. How use enum to instantiate database connection ?

[@shivaanandadari6533]

public enum DatabaseConnection {
INSTANCE;
private Connection connection;
DatabaseConnection() {
try {
// Load the JDBC driver
Class.forName("com.mysql.cj.jdbc.Driver");
// Create the database connection
connection = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/myDatabase", "username", "password");
} catch (ClassNotFoundException | SQLException e) {
throw new RuntimeException("Database connection failed!", e);
}
}
public Connection getConnection() {
return connection;
}
}
public class DatabaseUsageExample {
public static void main(String[] args) {
Connection conn = DatabaseConnection.INSTANCE.getConnection();
// Use the connection for database operations
// Remember to close any Statements and ResultSets, but you might not want to close the connection itself
// as it is managed by the Singleton and should stay open for the lifetime of your application.
}
}
we can use this way to create db connection using Enum.

[@anujdosad9518]

Hi, what about using clone method? using clone method also we can break the singleton rule..

[@navinkumar6388]

Just throw the clone exception if the object clone is carried out

[@claveralvaro6245]

Holly crap i learned a lot. ty so much.

[@DailyCodeBuffer]

🙏🙏

[@navinkumar6388]

I have a query.
Why only one DB object?
If created more DB connection then it will be easy to service the concurrent request coming at same time.. right?

[@DailyCodeBuffer]

Yes, Absolutely 👍
This is just an example to explain singleton

[@smirkedShoe]

8:20 The instance variable has to be volatile else the logic won't work.

[@magiccraftideas]

Bhai hindi ma video bno...

[@ravipanchal2259]

Cloning the object will also break singleton right?

[@tanujarora4906]

Yes, Implement the Cloneable Interface and Override the clone method and throw an exception. It will fix that loop hole.

[@user-fr9jb3sm4v]

Good! New cap👍

[@DailyCodeBuffer]

Thanks 🙏🏻