Java 8 groupingBy | groupingBy In Streams |Java Shastra
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- เผยแพร่เมื่อ 5 ก.ย. 2024
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📌groupingBy() is a static method available in java.util.stream.Collectors. Which is used to grouping the objects on the basis of any key and then it returns a Collector.
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0:10 - Introduction
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Basically, he wanted to Group Rashmi and himself together :P . Smooth af bro.
It's really helpful
excellent tutorial on groupingBy
Thank you for encouraging words .
I was searching for this tutorial all over the internet, but there comes you then with so simplicity.
Thank you for your encouraging feedback, will motivate me todo more such stuffs . 😊
Really, best explanation for learners
Thank you. Appreciate your comment. Please do subscribe .
Best video on this topic till date, big thanks to you, request you to please make video on internals of spring-boot as well, like @EnableAutoConfiguration, or why do we need a main method in a spring-boot-app, please if you can, will be very helpful for beginners
Sure , thank you for your feedback 😊
Thanks Brother❤ finally i understood grouping by method.
Appreciate your comment 😊
Very good video brother. Because of you I cleared an interview in a very good MNC company. My well wishes with you. Thanks.
Congratulations 🎉 for your success . it’s good to hear from you .
The video is indeed helpful. Please upload more
Clever explanation
Clear explanation Bro...Thanks ..
Happy to help
It takes more time to figure out the grouping, method, etc than to actually declare a map of type, iterate over the list and add them to map.
True
Your explanation style is truly good. Thanks for this video.
Thank you for your encouraging words .😊
It is very useful and explained as very very simple great work bro👏
Thanks
Nice explanation.
Hello Sir, It's One of the Best Explained concepts on Grouping by.Thank you
Very good
Very very nicely explain
Good video, it would be better if you Improve your English pronnunciation bro, just a constructive critic. Happy Coding!!
Excellent bro i am searching for this code
Thank you 😊
nice explanation dude...
can you plz do a example for flattening concept for below collection
Map map=new HashMap();
to do different operations on Employee object
Sure will do .
👍👍👍
❤
Thanks
Great !! regards
What does he mean by reduction operation? Like toSet and toMap? Change the defualt list return type by groupingBy method?
Can you explain how we can group by who has 80 in marks?
Good explanation, keep it up 👍
Very nicely explained
Thank you 😊
Oh, so you are the 25 year old Rashmi, that he has grouped himself together with. :clap:
Nice explanation. Can you also share tutorial on different Map implementations ?
Hashmap, linkedhasmap, treemap you are talking about ??
@@JavaShastra yes and there are many more .
how to find sum of the salary is greater 5000 of each department????
deptList.stream()
.collect(groupingBy(Department::getDeptName, summingInt(Department::getSalary)));
I thing this is what you are looking for. Thanks!
@@Tikeswarib How to find frequency of each word having frequency >1
Whats marks?? Int array? Like scores?
Nice 👍…what happens if i do groupby using name and name has a null value??
I will try and let u know 😊
we can not have null as key in the result , so will get the exception as : Exception in thread "main" java.lang.NullPointerException: element cannot be mapped to a null key
Git hub repo link....can you provide