Kotlin Newbie to Pro - ANONYMOUS CLASSES - Part 26

[@dmgujjar6044]

This is the best programming tutorial of my career since 2014!!

[@srr1424]

Thank u philipp for the best and awesome series. I am one of your subscriber.

[@mariuszmilewski2084]

I'm not a programmer, but I like to play with programming from time to time. Kotlin this time. So far your lessons are the best I've found.👍👍 I grew up on functions and still can't understand what classes give :), but maybe someday...

[@lukalukovic5082]

Philipp is really good, because of him I landed a job as an android developer at only 18 years old. I recommend you stick to him if you want to become an android developer, and good luck in your future endeavours

[@Luffy_2804]

@@lukalukovic5082 how much time did it take to learn android dev?

[@userglls]

@@lukalukovic5082 I've been learnin kotlin from that playlist. I'll become an android dev in future (I'm 15)

[@s.predator536]

Wow this is series is so good🔥

[@ekkawutemeelugsana7068]

Hi Philipp Lackner, I have a question about this Anonymous classes because with this example I would prefer to create a new class that Inherit from Shape. for S.O.L.I.D Principle, So I don't have to touch the Shape class anymore. class Parallelogram(private val a: Double, private val b: Double, private val height : Double) : Shape("Parallelogram"){ override val area: Double = a * height override val perimeter: Double = 2 * a + 2 * b fun isRectangle() = height == b } Could you give me another and more clear example about when to use Anonymous classes and why?

[@sumeet21587]

You are not touching the Shape class and modifying it. It is just creating an instance of an anonymous class that inherits the Shape class with the use of an object keyword. The use case would be in a code base where you want the Shape class concrete implementation to be in one place. I hope I was able to explain!

[@mohammednashat6707]

احسن واحد ف الكون 😉

[@thomasgeorge4578]

These videos are really good 🔥🔥

[@PhilippLackner]

Thanks! :)

[@numeshdilusha8106]

Pill can you mention the real life use case as well it would be grate for new students !

[@pikaboyny]

How common would you say Anonymous classes are used in implementations of Kotlin like Android Development? It looks like it's very useful but I feel like it's not good coding conventions? I don't know, I'm transitioning from Java so it's weird to have so much more flexibility in a language like Kotlin lol

[@PhilippLackner]

It's very commonly used. You also have it in Java (for example if you do something like new Interface{...})

[@kevinsolanki6232]

This is strange.. really strange..I didn't get it... So as you said first...When we need implementation of class with slight modification but we don't want to create completely new class for and this case we can create anonymous class. So..which class is anonymous !?...Okay we got only one class here..so does that mean Shape class is anonymous class !?..and where implemented modification !?

[@PhilippLackner]

The anonymous class is what you create with object : Shape

[@kevinsolanki6232]

I completely ignored object keyword🤦🤦🤦. Now I know why there was quiz question on website that whether "object" keyword we use in anonymous class is different than the "object" keyword we use in companion object. So, now we can do whatever we want in this object: Shape class because it is anonymous. Thanks bro🙏✨🌈

[@asimlatif360]

Great Explanation!

[@jayjan_py]

Me learning this concept and knowing I am never going to use this in real life. 😭😭

[@zepra2133]

is other language have anonymus class like this?

[@filip_g]

AMAZING!

[@AniobiStanley]

val base1 = 4.0 val base2 = 6.0 val side1 = 3.0 val side2 = 5.0 val height = 2.0 val trapezium = object : Shape("Trapezium", base2, base1, side2, side1){ init { println("Created a $name with sides: $side1, $side2, $base1, $base2. Area of the $name is ${area()}. Perimeter of the $name is ${perimeter()}.") } override fun area(): Double = 0.5 * height * (base2 + base1) override fun perimeter(): Double = base1 + base2 + side1 + side2 fun isRectangle() = side2 == side1 } println("Is the ${trapezium.name} a rectangle? - ${trapezium.isRectangle()}.")

[@jonievillejo6746]

// :) I hope I understand well that you meant to say was a Trapezoid. Just created the main here. fun main() { val base1 = 3.0 val base2 = 11.0 val leg1 = 8.0 val leg2 = 10.0 val height = 7.0 val trapezoid = object : ShapeAssignment26("Trapeze", base1, base2, leg1, leg2, height) { init { println("Trapeze created with base1 = $base1, base2 = $base2, leg1 = $leg1, leg2 = $leg2 and height = $height") println("The area is ${area()}") println("The perimeter is ${perimeter()}") } override fun area(): Double { return height * ((base1 + base2) / 2) } override fun perimeter(): Double { return (base1 + base2 + leg1 + leg2) } fun isRectangle(): Boolean = ((leg1 == height) && (leg2 == height)) } println("Is the Trapeze a rectangle? ${trapezoid.isRectangle()}") }