OOP 4 | Access Control, In-built Packages, Object Class

This fourth video of the complete object oriented programming (#OOP) course in Java will clear some of the most important concepts for you.
Covering access control, in-built packages, object class, and more!
Complete OOP playlist: • Object Oriented Progra...
Take part in the learning in public initiative! Share your learnings on LinkedIn and Twitter with #DSAwithKunal & don't forget to tag us!
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- Code, Assignments, & Notes: github.com/kunal-kushwaha/DSA...
➡️ Connect with me: kunalkushwaha.com
=========================================
Timestamps:
00:00 Introduction
01:04 Example: private, public and protected modifiers
12:29 Rules for modifiers
15:56 When to use which modifier?
18:03 Important point for protected modifier
26:10 More about Packages
27:17 In-built Packages
27:36 "lang" package
28:52 "io" package
29:31 "util" package
30:37 "applet" package
31:13 "awt" package
31:49 "net" package
32:23 Object Class
34:13 Object Methods
35:31 hashCode Method
39:28 equals Method
46:06 instanceof Operator
47:50 getClass Method
50:06 Outro
#placement #dsa #interviews

[@rakeshranghani1148]

I saw many java tutorials of other KZbinrs but the my mind is not clear at so many point. Now i'm relaxed . Lot of concepts are cleared thanks men! You are the real jem.

[@40_kamlesh_kumar_agarwal39]

This is the first course i am following step to step with. Best Content 🔥

[@harshagarwal7832]

Bhai bhai 🤩🤩🤩bas intezar hi kar rha tha 4th lecture ka ....3rd part tak kya hi padha diya bhai 🤘

[@KunalKushwaha]

Awesome

[@ronitsharma0352]

@@KunalKushwaha make more videos bro

[@devesh819]

Our Hero is back with some new powers and abilities to share with us ... Your consistency is really a motivation Thx for it bro 👍👍

[@KunalKushwaha]

Thank you so much 😀

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are you from CHARUSAT

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@@mitulchavda9941 nope bytheway what's charusat is??

[@ronitsharma0352]

@@KunalKushwaha We want your consistency back kunal bhai ...

[@tirakv]

Video 4 == COMPLETED! Thank you so much for sharing this content!

[@jenith281998]

This course and videos are worth fortune and you are giving away all information for free really hats off to you man...

[@senseiKakashi07]

Great video!!❤️ Just one thing i want to mention is that at 33:43 you said it is internally doing but how it is inheriting the object class is because as child class inherits the parent class hence it can't inherit any other class(no to multiple inheritance), but we can see that parent is is inheriting the Object class hence child class is indirectly inheriting the Object class via parent class. Object -----> Parent ------> Child ----| | | |____________________________|

[@nikhilreddynama9905]

It is multi level inheritance

[@NaveenKumar-nd5cf]

simply superb Teaching @free of cost👏👏🙏🙏

[@utkarshahajare6179]

Thank you ,kunal for such awesome content!!

[@harshjaiswal1634]

Wow man... unbelievable ❤️🙏❤️

[@mayurrokade5712]

Thanks Kunal for making this course.

[@nirvattaenterprises3047]

Thanks for your contribution. Respect!

[@lohithkumar5292]

Great content, looking forward for future videos.

[@samruddhighodake223]

Never seen such an in-depth explanation before. Thanks for this amazing course.

[@10.aryanjangde]

you have not seen anything then

[@abhishekpandey-je6lq]

Good Explanation, But just one small correction when you say it is a multiple inheritance when your extended class also extending Object class. Actually you base class extends Object class and your sub class extends base class which extended the Object class. This hierarchy is an example of multilevel inheritance, not multiple inheritance. Eg- BaseClass (extends Object) SubClass (extends BaseClass, which, in turn, extends Object)

[@BackEndGenius]

In love with your content. Thanks alot.

[@indrapreetsingh9680]

Excellent efforts, Kunal!

[@Window2015]

Personal timestamp: Day 1) 8:00 Day 2) 50:45

[@pratibhayadav7112]

Idk how but these lectures just uplift my mood

[@karthikeyareddy9794]

i'm following it consistently, helping me a lot💫✌

[@dhamotharan1734]

Another excellent explanation!

[@_hulk748]

Great Explanation Sir🙇‍♂❤✨🙏

[@aryaarjun_1138]

brother you are the best.... following all your videos nd all have quality👌..bole to ek number 😉...U r just out of the crowd....nd at last thank u so much brother..u r doing great 👍

[@usenmfonuko3271]

Thank you so much Kunal

[@jamespeterson7824]

Great Content and explanation as always...

[@prakharsinha4145]

all just i can put forward a appreciation of being thankful you for providing such prestigious content! #DSAWithKunal

[@manasayellamanchili2160]

Good explanation. Thank you

[@venkateshvenky2880]

Great explanation ...

[@arpitapandey143]

Hey Kunal .. Thank you for such an amazing series . When will we get the oops notes and how many more videos are there in oops playlist?

[@debasmitamallick6489]

I want your hashmap tutorial Kunal😭 I love your way of teaching. If you get any spare time, please make a video on hashmap.

[@subham8095]

actually now i understand concept of OOPs. Such an amazing work you are doing brother

[@KunalKushwaha]

You’re welcome

[@marc8150]

Another great video! :D

[@shyamamohanty7132]

Even internally it isn't doing multiple inheritance but it is inheriting in a hierarchy i.e. SubClass extends A & A extends Object.

[@adeditz3607]

Fan Of Your Teaching 😍❤️💥

[@amcreations9192]

Worth watching ❣️

[@stuntxo3968]

Thanks Kunal sir

[@ashvinkumhar5819]

As Always Good Content

[@yashkoolwal196]

Feels so good!! completed this one also

[@KunalKushwaha]

So good!

[@murugalakshmi8417]

Thank you so much bro💯💯🩷

[@wilsonarockiasamy4938]

I like the video first and then I see ur videos❤

[@shreedharkotanur683]

Excellent teaching

[@manishbera2902]

Love the video❤❤❤

[@anmolkumar5399]

I m with u kunal sir

[@mohitchandola3435]

bro great content..🔥🔥🔥

[@user-bv9kn3rd7k]

please create the playlist for spring framework.

[@ShubhamKumar-gq4ph]

So far so Good......

[@dhirajjadhao6392]

OG mentor and Op Content

[@marufhasanmunna8193]

Please continue this course

[@sudarshan3901]

Awesome video

[@dnyaneshwarichatarkar6446]

Thanks a lot😀

[@raghavmangla2481]

Way better in quality than oops in 1shot videos

[@vishnuganta9699]

Hello kunal I’ve doubt Should I watch the lectures in a flow for days daily an hour like that or should I stop somewhere and give a gap then practice and again start. What should I do ? I need your suggestion desperately..

[@md_arfin_cse]

Great 👍

[@akshaysharma145]

Thanks alot for this video!! Would you recommend learning springboot as a fresher? and if yes then any source you recommend to follow or are you going to cover it too?

[@akashgawai5647]

Quality Content

[@yellAtMe.]

Great Job Kunal! I have been waiting for you to finish this course from almost 6 months. You must be very busy so can you at least recommend someone's channel so that we can move forward. Please do reply to this.

[@thestoic7315]

Hey Kunal, thank you for putting out quality content, especially on recursion. Can this be understood by someone from Python? I don't know Java.

[@funenjoynilaypatel4553]

are bro i know c++ not java but once you understand the flow how things work you can code in different language no problem main thing is to understand the concept which is very well explained by Kunal

[@thestoic7315]

@@funenjoynilaypatel4553 Right on 👍🏼

[@432prameela3]

Thank you

[@plutomessi21]

Box box5 = new Boxweight(2,5,6,7); box5 is of type BOX, but it is referencing to an object containing the properties of boxweight. This is possible, even tho the constructor boxweight is present in the boxweight class we can access it using a reference but only those properties or instances which are common in both BOX & boxweight. It is the type of the reference variable and not the object that determines what members can be accessed.so here even tho the object will have some extra variables that are present in the boxweight but the reference.thatvariable won’t be able to access it as the refernce variable is of type BOX and only the BOX property present in the object will be able to be modified or accessed.

[@dannyhd8301]

brilliant !!!

[@jafarmoore168]

love this

[@itsvinu]

Congratulation for silver button bro

[@trinmoydutta4879]

when a class is inheriting another class then the sub class inherits the object class directly along with the superclass or the indirectly i.e. the subclass is inheriting the super class and the super class is inheriting object class,in a multilevel manner??

[@nishantyadav7461]

you are a gem of india ▄

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Kunalism... New revolution...🔥

[@shafaq-here]

Appreciated .

[@sumanhowlader3657]

Hey, kunal from where I can learn spring framework? can you suggest anything?

[@heyiamsra5207]

very nice!

[@RahulPatel-dk9dc]

whay are we using a setter method if we can do the same using constructor?

[@ridoychandradey8337]

Now I have the knowledge of access modifiers. Love these video.

[@anuchethantc1990]

thank you

[@FALGUNIRAKHECHA]

One question, what if I create a class 'A' and make all its members + methods as private. Now suppose I create a subclass 'B' that extends 'A'. then what is the use of inheritance here when all my members/ methods of parent class are private and cannot be accessed through child class??

[@Sillysmiles76]

Great Vedio

[@raghavpatidar1070]

At 33:45 maybe we can say like ObjectClass ----> A -----> SubClass (so basically subclass is also extending ObjectClass)?

[@sdk-yourfriend1561]

What I understood is that every class you create is a subclass of the object class. So, yes Subclass is also a sub class of the object class.

[@wasim_17]

Understood 👍

[@anuragnayak9704]

How can you write two separate Java class in Java file ? It's showing me error on my IDE.

[@justamit_]

Thanks

[@suhaibalam1040]

cool stuff

[@Helly_Patel]

Thanks for teaching us like no one did till now!! One small request, please make lectures on dynamic programming as well!!

[@coolengineering3486]

agreed! dynamic programming lectures would be awesome

[@kritiksoni6006]

You know what whenever i skip 10 sec or 5 sec video assuming that ohh I know this one I have always came back again coz everything is so connected and new in this video xo haha.

[@mohdkaif864]

Java doesn't support multiple inheritance but it does supports multilevel inheritance so when you inherit any class that class or that class's parent class is already inheriting object class that is how every class must inherit object class.

[@KunalKushwaha]

Pata hai

[@antimuggle_ridhi2565]

@@KunalKushwaha ache se samjhata fir

[@visheshkumar8015]

hi Kunal,please add hashmap series as well

[@shivraj940]

kunal, Please do multi threading concept. Its very important in our work place.

[@sharathn6192]

appreciate it

[@AmanKumar-ie7zm]

DSA G.O.A.T !!

[@eliezrolerdo1632]

thanks

[@JEDhanraj]

loved

[@venutalla5932]

TQ sir

[@ArchismanBhaumik]

What is the shortcut to access these methods at 34:40 ?

[@zahaanmahajan1606]

Spoiler Alert : HashMap never came....😑😑😑😑

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😂😂😂😂😂

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🥲

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😂😢

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Ab aa gya hai bhai

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Sir, I wanna ask you about Web Development...Anyone who know please answer....I created News Web with Angular...It has 5 components....2 of them are static which are for home and contact...The other 3 are dynamic as they display News getting it from an api...How can i improve my rendering as it is only CSR?Should i use SSG for the two static?Should i use CSR+SSR etc etc ? What should be best and How can i implement it?For example if i am going to do Csr + ssg How can i use Angular + Angular Universal

[@rudram4534]

still watching consistently 😀😀😀

[@user-hm6mv6bx3e]

Can you please make a long video on operating system like you did on networking.🙏🙏

[@mirzakariaislam610]

33.40 Someone please check if it is right or wrong. Subclass is extending A. By default A is extending Object class. So Subclass is extending Object class implicitly (something like multilevel inheritance).

[@enagantisaipavanrao2326]

Every child class is a multi-level inheritance since it's parent(Base) class inherit properties from object(Topmost) class

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Someone: Define Perfection Me: Kunal Kushwaha😇

[@harshitthakkar9694]

Hey all this is lovely I completed your course loved it thoroughly but u said it in here that u will release hashmap video it never came

[@AdamRubiks]

nice.

[@joejangala]

Best..

[@mutasimahmed8975]

awesome video love the consistency ...can we also get DSA sheet or study plan ? along with this course thnx brother kunal

[@KunalKushwaha]

I have no idea what you mean by that

[@mutasimahmed8975]

@@KunalKushwaha haha no problem ..continue what your doing bhai i will follow along *i have used paid course and yours is better that to for free*

[@Sajal_Dadsena]

Is c++ course also coming?