What is the Singleton Pattern? (Software Design Patterns)

[@linusstockinger4571]

best yt channel for design patterns , thank you! great job!

[@marcobaccaro]

That’s a classic book. Singleton, the pattern anti-pattern :) Good content...

[@MrEditorBen]

Great job. Helped cleared some confusion on this concept

[@BeABetterDev]

Glad you found this useful DragonLord!

[@nirmesh44]

great work buddy

[@vanamutt43]

great tutorials dude, so few views but so so good. thanks mate. also, you kinda look like the doctor dude from walking dead, siddiq i think his name was:D anyways, thanks again mate

[@prabhatism]

The if condition should be inside the synchronised block?

[@fyh8848]

keep original if-check, then add another if-check in synchronized block.

[@shivambaghel9668]

yes that if cond should be in sunchronized block as when we create 2 thread (e.g.) both check for null and enter in synchronization block simultaneuosly and create 2 instance with different hashcode.. code here .. public class Main implements Runnable{ @Override public void run() { DataBaseConnectionManager obj = DataBaseConnectionManager.getInstance(); System.out.println("Thread running for "+obj.hashCode()); } public static void main(String[] args) { Thread t1 = new Thread(new Main()); Thread t2 = new Thread(new Main()); t1.start(); t2.start(); try{ t1.join(); t2.join(); }catch (InterruptedException e){ e.printStackTrace(); } } } output Thread running for 687105320 Thread running for 1582306442

[@khomo12]

Nice👍👍

[@hectorprx]

Thanks

[@mananabanana]

You forgot to update the description. :)

[@BeABetterDev]

Thank you !

[@LilMartyFarty]

Why would you not wrap all of the code in synchronized?

[@bity-bite]

Why not just make it static?

[@vanamutt43]

because static doesnt instantiate, singleton is useful when you want an instance but just one

[@fyh8848]

you could but instance will be created always when class is loaded. If it is no need, then resource is wasted.