Modern Java in Action
Вставка
- Опубліковано 8 бер 2024
- Let's write a GitHub Crawler and let's throw in everything Java (21) has to offer:
◦ virtual threads and structured concurrency,
◦ pattern matching and data-oriented programming,
◦ type inference, records, and sealed types,
◦ text blocks and template strings,
◦ a modern HTTP client and improved collections,
◦ modules and OS-specific binaries.
The end result will look very different from just a few years ago, let alone 10. This is not your dad's Java!
Presented by Nicolai Parlog (Oracle)
Recorded at Jfokus 2024 ➱ www.jfokus.se
◦ Inside.java ➱ inside.java
◦ Dev.java ➱ dev.java
Tags: #Java #JDK #OpenJDK - Наука та технологія
My favorite language has elegant and easy-to-understand code. The only thing I think could be added to this beautiful language is deterministic memory management, so I can use it for systems as well. I love Java.
+1
𝌲 Java changed my life 25 years ago. Today there are more choices than back then but Java still rocks.
You can manage memory just like in C with sun.misc.Unsafe
@@rogerdinhelm4671 I'm talking about something like Mojo, Swift, Rust, NIM 2.0, with a memory management system called ORC.
@@rogerdinhelm4671 I'm talking about memory management in the style of MOJO, Rust, Swift or NIM 2.0, the latter has memory management with destructors and movement semantics inspired by Rust and C++. Java is the best, but for systems deterministic memory management is required.
20:00 I would be interested in a dedicated video to these reflection capabilities.
Great talk/presentation, showing a lot of the new features in a connected way while also giving some additional information about them and their usages/options/capabilites/benefits!
That dedicated video is not a bad idea, I'll put it on the list. 😊 If you want to look into it yourself, check out Class::getRecordComponents: docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Class.html#getRecordComponents()
Great, thanks!
Thank you!
Thanks Nicolai, Great Talk as expected.
Thank you!
Great video! Thanks, Nicolai!
Banger video, love coding sessions like this. Keep it up!
Good talk Nicolai, love the frequent uploads on the channel.
KUDOS! Awesome presentation! and remarkable job from the Java team!
Please guys, bring the null check with ? and something similar to elvis operator to the lenguage!
awesome
30:42 - RIP string templates
Great talk! Loved the structured concurrency bit, pattern matching (blew my mind a few times in the talk with how awesome the code looks with it), string templates and other new features overall. Java 21 has really upped it's game in terms of neat tricks that make the life easier.
i used ktor for that exact purpose. i feel like, oracle took a lot of inspiration from kotlin.
good job, friend
great!
36:04 Pretty.pageList -> what if page is null? Should we put additional check for that?
You can just add a `case null ->` to the switch if you want to handle that case. Otherwise the switch will throw a NullPointerException.
12:10 `git eradicate`?
I'll have to look up the exact alias, but what it does is revert all changes and delete all untracked files.
@@nipafx Oh, right, an alias. 🤦
nice viewo
Great talk!
Editor - looking at Nicolai is cool and all, but you need to keep showing the code or we can't follow along.
I agree! But the video was edited live at Jfokus (for their live stream) as you see it here and we don't have access to the original source files to re-edit. 🫤
Super lovely, thanks! But "abusive," indeed :) Imagine handling a new type of GH page... How many switch-es were there?
That's not the abusive part, though. 😉 If every switch were instead a method on `Page`, adding a new type of pages requires you to implement all operations. If `Page` used the visitor pattern, adding a new type of pages requires you to update all visitors (i.e. operations). Here, adding a new type of pages requires you to update all switches (i.e. operations). There's no escape from this (unless you want some operations to execute a default action for all new types that are ever added).
Fair enough :)
Haa... Java
I have 1yr of experience as a java developer..after i see this video makes me think i am a joke 🤡
Don't think that. A year of experience is a great point to be productive and to really start to understand the language and its ecosystem. Stick with it! And keep in mind that the talk was prepared and rehearsed with the express goal to make the code look good.
Everyone has to start somewhere! One thing about programming is that there is always more to learn ⭐
Thankyou guys it means a lot ♥️
@@nipafx Hello, Nicolai. You could consider taking the JAVA team to open a project to research a deterministic memory management system to be used by developers who need low memory consumption and develop real-time systems. I have seen some languages that have adopted deterministic memory management, such as MOJO, Rust, Swift, and NIM. Nim, for example, adopts a system called ORC. It's just that some of us didn't want to have to leave this wonderful JAVA ecosystem for any other language, not even temporarily to make system-level applications.
@@nipafx I just started learning Java seriously a week ago and this lowkey gives me hope 😹
These highly professional people have no concept of quality screencasts, do they? The wastage of time in Java community is like no other. Untangling complexities too remains elusive.
The string interpolation is still super ugly and should be replaced and yes I read the explanation for this incredibly unpractical and ugly design in the jep. It's not just a "small amount of convenience" that we're missing out on.
records immutable = bad
copyOf just to make immutable list = bad
we had better solutions for all of this long time ago
Could you please tell us what, you think, is better?
@@avalagum7957 sure, records forcing you immutability is bad because for most it means boilerplate code, shit performance (no resue from cpu caches after you mutate) lots of garbage (which is less of a problem, cos gcs are very good these days)...
what they should have done is give you options, if you want immutable declare your fields as val or var like kotlin...
immutability is very niche technique that mostly library devs should use not general public... good example is string, more good examples? hard to come by
@@avalagum7957 copyOF sucks, because it actually will copy unless underlying was immutable already... instead kotlin solved it better yet again... List = Immutable version, no mutator methods, MutalbeList = MutableVersion....
You can simply return List even though underlying is mutable (so you do a free downcast)... and if a developer goes out of his way to cast it back to mutable and mutate it then its his problem...
Again they are lazy and dont do the work even though jetbrains showed them years ago how its done properly.
@@avalagum7957 if records were some sort of C type data structures packed in memory i would understand immutability, because you cannot predict length of some fields to count pointers... but all it does is forces you to use immutable pojos... why tf would you force it, i dont know...
My only guess is laziness + since they are in the a cloud provider club, they do not want you to write efficient software that does more with less...
This code looks like shit, and i didnt watch further.
As a java dev it pisses me off that they make short sighted decisions to hit their 6 month schedule, even when good tested solutions to these problems are already out there for many years.
@@krellinyou're right, records force immutability. But isn't that what they were created for?
If you want to modify your classes everytime, then records are clearly not what you should use.
If the jvm works like any other language though, anything that's immutable should help the compiler make more optimization.
val and var isn't the good example you think it is. They could have used literally any other names that didn't look so identical.
If I remember Kotlin correctly, its concept of immutability is also similar to java in that the reference is still mutable. So val in Kotlin, is really just final in java.
why intellij? eclipse is better for java
😂😂😂
😆😆Hell nahh
The choice of IDE doesn't matter bro
Eclipse is better than Intellij? You must be from another planet to believe that.
@@meilyn22 no, why? i like the workspace concept in eclipse more. also the content assist and hovers are much better. also intellij is not building incrementally, making it slow if i run the program. because it then starts compiling. when i delete a method, the other class which is not open and where the usage of the method is, will not be marked red in the file explorer. this is really unacceptable. intellij is for beginners imo.