Java8 || Lambda Expression Functional Interface|| Session - 2 || On 31-07-2018 by Durga Sir

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The only lecture on KZbin which has best explanation of Java 8 features

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I was totally confused with functional interface and lamda expression but after watching this series now I am able to work on this

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Yes

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[@sumitcdac58]

Amazing explanation sir .....You made lambda very easy ..God bless you sir... You are a big asset for all java developer .Its truly amazing explanation.

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[@ankitmanmode5126]

100 % pakka valid

[@pankajpandey2882]

With normal interface method we define the implementation inside a class once .. like we do at service layer and then create object of the implementation class and call the method anytime any where . But looks like with lamba expression we need to implement the method everytime we want to use it

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No doubt sir... Such awesome explanation, easy 2 understand... Thnq sir 😇

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very good detailed explanation sir.......Your way of teaching makes in depth understanding of the concept. Thanks a lot...

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great explanations sir...very easily u explained..

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[@Mrparaselli]

Explanation about lambda expression in Java super sir. Thank U

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Yeah sir, a very long time ago I subscribed Durgasoft KZbin channel.

[@ujjawalranjan7579]

There was questioned asked at last about the performance. Since the compiler compiles once is not enough, we also have JIT in java which compile such common code at a time, so even compilation time is not much.

[@monikashekhawat743]

Firstly, Thanks very much for these amazing tutorials. One thought on using multiple abstract method inside a functional interface: we could have take multiple abstract method inside a functional interface with a condition that no two methods should have same number of arguments.

[@iamvardhanharsha1992reddy]

Method over loading is not possible because we are not specifying the type

[@jvsnyc]

No. If there are more than one abstract methods inside an interface, it is no longer a functional interface. You can have default and static methods as well, but only exactly ONE abstract method, no second or third ones, overloaded or not.

[@monikashekhawat743]

@@jvsnyc yes.. according to java it is not.. but we could have done that in functional interface to support more than one methods ..

[@monikashekhawat743]

@@iamvardhanharsha1992reddy no we can specify type

[@jvsnyc]

@@monikashekhawat743 Yes, but if you have more than one method in an interface it is not a Functional Interface == Single Abstract Method interface. You can get married, of course. But if you get married you stop being single.

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You are god sir

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Ultimate sir.. Great sir.. Please do provide more and more videos 👌

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your explanation is really awesome sir!!

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Dear Durga sir, Can I believe that all the subject (Java 8) you explained in these videos itself ? Do you explain more in regular classes ?

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Thank you sir.. Ur explanation is awesome. 🙂

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Thank you sir . I get my job thank you sir

[@Explorewithmishu]

Ques) In the below code B extends A where A is FI, that means B is also FI. then how m2 is allowed. because B will have two abstract interface right. m1 and m2 @FunctionalInterface Interface A{ public void m1(); } Interface B extends A { public void m2(); }

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super sir. ur explanation is the best.

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YOU ARE GOD FOR SOFTWARE ENGINEERS.

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Sir plz make video on hibernate and spring framework also

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For learning Java 8 which basic Java topics have to be learnt

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Thanks @Durga Sir#legend

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Thank you very much sir.

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Thank you so much sir!

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Thank you sir........................

[@pranjalgupta7527]

please sir, make the full course available to us on KZbin, I really request as you have been the only source of learning java for me ever since, I did java full and now started java8, but few sessions are not uploaded in between, kindly help sir

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[@furqansayed1137]

very amazing teaching

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where we can run java8. cant run in eclipce and notepad

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[@prakashbabugnanam7949]

Excellent explanation !

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Amazing explanation sir

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Wonderful course! Thank you Sir!

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world class explanation thank you

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Perfect Teacher :)

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Excellent 👏!!!!!

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YOU ARE AWESOME SIR

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[@jayareddy9980]

Sir you are really great !!! A great tutor

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[@sandeepchikkala5010]

Thank u sir 🙏

[@yashadattadeo]

Awesome video Sir, thanks a lot! One question which you might have covered in other videos...what if the method has different data types for the method ? like add(int a, double d) ? Thanks

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[@gaurav16413]

Hi Deo, In such case we need to Typecast explicitly (a,b) ->(int) (a+b); Below is sample @FunctionalInterface interface MyInteface { public int add (int a, double b); } public class MyDemo { public static void main(String[] args) { MyInteface myInterface = (a,b) ->(int) (a+b); myInterface.add(10,20.0); System.out.println(" The total of a and b is"+myInterface.add(10,20.0)); } }

[@nr0913]

Great session

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[@pankajverma2393]

Hi Durga sir, I very much enjoyed this video. I have a doubt. If we have somewhat bigger implementation of the method of functional interface (around 50 lines of code...assume), then how we can achieve it ? Only by applying curly braces around the implementation in lambda expression ? It would be great if you can explain it with an example. Thanks :)

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[@shashaankkumar8337]

The logic for the method implementation would be the same.

[@veerendrak1001]

@@shashaankkumar8337 bro have you java 8

[@jvsnyc]

I hope you haven't been writing any lambda expressions even close to this large!! As Venkat Subramanian says "Lambdas should always be cute and small!". Maybe give it a name and use method references, at the call site. Better for testing that way too.

[@sridharreddy5656]

tnq so much sir

[@tharsantharsan416]

1:07:03 anyone remember that vadivel fish joke

[@bhavanikasiviswanathan3707]

haha.. parthiban and vadivel "meen kadai" joke. Durga sir is "god of java".

[@rockbrand753]

salute sir...

[@VinothKumar-lt6bu]

interface inter{ public void m1(); } Java 7: ------- Class Demo implementes Inter{ public void m1(){ // 100 lines of code here System.out.println("m1 executed"); } } Class Test { public static void main(String args[]){ Inter i = new Demo(); i.m1(); } } Java 8: ----------- Case 1: ------- Class Test1 { public static void main(String args[]){ Inter i = ()-> { // 100 lines of code here System.out.println("m1 executed"); } } } Case 2: ------ Class Test2 { public static void main(String args[]){ Inter i = ()-> { // 100 lines of code here System.out.println("m1 executed"); } } } ---------------- My Comments : ---------------- Here I have a query ? As you said , if we are using lambda our code will get less. As per above example, I am going to implements the interface in Test1 & Test2, Then I need to write the 100 lines of code in both the implementation.right ? But if we are using Java 7 , then we no need to give the implementation in both the class right ??

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[@suminshakya5067]

how can i get a premium videos

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[@rupeshsingh4016]

is it compulsory to learn multithreading before learning lambda expression

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[@jvsnyc]

No, but some of his videos in this series (at least one) will be confusing if you don't.

[@music_rishi6646]

Why invalid or can you explain sir?? I'm little bit confuse can you please elaborate what wrong in this approach? Class Demo{ public static void main(String... Arg){ Interf3 k2= s-> s.length(); System.out.println(k2.length("Rambha")); } } interface Interf2 { public int length(String s); } interface Interf3 extends Interf2 { default int length(String s) { return s.length(); } }

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[@music_rishi6646]

Ok

[@ashkathaker8877]

Hi Sir, without new key word or static method how jvm give memory to this lambda expression(I mean method logic what we wrote in main method)?

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[@javainterviewquestionsshaa3401]

If I have default method in FI then I can invoke this method using lambda exprn?

[@krishnashauzshenikala9240]

No

[@subhashgauda875]

Cool Tutorial ....

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[@subhashgauda875]

@@DurgaSoftwareSolutions Durga sir it is showing but after 15 number onwards it is display something like private video

[@punitdwivedi7232]

Sir, you provided notes in your core java classes i.e collection, multithreading and oops concepts etc. by speaking but here we are missing your face and notes.

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[@punitdwivedi7232]

Sir, i want java 8 features notes

[@AspirantNoteBooks]

Amazing

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[@FAITH__2025]

Can we write non- static methods ...? In functional interface

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[@rahulramanan14]

Hi sir I am having one doubt in this suppose I am having following in interface Interface interf { public void add(int a,int b); public void product ( int c, int d) } For this also we can't able to write lambda expression?

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[@mukundvinayak6786]

rahul bhai here we have two abstract methods add() and product, lambda works only for SAM- single abstract method.

[@jvsnyc]

There are "off the shelf ones" that you could use for each method individually. We don't pack multiple methods into an interface used for lambda expressions in Java.

[@BharathKumarEnishetty]

56:08

[@ipsitasahoo3921]

but sir,in this case,for every functionality we have to create different interface because FI can contain only one Abstract method. Then this way also code will b more.

[@pushyamitra2252]

The lamda expression will be used in cases where we generally use a class to implement an interface containing a single abstract method. By using lamda expression, we infact decreasing the code, otherwise we need to implement the method.

[@BihariStation]

Without using abstact keyword can we consider it as an abstract method??

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Hello Akshay. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@iamvardhanharsha1992reddy]

Methods in interface are by default public abstract

[@rocklee7574]

Anybody please help me error: incompatible types: FunctionalInterface cannot be converted to Annotation @FunctionalInterface ^ 1 error this is is show in function interafce i write the same code as in video

[@DurgaSoftwareSolutions]

Hello Friend. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@rocklee7574]

@@DurgaSoftwareSolutions thankyou

[@heenaqawi8997]

👍

[@Drazziq4317]

how can we get these notes ..

[@DurgaSoftwareSolutions]

Hello Lootera. For Java 1.8 ntoes, Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@AbhishekPandey-mi1wi]

Write one for yourself

[@hrishabhkesarwani8060]

1.11.00

[@hrishabhkesarwani8060]

53.50

[@VikasKumar-wh2om]

is anonymous function concept exist before java 8 ?

[@DurgaSoftwareSolutions]

Hello Vikas. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@AbdulAziz-lo9ob]

Yes

[@jvsnyc]

Not in Java!

[@nadeempasha3280]

How can we debug the implementation of functional interface?

[@DurgaSoftwareSolutions]

Hello Nadeem Pasha. Plz contact our online team [e-mail] or call us on this number +918885252627,7207212427/28

[@jvsnyc]

Some prefer to put it into a named method which is tested separately and then use method reference (::)

[@sumitcdac58]

Amazing explanation sir .....You made lambda very easy ..God bless you sir... You are a big asset for all java developer .Its truly amazing explanation.

[@DurgaSoftwareSolutions]

Hello Sumit. Thanks for your valuable feedback. It will boost us to do new things. Please subscribe to get updates about new videos. You can view all other Java 1.8 New Feature Videos by Durga sir in the following link: goo.gl/ujVNJH

[@RaviKumar-cw1vl]

Thankyou so much sir.

[@abhinav9469]

Thanks a lot sir...