The Composite Pattern Explained and Implemented in Java | Structural Design Patterns | Geekific

[@fastexpand]

Now I can skip 3 hours of class going over this and completely understand it in 5 minutes! Good freaking job!

[@BoonkiCoC14]

Man these videos are great. They are perfect. I've been looking everywhere for explanations for some of these design patterns and not a single person could explain them the way you did. Cheers!

[@geekific]

Wow! Glad you like them :) Thanks a lot

[@kineticBoss]

Your videos definitely provide a starting point in understanding clearly what a certain design pattern is.
This is great.

[@sarabloss1]

Currently covering this topic in my Data Structures class, and this was such a helpful explanation of a confusing chapter. Seeing everything visualized really helped me grasp the concept. Much appreciated!

[@geekific]

You're very welcome! Glad it was helpful :)

[@harveynorman8787]

Fantastic example and explanation

[@DemystifyFrontend]

Well explained

[@derekdevs]

Thank you for this series. It's been very helpful!

[@manalahmadi992]

I have to say that your videos are so helpful. Thank you very much

[@geekific]

Glad you like them!

[@AymenTDD]

Thank you so much, u're saving me in the night of an exam ❤️❤️❤️

[@geekific]

That's exactly why am here

[@mintdu]

it is really helped me alot! thank you very very much !

[@ception3513]

Thanks, great job!

[@seuz7520]

Yo that's actually insane. I am having a test next week in creational/ structural/ behaviour design patterns. How am I even supposed to remember all this. I am watching this video which are really nice and they explain really well but idk all of them at the same time to be examined. :/

[@geekific]

Good luck with your test! Let us know if we can help you further :)

[@seuz7520]

@@geekific thanks for the support !!

[@andresdiaz2737]

Very helpful indeed. IAre composite pattern and composition (meaning composition instead of regular inheritance in java ) the same concept?

[@geekific]

I believe watching these two videos will help clarify the concept: th-cam.com/video/Vfk6sExu8-4/w-d-xo.html & th-cam.com/video/sN2_CoB_kbw/w-d-xo.html Cheers!

[@aldolunabueno2634]

4:25 The UML diagram is missing the has-a relationship from Composite class to Component internface.

[@miichy4]

that's right

[@xintongma2976]

thanks

[@engsalahmahmoud2418]

Thanks,

[@shopdemo6384]

what a good video

[@geekific]

Thank you!

[@dadlord689]

When you have a Book that is a Box (extending the Product : Box class) - you are confused.

[@geekific]

It implements it and not extends it! Feel free to check our OOP basics video here: th-cam.com/video/Vfk6sExu8-4/w-d-xo.html for more info :) You could name the interface anything you want, but in this series our main focus is explaining the patterns and why and when to use each of them! Cheers!

[@AfriandiHaryanto]

What is the difference between Composite and Decorator?

[@geekific]

Please check the Decorator video here: th-cam.com/video/v6tpISNjHf8/w-d-xo.html

[@N00BRIUM]

Great video! "class Product implements Box" sounds a bit off. I think renaming the "Box" interface to "PriceGettable" and "CompositeBox" to just "Box" makes more sense.
// Nodes
public interface PriceGettable {
double calculatePrice();
}
// Non-leaf nodes
public class Box implements PriceCalculatable {
private final List boxesOrProducts;
@Override
public double calculatePrice() {
return boxesOrProducts.stream()
.mapToDouble(PriceCalculatable::calculatePrice)
.sum();
}
}
// Leaf nodes
abstract class Product implements PriceCalculatable {
final String title;
final String price;
}
public class Book extends Product {
@Override
public double calculatePrice() {
return getPrice();
}
}
public class Book extends Product {
@Override
public double calculatePrice() {
return getPrice();
}
}

[@geekific]

Thanks for the effort and feedback :)