Java dynamic polymorphism ✨

Java dynamic runtime polymorphism tutorial explained
#java #dynamic #polymorphism #runtime
//*************************************************
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
//Dynamic Polymorphism
Scanner scanner = new Scanner(System.in);
Animal animal;
System.out.println("What animal do you want?");
System.out.print("(1=dog) or (2=cat): ");
int choice = scanner.nextInt();
if(choice==1) {
animal = new Dog();
animal.speak();
}
else if(choice==2) {
animal = new Cat();
animal.speak();
}
else {
animal = new Animal();
System.out.println("That choice was invalid");
animal.speak();
}
}
}
//*************************************************
public class Animal {
public void speak() {
System.out.println("animal goes *brrrr*");
}
}
//*************************************************
public class Dog extends Animal{
@Override
public void speak() {
System.out.println("dog goes *bark*");
}
}
//*************************************************
public class Cat extends Animal{
@Override
public void speak() {
System.out.println("cat goes *meow*");
}
}
//*************************************************

[@BroCodez]

ALSO KNOWN AS RUNTIME POLYMORPHISM
//*************************************************
import java.util.Scanner;
public class Main {
public static void main(String[] args) {

//Dynamic Polymorphism

Scanner scanner = new Scanner(System.in);
Animal animal;

System.out.println("What animal do you want?");
System.out.print("(1=dog) or (2=cat): ");
int choice = scanner.nextInt();

if(choice==1) {
animal = new Dog();
animal.speak();
}
else if(choice==2) {
animal = new Cat();
animal.speak();
}
else {
animal = new Animal();
System.out.println("That choice was invalid");
animal.speak();
}
}
}
//*************************************************
public class Animal {
public void speak() {
System.out.println("animal goes *brrrr*");
}
}
//*************************************************
public class Dog extends Animal{
@Override
public void speak() {
System.out.println("dog goes *bark*");
}
}
//*************************************************
public class Cat extends Animal{
@Override
public void speak() {
System.out.println("cat goes *meow*");
}
}
//*************************************************

[@noisyguest5249]

Dam u wrote a whole essay of codes in the comment section

[@AHSANALI-ev7sx]

Got it ...its easy thanks cool that you post code here...bro this an amazing channel...I dint know why its underrated

[@BroCodez]

I cheated. I copied and pasted it from my IDE lol. Don't tell anybody

[@noisyguest5249]

@@BroCodez Liar!!!!!!!

[@noah77]

@@BroCodez it's ok, you still helped

[@nikitamarkovski7121]

One of the most understandable lessons on RUclips. Thank you Bro!

[@LamNguyen-nm1fq]

Love this channel! I spent a whole week trying to understand polymorphism and it was really a nightmare since I couldn't get anything from the lecture at uni. Your video really save my life. Hope that you have patreons so that I could support :3

[@kemann3815]

The example at the end was great. I think i got a good idea of how it works. Thanks a lot ❤

[@cdjosh3568]

Great vid, I like the video game examples, keep them coming!

[@MarcusGrey]

You explained everything so well !! *subscribed*

[@joviksalmeron9664]

Great! You made it very understandable! Good job!

[@sunshine1538]

Thank you Bro Code. Your video helps me a lot to understand polymorphism! I've spent a few weeks catching those concepts before watching your videos. I should've found this early.❤

[@yonatan_song]

Great, man. I like the way the example is given. To the point

[@meltdown6856]

Man I just looked at ur sub count and you have Grown!! Great job with the videos!

[@BroCodez]

thanks Melt Down!

[@AHSANALI-ev7sx]

Amazing job...love the way you explain

[@omersond4891]

i liked that example with pokemon. that's what i like about this channel. examples are given of what certain methods are used for.

[@kedea159]

Thank you bro! let's fight the algorithm :D you deserve it

[@muhammedenesgokdeniz6201]

You are awesome man . Thanks a lot

[@iztillanurulla151]

I watched a lot of RUclips Java tutorials, You are the best, and I hope you can create more practice Task questions and solutions videos

[@Dinesh0502]

Nice Example Earned a sub :)

[@kippenvogelchen9717]

ty! Very good explained! :-)

[@user-zq6yx7of5f]

Thank you very much!

[@angelcastineira2561]

thanks for the video!

[@danny.3036]

Thanks, Bro! ☕ You're awesome!

[@azizchahbi3538]

Good explanation and examples

[@jamesarden7554]

great video. great teacher

[@khaledelsayed3507]

Thank you for free courses ❤

[@renecabuhan1675]

My ged u explain it clearly bro. Thank you

[@rafikcherfa478]

thank you bro

[@Wai-uc7tg]

I really like this channel. Thanks Bro Code.

[@hgatl]

awesome videos for beginners

[@noisyguest5249]

I subbed btw

[@TheEvertonDias]

Thanks, Bro!

[@suryaa5564]

Thank You So Much

[@minhtetpaing1695]

Thank you so much sir.

[@camerald8257]

so amazing 😮

[@SereneEverhart]

# 1 best java teacher

[@thedarkwhisperingcloud]

Thanks 👍🏾

[@danielmilewski7659]

thanks!

[@bossowa315]

Yoo Man. Just got the idea from the video. Thanks.🙏

[@TheSoprah]

I played Pokémon when I was a kid
I played WoW when I was a teenager / young adult
I study Computer Science as an adult
I like this channel! :-)

[@vindydog7664]

Great youtuber

[@vpenywise]

Bros before codes! Good content!

[@eugenezuev7349]

as always, thanks

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Impressive!

[@meggieelo]

YOU ARE THE BEST

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Thanks 🌸

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thank you

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Thankss bro :)

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Nice content.

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nice video

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Cool I learn it

[@MrLoser-ks2xn]

Thanks

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awesome

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thanks

[@izaeljunior9007]

nice video bro

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ty bro

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Good

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Good video.

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All these prayers go towards my next job

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Love u Brother

[@alaric-bs3348]

Like and subscribed, thank for saving my assignment grade

[@noah77]

Good video.
BTW, can you make a small java game series or if not that then a video of making a cube in Java?

[@BroCodez]

I'm going to be dedicating videos #90-100 in this playlist to games and projects mostly. I believe we are on #86 right now

[@noah77]

*wow*! Thank you very very much!
But only one tutorial of making something 3D?

[@BroCodez]

I actually suck at 3D graphics lol
I'll brush up on my skills and see what I can do
no promises tho

[@noah77]

@@BroCodez thanks for your efforts

[@ahmadsan2907]

thank bro you literally saving my A$$ before exam

[@pouriahich4215]

🔥🔥🔥

[@praisethesun1]

wait i have to point something out real quick im pretty sure insted of using if or elseif statements couldnt of u just used a switch statement. great vid btw

[@kaushalprasadyadav9242]

Please make videos for mobile app development.....

[@eng6070]

Hey bro, I got a question when watching the video, what's the difference when creating the object using Animal type compared to using the specific type of Dog? Appreciate it if someone could answer this.

[@marcosa.6886]

‎La diferencia es que si usas Animal en lugar de Dog el texto que se muestra en la consola será "Animal goes *brrr* en lugar de "Dog goes *bark*!".‎

[@hannibalbianchi1466]

❤❤

[@be432n3]

long live bro

[@armandso1]

Hi Bro Code! okay, so I'm totally new to programming and been told to start with Java (something I'm still trying to understand why:)). Anyway, I do like your content but do have a question regarding this particular video. I guess I understand the concept and the logic behind this dynamic polymorphism thing but still having a hard time to understand exactly why and when I would use it. Here's the confusion in my head: Why can't I just use the following if/else statement to achieve the exact same goal:
------------------------------------------------------------------------------------------------------------------
if(choice==1) {
Dog dog = new Dog();
dog.speak();
}
else if(choice==2) {
Cat cat = new Cat();
cat.speak();
}
else {
Animal animal = new Animal();
System.out.println("That choice was invalid");
animal.speak();
}
------------------------------------------------------------------------------------------------------------------
So, I instantiate a dog object or cat object when and if I need it at runtime just as in the way you have done it. Can you or someone reading this message and who knows the exact answer, please reply to me and let me know because it is driving me nuts trying to figure out. I have been Googling this thing for the past 2 days straight and have not been able to find a detailed explanation as to why someone would do it the Bro way when it can also be done my way. I'm sure there's a very good reason which is why it was implemented in the first place but WHAT IS THAT REASON? :)

[@robinshere8697]

I think depending on the need ,we can code as per your wish

[@elzacontiero2770]

The whole point of the example is to show how polymorphism works. So, the video shows animal variable being assigned first to a dog, then a cat and a general animal. If you remove the polymorphism by making Dog and Cat not extend Animal your code would compile and work as intended whereas the example in this video would not compile.

[@equaliser19]

Animals go BRUHHH

[@bentameurmohammedayoub1464]

hi Bro why we don't use "Dog dog=new Dog();" and can we use switch statement in a place of "if Statement". thank you bro love the way you explain

[@agnivodas]

I don't know if this is the correct answer, but here's what I think: if you're working on a very big project, the dog and cat objects will have many methods which are common, like eat(), sleep(), move(), and many more. And if you create more subclasses like Horses and Squirrels and others, their objects will have these methods too. So instead of writing these methods repeatedly in these classes, you could just create them in the Animal class and have these classes inherit the methods from the Animal class. I think that's why we need the Animal class (to keep the methods which are common to all the subclasses) alongside the subclasses (to keep the methods which are more specific to the subclasses). What I mean to say is, if you do Dog dog=new Dog(), you won't inherit the methods from the Animal class, which will force you to write the common methods all over again. But if you do Animal animal=new Dog(), you'll inherit all the common methods from the Animal class, as well as getting the methods specific to the Dog class.
And yes, you can use a switch statement instead of an if block.

[@mustafaercan686]

Bro explained Factory pattern, without saying it's Factory pattern 👌

[@mariorossi1456]

What will you do after Java?

[@BroCodez]

Python and Javascript for a little while. almost there

[@lamias7712]

and that's that easy :D

[@Mohammed-tx1ok]

what is dynamic polymorphism, is it overiding?

[@BroCodez]

method overriding is an example of dynamic (runtime) polymorphism

[@fatihbasal6085]

i am helping you right now

[@fatihbasal6085]

becuse im fuckin loved it

[@chakmak]

where is the new videos?!

[@girl6994]

Good. But we should consider, if a Animal dog is treated as Animal, that is acceptable, but if that dog(which treated as Animal now) is treated as a cat, what exception will we get? I think we will learn that next.

[@shalajko]

I'm Finding this familiar.

[@alexyakoveno4682]

[@greeneggsandmushrooms9855]

polywhirl

[@UltraSolarGod]

1) Animal animal = new Dog/Cat();???
2) Animal animal = new animal();
can someone explain this to me how the 1st statement is true as its taking the data type from different class while declaing another class object ?? i know my question make no sense jus try to humor me
the only explanation i am think is the animal class is extend to both dog and cat so we can take the data from both the class

[@noisyguest5249]

Do u think python is better or java

[@meltdown6856]

If you learn Java, all the other languages seem much much easier. Cuz java is one of the languages with heavier syntax. So id recommend java for beginners.
Hope that helped :)

[@noisyguest5249]

@@meltdown6856 i started with python

[@BroCodez]

It's personal preference. I learned more about computer science and programming with Java, but Python is more convenient to use since there's less syntax. If you begin with Java and switch to Python later, Python should be very very easy to learn.

[@neuzen]

Why not just create Cat someCat = new Cat() or Dog someDog = new Dog() inside that if-else?

[@anjapietralla5767]

[@ashishthakur9983]

111

[@noisyguest5249]

Am i the only one to still use notepad lmao

[@noah77]

Download intellij

[@BroCodez]

hey if it works for you, why not

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k

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comment

[@ordanino9354]

Bro

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Thanks

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Thanks, Bro!

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Thanks

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