Core Java With OCJP/SCJP: OOPs(Object Oriented Programming) Part-7||overriding ||varargs method

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[@Trading_Sopt123]

Agree

[@prakherjindal5440]

personal timestamps - overriding with varargs - 10:15-11:35, 14:30-16:00 overriding with variables - 22:50-24:30 Difference between overloading and overriding - 49:00-51:30, polymorphism - 01:07:00-01:10:30, 01:12:30-01:13:20, 01:17:30-01:18:45 When we should use parent reference to hold child object  - 01:21:30-01:28:50

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[@radhikagadve]

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the this the punch line in interviewer room🤩🤩🤩

[@rahulnigam7529]

very good definition of Polymorphism ... A boys Start with Love ... :) ... We are very happy when Durga Sir told for notedown ...ha ha ha

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[@rakeshgupta7557]

Beautiful defination of polymorphism never forgatable

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[@BaluB-nj8xb]

exactly😝😝😝

[@maheswarani5485]

wowww....final touch polymorphism .....example ....so...nice.....FRIENDSHIP.....

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[@kanchannautiyal2429]

Awesome. Blossum..😋😍 explanation.....

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[@RahulGupta-ly2uu]

at 47:57 in 7th point of throws keyword read the property carefully and at 54:25 by solving first point sir told us its overriding instead of overloading

[@kunwarmaurya2025]

sir is right , it is overRiding not overLoading how it is overLoading? even method's argument type is same then how??

[@johncenakiwi]

child method doesn't throw a checked exception. parent can throw whatever type of exception it wants to throw. This is still overriding.

[@venkatasaiinjarapu8800]

Hello There! Actually, I was also confused at the 1st time when I saw the 1st point Is that why overriding instead of overloading? Ans: Parent class method M1(int x) -- M1(int )[Method Signature] Child class method M1(int i)------ M1(int )[Method Signature] here both parent and child methods are the same signature so method overriding concept is applied. Thank You, Happy Learning :-)

[@nikhilchaubey5889]

Best Polymorphism explanation

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[@johncenakiwi]

I think P p = new C() makes much more sense if you use it in the context of an Interface. An interface will have some methods and the child will implement (override) all those methods. When you say p.m1() where p is the parent reference and m1() is the overriden method in C, child's m1() will be called, which is dynamic binding. Now suppose in factory design pattern: 1. We have 2 classes: PizzaOrderingSytem and PizzaFactory 2. We have 1 interface : Pizza 3. We have 3 implementation classes of Pizza : ThinCrustPizza, CheeseBurstPizza & MexicanPizza 4. PizzaOrderingSytem takes in the name of the type of pizza to be ordered in the form of a String e.g., "ThinCrustPizza" 5. Now PizzaFactory.getPizza("ThinCrustPizza") is called from inside PizzaOrderingSytem , which returns the type of pizza and we perform operations using methods like p.bake(), p.addToppings() 6. In PizzaFactory's getPizza(), using switch case, we return the new Object of the pizza which has been ordered, for e.g return new ThinCrustPizza(); This is the most important part. THE REFERENCE THAT YOU CAN USE TO STORE ANY TYPE OF PIZZA IS Pizza p; Now, on this p, you can call any of the child' methods you want. This example is heavily inspired by Head First Design Patterns books' Factory Design pattern chapter.

[@राजनगोंगल]

👍👍👍👍👍👍

[@harimutyapuwar5257]

Excellent

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[@pratiktekade9126]

Amazing

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@@DurgaSoftwareSolutions are there practice sessions for core java?

[@amansinghrajawat1307]

@1:00:00 Polymorphism

[@tejeswarpala2841]

I got clear clarity. 🙂

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I think 4th piller of OOPs is DURGA sir then only it will stand STRONG 🙏🙏

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[@satyasainadh5898]

Sir 6 point at riding side i think access modifier should be same or less restrictive access modifier have to use as said in pervious videos🤔🤔

[@kattakapilkumar]

super sir.really help full

[@rahulranjan5067]

Sir Can we consider the Abstraction as 4th pillar of OOPS? Because it reduces the complexity of the code.

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[@prasadmahakal2361]

Thanks alot Guruji.

[@kiranvrao9714]

Very helpfull

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[@yoyovermadon4522]

awesome tutorial..................No objections.................Only objection is at end of lecture when you say, you don't have experiance for stay wid that definition. (Very funny)

[@MrRoy-f4x]

can anybody tell me where is durga sir rightnow, is he still teching? As there is no such current video of durga sir.

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[@Yashkumar-m05]

👍

[@ranveervaghela7030]

Completed watching on 12-05-2024 at 5.52 PM

[@prakharanand7778]

I have a doubt. When we use P p = C c( ); p.m1( ); in overriding how are we able to access child class C's m1( ) method if we can't access child class method here? I know overriding follows method resolution based on runtime object, but this means that parent reference child object rule fails here?? Please explain.

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[@hardiknpandya]

Rule Doesn't fail brother.... you can use child method m1 using p because its part of parent class also... if child contain m2 method.. you can't call that using p (parent reference) because it's not part of parent class...

[@vishalgaikwad873]

16.09 output is Parent Child Parent

[@justforkids1]

Hi, i am having concept of that overloading always takes place in same class but for var-arg example for over-riding which turns into overloading for child parent class.so is this a right behaviour? Can overloading takes place in parent child class?

[@vikrantharne8576]

by default parent class methods are available to child...again child is having same method with different parameters so makes it overloading...dnt know exact answer but i think this may be concept behind it..

[@radhikagadve]

the child class C already has access to parent class vararg method, so consider by default the child class has the method in it (even though u dont see it in the code just imagine this as virtual section) and now another method with same name and diff arguments is defined in the same class, so as you already know this is what you call overloading.

[@saibhavaniande1140]

tq sooo much sir

[@leacoder2903]

completed. thanks sir.

[@taniyachowdhury8375]

hi sir, if parent class method is normal method and child class is var args method the output is parent,parent,parent...what is the reason behind it? because of least priority of var args method? Kindly reply

[@leacoder2903]

hii Taniya yes, as the parent class methods by default available to the child so it checks the precedence. you are right

[@leacoder2903]

you have got nice doubt

[@leacoder2903]

it is overloading right.so, compiler is going to handle the method resolution based on the reference type. and if that reference type is Parent, you get output parent and if that reference type is Child then in child class.... parent class method is also available that is normal method and takes precedence. so output is parent

[@taniyachowdhury8375]

Thank You Sir

[@tobyflenderson7176]

When you overload the m1() as m1(int... x) and m1(int x) and call m1(2) with one argument, then the normal m1(int x) gets called. So when you have a m1(int x) in parent class, it gets extended to the child class and when you do P p1 = new Child() and p1.m1(3); the inherited normal method of the parent gets called because there's only one argument

[@lakshmiprabha161]

Good explanation sir. I have a doubt that, var arg method has less priority than normal method (cz it is old method) in method overloading. Like here in overriding w.r.t var arg method you said o/p will be parent. How is this possible sir, here also it is a method overloading , so the o/p will be child only know? Its confusing sir. Could you help me to resolve it?

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[@krishnaverma7744]

Hi sir I just have one doubt in var arg method example, As u said sir var arg method will be only overriden by var arg method and for this first example of the video u said like it is overloading but sur if it is overloading then also it has a method in child class which accpets int argument? So why parent method getting called? If a method which takes int arg and is more specific also so child method should get called?

[@lakshmiprabha161]

Hi sir, if you clarified this doubt? Am also having same doubt right now. Could you pls explaon me

[@suryaveersingh3593]

Sir which compiler is this ?

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[@sateeshbabu5792]

super sir

[@srikanthy7164]

wt is meant by co varient return types

[@zippy.gaurav]

If the parent class method has a return type of Object then the overriding method in it's child class should have a return type that is a child of the parent method return type. These return types are co-variant return types.

[@krupabhavsar3827]

Last example 😅😅😅😛😛😛

[@sankalparora9374]

Sometimes I wonder - who are these students which are learning. I mean I know there will be a mix of school students, college student, and working professionals. But who would be in majority ?

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[@johncenakiwi]

This still doesn't explain why P p = new C() is used. Object 0 = l.get(0) makes sense, but why use P p = new C()?

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[@johncenakiwi]

​@@navyabalram695 I think P p = new C() makes much more sense if you use it in the context of an Interface. An interface will have some methods and the child will implement (override) all those methods. When you say p.m1() where p is the parent reference and m1() is the overriden method in C, child's m1() will be called, which is dynamic binding. Now suppose in factory design pattern: 1. We have 2 classes: PizzaOrderingSytem and PizzaFactory 2. We have 1 interface : Pizza 3. We have 3 implementation classes of Pizza : ThinCrustPizza, CheeseBurstPizza & MexicanPizza 4. PizzaOrderingSytem takes in the name of the type of pizza to be ordered in the form of a String e.g., "ThinCrustPizza" 5. Now PizzaFactory.getPizza("ThinCrustPizza") is called, which returns the type of pizza and we perform operations using methods like p.bake(), p.addToppings() 6. In PizzaFactory's getPizza(), using switch case, we return the new Object of the pizza which has been ordered, for e.g return new ThinCrustPizza(); This is the most important part. THE REFERENCE THAT YOU CAN USE TO STORE ANY TYPE OF PIZZA IS Pizza p; Now, on this p, you can call any of the child' methods you want. This example is heavily inspired by Head First Design Patterns book's Factory Design pattern chapter.

[@AyushMo]

@@johncenakiwi The answer is polymorphism in case you're still wondering. I don't know who's asking and who's answering, looks like both accounts are yours lol, but anyway, Using a parent reference to hold a child class object is all about polymorphism.

[@c.danielpremkumar8495]

What does the letter 'S' stand for in OOPS ?

[@saikrishna2235]

its Object Oriented Programming System

[@knowledgekumar3623]

system

[@balla4004]

@@saikrishna2235 and. @knowledge kumar thanku!!

[@AyushMo]

Okay, so let's get this straight. Parent p = new Parent(); and then p.m1(something) will call m1() of P Child c = new Child(); and then c.m1(something) is overloading, and now selects best match from child and parents’ method, and that is matched. Finally, Parent p = new Child(); this one is where ONLY the parent’s method can be called, early binding. Now go back, everything should make sense In the example from the video, if the parent had m1(int) and child had m1(int...), then the output would be parent, parent, parent. I saw a few comments down below asking how, hopefully this should explain it.

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[@jvsnyc]

I don't think any time that polymorphism is in play that "early binding" is happening. Early binding means that the code that runs isn't affected by the actual type of the object, but only chosen statically by the compiler at compile time. If the parent overload selected doesn't have a child overrride that matches it, then yeah, static binding rules. If it does, the parent method overload will be matched, but the code that will be called at runtime will depend on the actual runtime type of the object that is referred to at the time.