Java Design Pattern Interview Questions and Answers [ MOST ASKED DESIGN PATTERN INTERVIEW QUESTIONS]

In this video you will learn about Most Asked Design pattern Interview Questions with practical examples and live Demo for freshers as well as experienced. Please refer to below link for part 2
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Java Design Pattern Interview Questions part 2
• Java Design Pattern In...
In Video of java interview questions and answers we have covered live real time coded example and flow charts to illustrate this and for better visual understanding. Content here is servers just theoretical purpose. Practical Real time examples with flow charts will be covered in video itself.
Q) What do we need Design pattern-
A) As Design Patterns are well documented and understood by software architects, designers and developers, then their application within a specific solution will likewise be well understood.
Patterns give a software developer an array of tried and tested solutions to common problems, thus reducing the technical risk to the project by not having to employ a new and untested design, thus saving time and effort during the implementation stage of the software development lifecycle
Q) What are the Creational Patterns?
Creational design patterns are related to the way of creating objects.
This pattern is used to define and describe how objects are created at class instantiation time
Q) What Is Factory Pattern?
In the Factory pattern, we don't expose the creation logic to the client and refer the created object using a standard interface.
Steps:
1) create main class which call factory class.
2) Factory class returns required class instance
Q) What Is Abstract Factory Pattern?
This factory is also called as factory of factories.
Abstract Factory lets a class returns a factory of classes.
So, this is the reason that Abstract Factory Pattern is one level higher than the Factory Pattern.
An Abstract Factory Pattern is also known as Kit.
Steps:
1) create main class which call factory of factory class.
2) Factory of factory / factory Producer creates instance of factory class.
3) Factory class returns required class instance
Q) What Is Singleton Design Pattern?
Singleton pattern is one of the simplest design patterns in Java.
This pattern involves a single class which is responsible to create an object while making sure that only single object gets created.
This class provides a way to access its only object which can be accessed directly without need to instantiate the object of the class.
Steps:
1) create main class which call CacheImpl Class.
2) CacheImpl class has 2 methods : 1st to load the key value in map and create the cache. 2nd to return the required cloned object.
3) The main class , parent of all reuired concerete class contains cloning technique. Rest concrete class are normal POJOs, nothing special.
Q) What Is Builder Design Pattern?
Builder Pattern refers to approach that focuses on constructing a complex object from simple objects using step-by-step approach.
Major roles used in this design patterns are :
Complex Object / Final Product - e.g. house - complex object which we will generate with builder design pattern
Builder - abstract class / interface that defines all ways to create the product. It also has getFinalProduct method that will finally return complex object.
ConcreteBuilder - multiple Builder Impls that will give different final objects which are complex to design,
Director: Controls complex object creation. It has 2 main goals : 1st to call appropriate concrete builder class to create correct complex object. 2nd to return that complex object.
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[@chinmayabhyankar4526]

Your explanation is awesome madam. Thank you for your efforts, very great explanation. keep up the good work.

[@CodeDecode]

Thanks a lot Chinmay 🙂👍👍

[@sanyammadaan2396]

FANTASTIC!!, I have reading these concepts for almost a year I guess, but never truly understood them. A big thanks for such great work. Keep the good work going.

[@CodeDecode]

Thanks for the motivation 👍

[@aman_deep21]

Thank you for explaining these with code examples, as it helped me to get more clarity about the use cases of creational design pattern through them.

[@CodeDecode]

Thanks Aman 👍👍 m glad it helps.

[@muralinayani]

I used to watch your sessions to attend interviews. It helps me alot. Thanks for the such nice explanations.

[@CodeDecode]

Thanks for writing back to us 👍👍

[@prajwalshetty3880]

The way you have explained these design patterns are impeccable, especially Abstract Factory and Builder Pattern with great Real time examples. Keep up the Good Work. A big thanks to you :)

[@CodeDecode]

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[@hackerhacked625]

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[@CodeDecode]

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[@akshaysardhara705]

Your content gives senior-level answers of topics any junior can understand and crack all interviews.

[@CodeDecode]

Thanks Akshay for the nice words......

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[@CodeDecode]

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[@gandhambharathchandra5135]

@@CodeDecode please put structural design patterns

[@CodeDecode]

Sure will upload soon

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@kritikashukla9937]

Such simple and sleek explanation. Much grateful! :)

[@CodeDecode]

Thanks Kritika 🙂👍

[@MBilalabdulkany]

Crystal clear. Good job and helpful for a community of professionals!

[@CodeDecode]

Thanks Bilal 🙂👍

[@digitalbytes8714]

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[@CodeDecode]

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[@CodeDecode]

Thanks Balu. We are so proud that you are cracking interviews 😊😊👍👍. Keep rocking keep shining man. All the very best for your future.

[@vishalkadu7688]

Like the way you explains everything starting with theory then practical implementation.. never found such a well structured tutorial..keep going with the same 👍

[@CodeDecode]

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Watching your videos is sufficient to attend any backend interviews

[@CodeDecode]

thanks .....

[@anirbanhaldar4640]

I am speechless! Your explanation is beyond expectation! keep up the good work! what makes you different from others is your examples are from real time scenarios..what most interviewer expects! hats off Madam! take a bow!

[@CodeDecode]

Thanks a ton Anirban 🙂👍

[@kushshrma4844]

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[@CodeDecode]

Thanks 👍👍

[@manjulanam3968]

Thank you for the clear explanation with examples!

[@CodeDecode]

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[@sonujain4768]

It was helpful. Thank you for covering "Design Patterns". Please make videos for remaining design patterns.

[@CodeDecode]

Thanks for watching. :) Sure will do that 🙂

[@shubhampote5332]

Ive been watching your videos for sometime now and the way you explain is amazing ma'am. Thank you so much

[@CodeDecode]

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[@rajatgupta7488]

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[@CodeDecode]

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[@sindhusudhakaran1731]

thank you so much .. the examples used in the video, helped in following the explanations

[@CodeDecode]

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[@mithdhan]

This is too good and keep the work continued. Excellent videos and it helps to understand in detail of each java patterns.

[@CodeDecode]

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[@suryabandaru7924]

This is a simply superb video with very good practical examples. Thanks ton!

[@CodeDecode]

Thanks Surya 👍👍🙂🙂

[@abc5.-_]

Crystal clear n to the point tutorials, great set of videos can be found here in this channel....Nice explanation ma'am

[@CodeDecode]

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[@intrdaytrader230]

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[@CodeDecode]

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[@ganeshtiwari3318]

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[@CodeDecode]

Thanks! 😃

[@shalakaarekar2432]

Amazingly explained. Kudos to make this look so simple. 👍🏻

[@CodeDecode]

👍👍thanks Shalaka

[@abhijitrode]

Thanks a lot. Really helpful. Code even explains further

[@prabakarang1681]

Thanks for your video. It's really helpful for me. Yes pls explain all design patterns.

[@firsttestlasttest1951]

Superb explanation with real time examples; You made me to understand these concepts. Thank you.

[@CodeDecode]

😊👍

[@gigmelepcha6546]

Understood in one Go, Beautifully Explained

[@CodeDecode]

Thanks gigme......

[@sunshinemeadows9462]

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[@CodeDecode]

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[@CodeDecode]

Thanks nikhil

[@everythingsoftwarebyrushi1808]

I really appreciate and thank you a lot Madam. The video explains the content in a crystal clear manner. I will definitely share this with my peers and recommend it to developer at any level.

[@CodeDecode]

Thanks Rushikesh. 👍👍we are glad to have u as a part of code decode family. 👍👍keep learning keep shining ⭐✨

[@aleenajohn7122]

Awesome..No words to explain.Its a great effort.Thank you so much.

[@CodeDecode]

Thanks Aleena 🙂👍

[@sankarasubramanian568]

Thanks for this :) nice explantion !!

[@CodeDecode]

Thanks Sankara 🙂🙂

[@SitaramLanka]

Very good explanation. Thanks for making this detailed video !!

[@CodeDecode]

Thanks Sitaram 👍👍

[@DurgaPrasad-xp5fi]

I like the way of explanation. It's simple and understandable. Please upload the remaining concepts.

[@CodeDecode]

Thanks a lot durga 🙂👍

[@avinashrawat5823]

Just Finished Design pattern Creational Part , Understood line by line with Example, Moving forward to structural part , Thanks

[@CodeDecode]

😊👍👍

[@vulligadlarohith5541]

Sincerely appreciate your efforts in providing the quality sessions and helping the candidates crack the interviews! 👍👏 Thanks a lot madam, keep inspiring us. Blessed to have gone this channel.

[@CodeDecode]

This means a lot to us Rohith. Thanks for the kind words. 👍🙂

[@vulligadlarohith5541]

@@CodeDecode Kindly cover the other sets of design patterns too and this shall be a one stop solution channel for all aspirants. Keep up the good work

[@gajendraparmar6162]

your content is awesome,i'm able to crack the interviews.Thanks to your content and ease of explanation

[@CodeDecode]

That's a great news Gajendra that you cleared your interview round. Congratulations 👏👏🎉🎉🎉🎉. Keep learning keep growing Man 👍👍

[@chetankumarchandavarkar6149]

very nice explanation, appreciate your effort. thank a lot 🙏🏻

[@CodeDecode]

Thanks 🙏

[@ankurtiwari9107]

Nicely explained, Thankyou!

[@CodeDecode]

👍

[@kavitakumawat4929]

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[@CodeDecode]

Thanks for the motivation kavita

[@nagendrasai3946]

What an explanation!!!….awesome….you are the best….

[@CodeDecode]

Thanks 😊😊

[@Laxmiprasadlaxman]

Thank you so much….!! Your videos are very informative, helpful and very interesting..! Thanks a ton for sharing this. ❤ Please do create for other design pattern also. 🙏🏻

[@amitkumar7221]

Most most important and complex design pattern you explain very well which could we understand well thanks for this ❤❤

[@vrushalikarla8795]

This session was Very helpful and with details of every pattern. Please explain all other design patterns as well

[@CodeDecode]

Sure will make other parts too soon

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@omkardhorge6134]

You explained it very well. Would love to see the vedios on remaining categories.

[@CodeDecode]

Sure 👍👍🙏🙏

[@sachida23]

Please share the rest of the design pattern's in detail your explanation is really in deep, thank you so much !

[@priyankaS17]

Awsome explanation with clarity. Please upload videos on other design patterns like structural and behavioral . Waiting for it. Thanks a lot for this video.

[@CodeDecode]

Will upload that next 👍

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@prsutar2478]

Nice Explanation, One more thing in prototype method, to add delay of 5 seconds in creating objects using new keyword to simulate the cost of creating new object and object created using prototype are fast without delay of 5 seconds

[@CodeDecode]

That's a very nice suggestion 👍👍

[@rohinikothavade1761]

Cracked interviews for multiple MNCs by going through your play list.. thank you😊

[@CodeDecode]

Many many congratulations on clearing interview rounds Rohini 🎉🎉🎉🎉 keep learning keep shining 🌟🌟

[@divyareddy8747]

How many years experience ?

[@devanshusharma3733]

I love that watching your knowledge full videos👍. Thanks lot to creating knowledgeble video🙏. If you can give some real life example in design pattern then it goods to relate. If possible then please make video on design pattern use in spring framework. It can help to make easier spring related queries in interview.

[@CodeDecode]

Sure Devanshu. Will do that 👍👍

[@sibinnagarajan5366]

Very helpful..thanks a ton!

[@CodeDecode]

You're welcome

[@sagarmeena0210]

very good explanations with code....thanks will have in the interviews

[@CodeDecode]

👍👍

[@vedikaashtekar4356]

No where could able able to find the crisp and clear explanation like your videos. Kindly explain the next patterns too. Behavioral and JEE.

[@CodeDecode]

Thanks Vedika 🙂👍

[@itsjeevani4617]

You are doing an amazing job by helping many people to understand or brush up the core concepts. But I would like to mention that what you are referring as a hashcode is not actually a hashcode. It's an address to an objects memory location. Hashcode is certainly be a number, formally an integer... However, you are an angel for many to land in their dream jobs. Keep rocking..

[@shravanijanadri2281]

It’s hashcode only , hexadecimal representation of an object , please read through basics before commenting might mislead others

[@devendra.sanghavi]

thank you again

[@CodeDecode]

Thanks a lot Devendra 🙂🙂

[@SatyaPatradtcom]

It would be nice if you upload Behavioral design patterns. Thanks in advance:)

[@CodeDecode]

Sure. Will upload soon

[@priyanka0112]

please cover facade and behavioral design pattern. Also cover SOLID Principals. Your way of explainaition is amazing.

[@CodeDecode]

Sure priyanka we will plan and make video on the same. Thanks for the nice words.

[@kittunew]

I was always struggling with DP. You are awesome girl. Thanks a lot.

[@CodeDecode]

Thanks🙂🙂

[@rediettadesse5488]

This is Awesome, Thank you very much and please keep it up

[@CodeDecode]

Thanks Rediet...

[@sandeeppatil5587]

Very nice and very easy to understand the way of explanation. Thanks a lot.

[@CodeDecode]

Thanks sandeep

[@seelamrameshreddy702]

Thanks for the lot of effort. Please upload videos of all other design patterns as soon as possible.

[@CodeDecode]

Sure

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@demchuckdima]

In case of singleton you should also add volatile

[@balakrishnagajam]

I am preparing for interviews now. Its quite helpful. Please do remaining Design patterns also. Thanks in advance.

[@CodeDecode]

Sure will upload them soon. All the very best for your interviews. 👍

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@pdolley5622]

I really appreciate your hard work and it's helping a lot.. I don't find any channel or anyone explaining the way you are doing... Small request it would be great if u ionout or resequence ur playlists... Please

[@CodeDecode]

Sure. We have updated the playlist now. Thanks for the suggestion👍👍

[@CodeDecode]

Thanks for the nice words dolley 👍👍

[@anupamdas3687]

I like explanation ...it is simple and understandable...please upload remaining design pattern..

[@CodeDecode]

Sure. Will upload soon

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@tapanmohanty5461]

Awesome Content...Please add more related to Microservice interview questions

[@CodeDecode]

Sure will upload soon 👍👍

[@umamaheswarreddy9204]

Thank you. You just awesome 😍

[@CodeDecode]

Thanks Uma🙂🙂

[@basitsayeed2111]

Simple and quality content

[@CodeDecode]

Thanks Basit 🙂👍

[@EasyTechStudios]

Great content. Please upload more videos.

[@CodeDecode]

Sure :d

[@swapnilmishra697]

Please create videos on other designs patterns as well

[@shaileshprajapati2326]

Good work, awesome explanation. Could you please create more videos for remaining design patterns...behavior and structure design patterns...

[@CodeDecode]

Sure

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@hometv8446]

Helpful Explanation Thank you

[@CodeDecode]

🙂👍

[@ashwithchakinarapu1906]

Very Good explanation Thanks for providing videos...

[@CodeDecode]

M glad you found it helpful

[@scoobydooby4672]

Nice explanation. Can you please cover all missing design patterns i.e. behavioural and remaining structural design patterns interview questions thanks

[@Priya1_123]

Please post other design patterns as well. Nice explanation as it includes code as well

[@CodeDecode]

Sure will upload soon

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@subhamgoswami8607]

Great video really helped .. initially had some complexity understanding abstractFactory but after giving it a try now i am comfortable .. thanks a lot :)

[@CodeDecode]

👍👍😊😊

[@saurav5s]

You are a legend. Thanks a lot !

[@CodeDecode]

Thanks for the nice words saurav

[@hansirawat9322]

You're outstanding. Please create videos for other patterns as well.

[@CodeDecode]

Sure will do that 🙂

[@hansirawat9322]

@@CodeDecode You're too good in explaining concepts!!!!!!Please make for Spring and Java 8 streams & Predicate as well. All my friends are watching your videos. it's helping us in college project :)

[@CodeDecode]

That's very nice thing to say hansi. thanks for watching. i will upload these topics soon.

[@kirushnashirre6791]

Hi Ma'am, You are doing a great job!! please make videos on other Design Patterns too!!

[@CodeDecode]

Sure 👍

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@rajajodhani]

Just one word "Amazing"

[@CodeDecode]

Thanks Raja 🙂🙂👍👍

[@davidgupta110]

Nice Explanation with good clarity.

[@CodeDecode]

Thanks 👍

[@prajyotprabhu827]

Great! Nice explaination!

[@CodeDecode]

Thanks Prajyot 🙂👍

[@vikasgc3456]

Very well explained!! Please do create other design patterns.....

[@CodeDecode]

Thanks 😀. Our next video will be on other design patterns ...

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@abhinavmishra9690]

Thanks a lot. All Design patterns explained beautifully and in a crisp manner alongwith code implementation. 🙂👏. Can you please make some more program and code implementations of java 8 features using custom objects like Employee class etc.

[@CodeDecode]

kzbin.info/aero/PLyHJZXNdCXsfcMboYwGoL6wKAFPxljz5W

[@subramanianchenniappan4059]

Thanks . I am an experienced java dev. This is helpful for intvw prep 😊😊

[@CodeDecode]

All the best for your interview preparation 👍

[@spiderweb5747]

very good in depth explanation, its easy to understand. Please do videos on other design patterns as well and please do some videos on java 8, maven, docker, if possible.

[@CodeDecode]

Sure nice suggestion. Will make videos on them soon

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@pragyanaranjanbiswal8419]

There are few other steps for creating object which we can consider in this Singleton DP. Like cloning, Serializable etc. If you will cover those then I think we can call it as perfect Singleton class. Rest awesome lecture.

[@CodeDecode]

That's covered in core Java part. There I have covered ways to create a singleton classes. That's why I have given just one way to create singleton class here as we have already covered ways in previous videos.

[@CodeDecode]

This video was specific to design pattern hence i don't want us to deviate from our objective. Please do watch other videos for other ways. Thanks for watching 👍😊

[@bvrvenky1447]

Please cover the complete design pattern It's very useful vedio

[@vinothkumarg7731]

Very good and clear explain, understanding becomes much easier,the way of solution and approach is (theory explanation +practical solution) is interesting for each question. Pls do more on this mam.

[@CodeDecode]

Glad you liked it

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@sajalmathur549]

please cover other design patterns also. Please release new video everyday. You are good at it

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@thaaranya_anbarasu]

Wonderful explanation. Please do this kind of videos in detail

[@CodeDecode]

Sure thanks 👍😊

[@preethakandasamy5567]

Ur explanation was simple and clear.. reading from websites weren't this effective.. it was that understandable.. please can you explain other design patterns too?

[@CodeDecode]

Sure. Will create soon

[@CodeDecode]

Flyweight(Structural) and Proxy Design Pattern is live now kzbin.info/www/bejne/h5fRi3qXopxpoac

[@AshishSingh-rx4sq]

Great video!

[@CodeDecode]

Thanks Ashish

[@sattibabuchittala]

We want all design patterns, explanation madam. It is really amazing video

[@CodeDecode]

Sure 🙂👍

[@mouryas4671]

Please cover the rest of the three design patterns. As all the Content is so useful

[@CodeDecode]

👍 sure