Generics in Java
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- Опубликовано: 1 дек 2016
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In a nutshell, generics enable types (classes and interfaces) to be parameters when defining classes, interfaces and methods.
Much like the more familiar formal parameters used in method declarations, type parameters provide a way for you to re-use the same code with different inputs.
The difference is that the inputs to formal parameters are values, while the inputs to type parameters are types.
Code that uses generics has many benefits over non-generic code:
- Stronger type checks at compile time.
A Java compiler applies strong type checking to generic code and issues errors if the code violates type safety.
Fixing compile-time errors is easier than fixing runtime errors, which can be difficult to find.
- Elimination of casts.
- Enabling programmers to implement generic algorithms.
By using generics, programmers can implement generic algorithms that work on collections of different types, can be customized, and are type safe and easier to read.
In this video we will see :
- What is Generics
- What is Type-safe Language
- How to achieve type safety
- An example or program of Generics implementation in Java
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Sir in this lockdown I have learned a lot in programming just because of you. Thank you so much
Very straight-forward and easy to understand. Thanks for the content!
he explained it in very simple manner now i understand this concept hope he will upload more complex way to define generic
Thank you so much! I've been looking all over the internet for this and none of them were as good and straightforward as this! Thank You SO MUCH!
Best Java channel. Straightforward explanation, with code live demonstrated. You are sure to learn just by watching this. I learned from you in Spring Boot, REST services, and Java core APIs. Thank you so much!
Telesko is good but I would like you to check Java Brains channel of Kaushik, your view might change
7:35 mind blown; thank you for this video
The beauty of java is that before solving clients problem you have to solve java problems.
your title music is damn scary if you have seen haunted on discovery channel
Read this as I was thinking the same thing. I'm dying over hear with that into music. LOL
as scary as generics in java
@@cori2852 :))))))
This guy is awesome, he really likes teaching which is highly appreciate it.
Thank you so much, it's very easy to understand!
Great video, now I understand the concept. Thanks a lot!
I was always confused with "? extends ..." & "? super ...." but now it is clear to me. Thanks Navin Sir.
Thank you so much Bro for your explanation. Your video resolved many of my confusion that even my lecturer was not able to solve coz she did not understand my confusion. Generics is much more clear now for me.
Awesome bro... Best Video I ever saw for Generics... Thanx man.
This is the single most important video if you want to be clear about Generics...Thank you!!
Another great video that helped me with understanding my school homework. Thank you sir.
I knew about Telusko from its inception but never liked or followed. But after seeing this one single lecture. Hands down never judge a book by its cover
Really nice explaination. Thanks for all the details!
This really is the best video on Generics, I love it!
Thanks lot... for exact concept of java & all telusko videos to teach all technologies
100% explained ! Knowledge necessary for heavy solutions. Thank you. Keep on.
u have some enormous talent sir...plz continue this job..all the best
Thank You, your lesson helped me a lot!
Good leason.
I was easily able to understand the generics.
Thanks.
Thank you so much, your generics explanation is awesome.
Well explained. Thank you very much
lucid explanation. I have been watching ur videos for quite a while now. Thanks Navin Reddy. ur amazing.
Very detailed explanation. THANK YOU!!!!
You are simply awesome Navin
many many thanks ... superb video
in method definition of public void demo(ArrayList
The best explanation for Generics and Collection interface and Collections classes
Even I m non it student, I m getting this concept clearly
Thanks to telusko🙏👍
Thank You Sir🙏🏻. You taught it very well .
I can't understand this in my class but here I've cleared all of my confusions in one shot ❤❤❤❤
Thank u sir ❤❤
clear explanation , thanks mate.
Now this was a good video. You didn't cut it too short and leave out some of the nuances like others do. Now i'ma go lookup that ? thing and Super.
This man is great I wish you a healthy and happy life and thanks for sharing.
Awesome Video I have ever seen ,
in short
in 5 min
Complete
Compaq
concise and clear, thanks
such a awesome video. I loved it.
Excellent!! Thank you very much indeed. .
need help confusion on following declaration why ..
1) class CalendarDate implements Comparable (when we implement Comparable we write in the end )
2) class OrderPair implements Pair .... (in user define interface we write after Class can somebody explain it)
Thanks a ton Navin. You are the best!
Thank you!! Excellent explanation :)
great explanation, thanks.
Great method of teaching.
Thank You Navin, BIG Help!
Naveen sir your presentation is simple and understandable
Love the way you say "Dabl" & "GettaSetta" :D
9:05 when he laughed?
This helped, thanks :)
You are really great my friend, tank you for your videos
thank you so much for this!
Entities have different type of class. Student class, employee class. Thanks i need to populate data from database as List
Hello sir! I need to know which subclass is sorted hashMap Or hashTable... ???
In case of....
Map m= new HashMap(); or HashTable() ;
Its similar to temlate in C++. They changed template to generics
Thank you for this well made explanation
sir how to do that you have done at 10:49 to see which class/interface extends which class
when i do that in eclipse by holding control something different shows up "source not found
"
Bhai Mere mazza aa gya yaar
excellent video!!!!
It's clear, thank you.
What if I want to use everything related to T (aka, both the supers and subclasses of T and also T itself?)
BEST ever
It was good but please discuss about generic method and uses of generics in combination with reflection
Just asking, but what is the point of adding getters and setters in the class Container? From what I have tested so far, everything worked fine without those..
Everything worked fine without those because getter and setter for value were not used/called anywhere in the code.
Point for adding those was just to show how generics works.
For example, if you made object obj, like in the video:
Container obj = new Container();
and you want to set value for it:
obj.setValue("Java");
then compiler will know that T is String,
public void setValue(T value); ----> public void setValue(String value);
WOW that was a great video!
Hi Telusko,
Could you please tell us how to access the java provided classes like List.class and Float.class. I use Eclipse as well but haven't figured it out yet.
While doing so I am getting the following error:
The JAR file C:\Program File\Java\jre1.8.0_201\lib
t.jar has no source attachment.
Amazing content!!
I dont know why, but i am not being able to jump to implementation of any java inbuilt classes?
Any help!
Excellent!!!!!
Great video. Thank you so much.
Could you tell me how to access the java proviced classes like List.class and Float.class. I use Eclipse as well but haven't figured it out yet.
Do you mean: How do you go to the implementation of List? Just right click --> Go To --> Implementation (or [Ctrl]+[Alt]+[B]).
Excellent Video
its good that such people do exist.#ilovetelusko
great explanation
Well Explained
very helpful tnx a lot
Nice vid man!
Nice explanation
Thanks, bro. :-)
sir in Hash map can we enter only key and values or we can enter one key no of values (like = sid,sname,address and phone )
thank you. It was effective
what if I want to use student class eg: Container obj=new Container(); how will i write my student class then? i am confused
what's T extends Comparable ?
Great video
Really good tutorial
Hello anna! just want to know about something which I encountered while I was coding my own Collections(say linkedList). So, I used and everything was working fine, however, when I tried to write a method for finding minimum in Linkedlist, compiler keeps throwing errors(as finding minimum wouldn't be possible if the type were (T=)String. So, I want just this method to accept Integer or any Number values and whenever the type doesn't fit it should neglect it. How can I do so?
U r awsm sir😍😍
why LIST interface methods are not asked to be implemented? rather its optional
but when we create a new interface and add some methods, they need to be used mandatorily.
Thanks I love it 🤝
very good thanks
Thanks boss!!
The error at 3:37 is about Integer.parse() and not the List.add
Can you show a real example of using super keyword? I understood that it is used as constraint for concrete type, but when and where I should use it?
Use '? super T‘ whenever you want to indicate a type which is a super-type of 'T'.
Good one.
Good Video :)
sir will u please provide the practical session videos
Sir, well explained. But as I was also a student , from that point of view I can say that , this is the very basic concept of generics. It will be really great if you make some videos on 'errasure and generics'. I think this is the most confusing part of generics. If you could explain that in easy way, the way you have been doing, it would be very beneficial for students out there.....
Thank you sir 🤠
what is the differenes of list< T > with list< ? > ?
list -> where T can be any fixed type and which is entered by you as a programmer and than it can not be changes in the middle
list -> this is wild card, which can be anything. usually used when you dont know whats going to come up
Always Awesome ❤️