Brijesh Saxena

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Source code could be found here: JMS-ActiveMQ

Agreed with Ilya Matveev. still we do not have any great library to handle Nulls. Optional is a good. But we need lots of improvements in that. Overall, its good article on NullPointerException. Thanks.

Thanks Manali. Appreciated. I have corrected the OrFilter and committed the updated code as well into the repository. Kindly pull the latest code to give a try. Thanks :)

Thanks for the review. Appreciated. :)

Thanks for pointing that. Will get it corrected.

Thanks for the review. Appreciated. Few points:

1) Inheritance is used to have different types of car manufacturing.

2) Unused setter/getter are provided to avoided for less experience audience; They may think immutable object is required to implement the pattern. For highly experience and genius like you the articles on design patterns are not required at all. :)

3) To make the example short and simple, I used "setters" as "operations" for template. I can also expand the example by using detailed operations like fixEngine(), fixWheels(), fixSeats() instead of just a setter. But, that will make the example lengthier.

Fix word is used to set the object. So, if some implementation does not do that? I think we need to do Null checks which normally many of us do not like do everywhere (only for 3rd party libraries or until its really needed). Also, it will be very hard to write a full proof example if the intension is to do negative programming just to break the code and not to learn the idea.

4) "do not use" ? Yeap. Agreed. In fact I never get a chance to use this pattern. May be thats the reason my example is not that good (reused Builder Design Pattern example). I wrote the article just to cover all basic articles as a start.

At the end, I will not write "do not use" since you already written that in comments.

I noted all the points you gave and I will try to find some better example for you.

Thanks for spending time on my article.

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The Source Code can be found here: Chain-of-Responsibility-Design-Pattern-Sample-Code

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Source Code can be found here: Template-Method-Design-Pattern-Source-Code

Need more articles, please visit my profile: Brijesh Saxena

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The Source Code can be found here: Interpreter-Design-Pattern-Sample-Code

Yes, even I am waiting to get language level visitor pattern in java. Using Element word to make it sync with other articles on the visitor pattern.

thanks :)

thanks :)

Agreed and aware of. I avoided using BigDecimal to keep the example simple and not even confusing for less experience audience.

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Source code can be found here: Flyweight Design Pattern Sample Code

Source Code can be found here: Filter-Design-Pattern-Source-Code

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The Source Code can be found here: Proxy-Design-Pattern-Sample-Code

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Source Code can be found here: State-Design-Pattern-Sample-Code

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Source Code can be found here: Memento-Design-Pattern-Sample-Code

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Source Code can be found here: Visitor-Design-Pattern-Sample-Code

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Source Code can be found here: Iterator Design Pattern Source Code

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Source Code can be found here: Observer Design Pattern Sample Code

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Source Code can be found here: Facade-Design-Pattern-Sample-Code

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Source Code can be found here: Abstract-Factory-Design-Pattern-Sample-Code

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Source Code can be found here: Real-Builder-Design-Pattern-Source-Code

and Builder-Design-Pattern-Sample-Code

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Source Code can be found here: https://dzone.com/articles/command-design-pattern-in-java

Thanks :) You may visit to my profile https://dzone.com/users/3094163/brijeshsaxena.html to find some more articles on design patterns.

https://github.com/BrijeshSaxena/design-pattern-singleton

https://github.com/BrijeshSaxena/design-pattern-nullobject

https://github.com/BrijeshSaxena/design-java-enums-sorting

https://github.com/BrijeshSaxena/design-java-enums

https://github.com/BrijeshSaxena/design-pattern-strategy And https://github.com/BrijeshSaxena/design-pattern-factory

https://github.com/BrijeshSaxena/design-pattern-decorator

https://github.com/BrijeshSaxena/design-pattern-bridge

https://github.com/BrijeshSaxena/design-pattern-adapter

https://github.com/BrijeshSaxena/design-pattern-composite/tree/master/composite

Agreed. But just to keet the example simple and not to make audience any confusion, I avoid using AbstractFactory into this example. I will cover that in another article separately.

Thanks for pointing this. Corrected. :)

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I thought its well understood.

Sorry to hear that. The article https://dzone.com/articles/strategy-vs-factory-design-pattern-in-java is available now. Please have a look :)

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In the examples of this article I have implemented Serializable and Clonable to demonstrate how you can make serilization and coning support on your Singleton class. So, any accidental misuse of the Singleton class via serialization or cloning is handled.

Still the example is not supported or proof for Reflection as I indicated as well. For reflection use Enums.

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Like to know more on Singletons? Visit my another article Singleton making more effective

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OK. the article was not about singleton vs no singleton. It was only about how to use. But your suggestion make sense. I will try to add a section on this as well soon.

I see. I will add the correction of the approach just below the example. Will that be OK for you?

Just to indicate the issue with the 1st approach. I have seen many good programmers coding lazy intialization without thinking for double locking.

We should use lazy loding method with double lock. Will add an example soon.