7:00 lambda 7:26 backward compatibility of Java 8:18 9:34 why Java 8 is backed by single abstract method interfaces (@FunctionalInterface) 9:47 if an interface is single abstract method interface, you can use lambdas instead of anonymous inner classes 11:47 how does it work under the hood 12:49 illusion aobut lambda - syntax sugar, i.e. on the instruciton level, it is the same as anonymous inner class 14:16 what lambda does under the hood 14:47 what would the compiler be doing with lots of lambda (assumption only) * 18:16 why it is not a good idea for lambdas to create extra classes like anonymous inner classes 19:14 a new feature since Java 7 - instruction - invokedynamic 20:53 in Java 8 struggling with the elimination of anonymous inner classes 21:00 the motivation: use invokedynamic to implement lambda expressions 25:16 example 29:18 internal iterator 39:00 method reference 44:28 avoid the urge of writing a large lambda expression - an anti-pattern 44:54 what are method references 45:41 examples of method references 47:15 static method reference 49:31 parameter as a target map(String::toString) 54:58 2 arguments * 56:23 the order of the arguments are important 57:38 another example - first parameter is the target, second parameter is the argument 59:33 limitations of method reference 1:08:00 filter 1:19:30 second part 1:29:07 stream is an abstraction 1:29:12 a stream is not a physical object with data 1:29:24 a stream is a bunch of functions you will evaluate eventually. There is no data sitting in a stream 1:29:48 a stream is a non mutating pipeline - stream is not mutating the data in a collection 1:30:31 stream functions 1:33:11 transforming function - Stream.map 1:37:25 Stream.reduce() 1:43:47 InStream/DoubleStream.sum() - also a reduction operation 1:44:08 what is reduce operation - transform a collection into a concrete value or object 1:44:51 another reduce operation - collection 1:45:45 a wrong approach to do collect 1:47:00 explanation of the wrong code 1:47:18 shared mutability is devil 1:49:04 use Collectors.collect 1:51:17 Collectors.toMap 1:54:17 groupingBy 1:54:38 example 1:57:40 another example with mapping() method 1:59:37 performance 2:05:40 Q: How much work? 2:09:30 streams are LAZY 2:10:49 intermediate operations are postponed for evaluation 2:13:00 important * 2:15:43 * 2:16:15 2:17:37 demo for performance analysis 2:19:36 lazy evaluations are only performed when the terminal operation is triggered 2:27:08 intermediate operation - Stream.sorted()
finally, someone intelligent and articulate enough with great dynamic working examples explains lambda and double colon. thank you. after much searching its finally clear to me. ☺
Venkat was my professor at UH for my last year in computer science. He is by far the BEST computer sceince professor I have ever had. I learned more from him in one semester than I did from when I started coding in highschool.
34:49 "And for the first time, in a long time, Java is finally intelligent" that was the moment I lost it. This guy has such a talent of explaining stuff!
superioriginality = qualities.reduce(blessing, (feature, excellency) -> feature.add(excellency)); Dr. Subramaniam rocks as ever. Thank you for another great session !
One of my new favorite speakers ever. It's all gold, but the motivational parts especially, even tho the technical details are all spot on and valuable. Like 1:02 thru 1:05, not strictly technical, but extremely important in terms of WHY we need to modernize our Java style....
I just can't express how glad I am to land here. He has explained java 8 features with so much depth and conviction. Venkat sir just knows the features inside out and he is in love with Java. ❤
Like this talk and the way of communicating some of the design philosophies. Not just what can be done.. but also the why and how of it is covered here.
Really an awesome talk,the way you explained with real time examples and jokes is really superb. You made Lambda and Stream learning so easier. Pleasure to saw your teaching and Gonna see all your talks in you tube. One of the best java talk ever ! Thank you so much Venkat
I just love that editor and how intelligent that thing is! Venkat should do just one nice session on that editor setup. That would help the community so much :)
Wow! Great explaination of Lambda and Streams. His explaination and examples are so concise and easy to understand that I've ever seen. Very very thanks !!
Indeed a great talk on lambdas and streams. If you have been coding in java for a year or more , then you could even watch it at 1.75x without losing on any info
Nice explanation sir... Very informative.. I would say I have never attend any tech show.. Where someone explained like this during my entire career.. Lol now I got it what was missed in my eduction. 😕😕
Hi venkat, I referred so many author's to understand java8 features, but some how I got ur video in the list. I just looked into it, it was just awesome. Thank you for ur efforts
"When you have 9 million programmers using your language and out of which 1 million programmers know where you live you have to decide things differently." :D
I created an IntelliJ plugin which provides similar functionality which outputs the result of a Java main execution as a tooltip. The plugin can be found here: plugins.jetbrains.com/plugin/8543?pr=idea
"If a language does not support backward compatibility, it is DOOMED; we also know if a language supports backward compatibility it's also DOOMED!... and so it's a question really choosing which way you like to be DOOMED!" LMAO!
At 33:10 - Doubt: What about beyond-imperative-rather-functional-internal-java8-iterators (put simply, internal iterators), and resource-sharing/concurrency, on the list object on which forEach is invoked,, by another thread, using the same 'numbers' list?
While explaining the time taken by for loop in finding the value of even number greater than 3 and multiplying the same by 2, Venkat explained as if the for loop goes through all the values before giving the result. The explanation of men in black T shirt, white shoes etc., strengthen this impression. As someone, mentioned a break statement at the end of the for loop as soon as the required number is found, then the for loop will stop functioning. No doubt writing a stream function is easier and clearer than writing a for loop. For loop does take more time than the stream, no doubt, but the explanation needs modification.
7:00 lambda
7:26 backward compatibility of Java
8:18
9:34 why Java 8 is backed by single abstract method interfaces (@FunctionalInterface)
9:47 if an interface is single abstract method interface, you can use lambdas instead of anonymous inner classes
11:47 how does it work under the hood
12:49 illusion aobut lambda - syntax sugar, i.e. on the instruciton level, it is the same as anonymous inner class
14:16 what lambda does under the hood
14:47 what would the compiler be doing with lots of lambda (assumption only)
* 18:16 why it is not a good idea for lambdas to create extra classes like anonymous inner classes
19:14 a new feature since Java 7 - instruction - invokedynamic
20:53 in Java 8 struggling with the elimination of anonymous inner classes
21:00 the motivation: use invokedynamic to implement lambda expressions
25:16 example
29:18 internal iterator
39:00 method reference
44:28 avoid the urge of writing a large lambda expression - an anti-pattern
44:54 what are method references
45:41 examples of method references
47:15 static method reference
49:31 parameter as a target map(String::toString)
54:58 2 arguments
* 56:23 the order of the arguments are important
57:38 another example - first parameter is the target, second parameter is the argument
59:33 limitations of method reference
1:08:00 filter
1:19:30 second part
1:29:07 stream is an abstraction
1:29:12 a stream is not a physical object with data
1:29:24 a stream is a bunch of functions you will evaluate eventually. There is no data sitting in a stream
1:29:48 a stream is a non mutating pipeline - stream is not mutating the data in a collection
1:30:31 stream functions
1:33:11 transforming function - Stream.map
1:37:25 Stream.reduce()
1:43:47 InStream/DoubleStream.sum() - also a reduction operation
1:44:08 what is reduce operation - transform a collection into a concrete value or object
1:44:51 another reduce operation - collection
1:45:45 a wrong approach to do collect
1:47:00 explanation of the wrong code
1:47:18 shared mutability is devil
1:49:04 use Collectors.collect
1:51:17 Collectors.toMap
1:54:17 groupingBy
1:54:38 example
1:57:40 another example with mapping() method
1:59:37 performance
2:05:40 Q: How much work?
2:09:30 streams are LAZY
2:10:49 intermediate operations are postponed for evaluation
2:13:00 important
* 2:15:43
* 2:16:15
2:17:37 demo for performance analysis
2:19:36 lazy evaluations are only performed when the terminal operation is triggered
2:27:08 intermediate operation - Stream.sorted()
Awesome toc 👍☺
Very informative and well explained, thank you.
You probably made it for yourself, didn't you ;)
@@infitium7246 yes, i have bad memory, so jot it down make me remember better :)
Hats off!
Venkat is not just really knowledgeable but he knows how tell and express concept in the way even a kid could understand . Thanks .
2w
@@veenasharma2440 from india?
@@udaykiran557 from india?
@@satishsatyan3520 Yes
@@udaykiran557 .
One of the best java talks ever seen.
Very informative.
短短的看到哦的哦地盘耳畔网片 W_PP_W_PE_PE_PE_PD
agree
The best java talk I've ever seen
me too...:)
.
Same here
finally, someone intelligent and articulate enough with great dynamic working examples explains lambda and double colon. thank you. after much searching its finally clear to me. ☺
youtube rocks
Venkat was my professor at UH for my last year in computer science. He is by far the BEST computer sceince professor I have ever had. I learned more from him in one semester than I did from when I started coding in highschool.
I have been converted to functional style programming using Lamdas and Streams thanks to Venkat.
Double thumbs up!
1:02:40-1:05 the heart of programming! Great talk!
Best!
This guy speaks very well. Usually indian guys are hard to understand. This guy is awesome!
The best speaker I've ever heard. I am delighted
This is hands down the best Java conference evere made
Well he said you came here for Lambda but stayed here for stream but I got addicted to Venkat. Amazing speaker. Thank you.
This is how you explain advanced stuff in simple way. Tell me why i should bother to use a new feature. Amazing.
34:49 "And for the first time, in a long time, Java is finally intelligent" that was the moment I lost it. This guy has such a talent of explaining stuff!
Love his enthusiasm and his crisp and clear explanation.
superioriginality = qualities.reduce(blessing, (feature, excellency) -> feature.add(excellency)); Dr. Subramaniam rocks as ever. Thank you for another great session !
One of my new favorite speakers ever. It's all gold, but the motivational parts especially, even tho the technical details are all spot on and valuable. Like 1:02 thru 1:05, not strictly technical, but extremely important in terms of WHY we need to modernize our Java style....
I just can't express how glad I am to land here. He has explained java 8 features with so much depth and conviction. Venkat sir just knows the features inside out and he is in love with Java. ❤
Really amazing. I am a big fan of Venkat. His book "Functional Programming in Java" is also a must read for all Java Developers.
Thanks for comment, I needed some book as a guide.
One of the best java talks I have ever scene that even a beginner can understand it...
Like this talk and the way of communicating some of the design philosophies. Not just what can be done.. but also the why and how of it is covered here.
What a great speaker.
Just watched 24 mins and gave my like to the video. What a speaker, cheers!!! -)
What a great talk, Venkat gave the best explanation about streams I've seen, and I've seen quite a few so far.
Cant believe i just listen through the whole video...
He is brilliant teacher
I'm fortunate to watch this video! Speechless.. Absolutely recommended for people like me who didn't know the potentials of lambdas and streams.
Really an awesome talk,the way you explained with real time examples and jokes is really superb. You made Lambda and Stream learning so easier. Pleasure to saw your teaching and Gonna see all your talks in you tube. One of the best java talk ever ! Thank you so much Venkat
Buddy, I caught you here. I even like the talk. best ever java talk
This is one of the best videos that I saw about Streams and Lambdas!!
he is best at explaining things...became fan of him.
I just love that editor and how intelligent that thing is! Venkat should do just one nice session on that editor setup. That would help the community so much :)
Did you find that already?
@@kpvenkatesan Its TextMate
I sincerely wish I could like this video more than once. Simply brilliant
A rare species : someone who can do tech, can talk and also keep you engaged for a full 3 hours.
your one of the best teacher I have seen till now..
I had come to see this video to brush my knowlege. I ended up learning many new things. excellent explaination
Fantastic presentation! What a great speaker! One of the best presentations that I've watched.
This guy is a great speaker! Thanks for the awesome talk.
Great talk, very informative for those who are starting to work on java 8. Awesome explanation.
Wow! Great explaination of Lambda and Streams. His explaination and examples are so concise and easy to understand that I've ever seen. Very very thanks !!
His pace of explanation is perfectly suitable for me
As the title says, I addicted to Stream; But I addicted to your lectures more than it. Thanks Venkat, it was really helpful.
GREAT!!!! so many details! so many examples! awesome! thank you a lot!
"A person who uses all the tools are called consultants" (1:05) - hahaha, you made my day sir!
Thanks a lot for such a informative talk.. watched entire 2:47 hours
Been 6 years and it's still useful :)
Claps for your passion for programming especially for your comments at 1:00
Indeed a great talk on lambdas and streams. If you have been coding in java for a year or more , then you could even watch it at 1.75x without losing on any info
Brilliant. Best value for 2 hours spend watching the video
Venkat is an awesome teacher! Thanks a lot for sharing!
He is amazing!! Best Java talk ever
Nice explanation sir... Very informative.. I would say I have never attend any tech show.. Where someone explained like this during my entire career.. Lol now I got it what was missed in my eduction. 😕😕
Indians are awesome! thanks, Venkat sir.
Wow, not sure why I didn't use of java 8 functional style until now. Great talk
think new session required to introduce ide 😁, very impressed. thanks a lot
Hi venkat, I referred so many author's to understand java8 features, but some how I got ur video in the list. I just looked into it, it was just awesome. Thank you for ur efforts
This man is really good at talking and explaining
Finest explanation on streams. Thank you very much!
Amazing lecture on functional programming. The best I ever heard!
Awesome. Excellent presentation. I wish I have seen this earlier. Recommend.
"When you have 9 million programmers using your language and out of which 1 million programmers know where you live you have to decide things differently." :D
HEX D
I created an IntelliJ plugin which provides similar functionality which outputs the result of a Java main execution as a tooltip. The plugin can be found here: plugins.jetbrains.com/plugin/8543?pr=idea
Brilliant analogy !!!, I wish I could give Super Like or more likes to this talk :-)
Really like the part with the performance analysis, most video about FP stop on the declarative part and don't go further.
Thanks Sir, you got my like
just came to learn lambda.... never had a blast before learning programming concepts
"If a language does not support backward compatibility, it is DOOMED; we also know if a language supports backward compatibility it's also DOOMED!... and so it's a question really choosing which way you like to be DOOMED!"
LMAO!
There's a lot of crap in his talk apart from the actual content, which wastes my time. I am better off reading a book than watching his talk.
Just upgrade and move on.
make your nuts tight!
Venkat is brilliant. Indian minds are like gods.
its about perceiving and realizing. Not blind mugging.
Great explanation with great examples... Thank u for giving me the imp of lambda & stream.
Its really a very good talk!!! The way concepts presented helps understanding it from the core.. Great job sir.
Awesome sessions. Java made easy and interesting. Excellent speech.
Am binge-watching presentations by Venkat.
Thank you so much, Venkat!!!
Thank you. It is such informative video and I really love the way you present it.
one of my favorite features was "replace lambda with method reference", until i started watching this videos
The Best java talks i have ever seen...
gc() those unlikers...
What entertaining educational talk, thoroughly enjoyed!
1:15:48 "If you gonna take so long and suck , you would rather suck quickly." Lol 😂.. man that was damn hilarious..
Venkat , you are simply amazing.. Great talk!
This video is gold.!
Great Job!!!!
1:06:00 One of the best explainations
He's so awesome, thanks for the talk!
how to speak about a boring thing in a very brilliant way ... and in white socks ... amazing !
Venkat is really becoming my code hero
Really finding it very interesting and glued.
Content and the way it is explained is nice. Thank you.
And with no shoes ... love u bro !!!
At 33:10 - Doubt: What about beyond-imperative-rather-functional-internal-java8-iterators (put simply, internal iterators), and resource-sharing/concurrency, on the list object on which forEach is invoked,, by another thread, using the same 'numbers' list?
Best Talk Heard Yet!
Thanks a lot this man is competent,
Small mistake on 1:43:00 the first param of reduce is actually R not T. the same as return type.
One of the best java talks!!
Awesome presentation. Truly gifted at explaining concepts
Awesome explanation, wondering about people who disliked this video
Amazing explanation. I ever scene this kind explanation
While explaining the time taken by for loop in finding the value of even number greater than 3 and multiplying the same by 2, Venkat explained as if the for loop goes through all the values before giving the result. The explanation of men in black T shirt, white shoes etc., strengthen this impression. As someone, mentioned a break statement at the end of the for loop as soon as the required number is found, then the for loop will stop functioning. No doubt writing a stream function is easier and clearer than writing a for loop. For loop does take more time than the stream, no doubt, but the explanation needs modification.
Very Consuming.Awesome video
Does anyone know what he is using to display the result of his code in those little pop up boxes?
+1
Great job Mr. Subramaniam !
This presentation was magnificent !
Wonderful speaker.. amazing analogies
You are a Rockstar, period.
Awesome Explanation Sir. Thank you so much
Lovely talks. the best moment is 34:55 LOL . thank you Venkat
Very dynamic person!!