Java 21 API New Features

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Learn about the many enhancements that Java 21 is giving you in the classes you are using every day.
Java 21 is introducing several major new features: virtual threads and pattern matching. But it also brings new many small additions to classes that you are using every day, and that you can leverage from day one. This video covers the most important ones: the String class, regular expressions, the Collections framework, some additions in Java I/O, the Math class, and, as a bonus some important deprecations you need to be aware of.
⎯⎯⎯⎯⎯⎯ Chapters ⎯⎯⎯⎯⎯⎯
0:00 Intro
1:18 New methods on String, Character, StringBuilder and StringBuffer
2:34 Naming your capturing groups in regular expressions
4:01 Additions to the Collections framework
6:22 Localization in the Date and Time API
6:53 Additions to the Java I/O API
7:49 Using AutoCloseable with HttpClient, ExecutorService, and ForkJoinPool
9:29 Additions to the Math class
11:25 Multiplying BigIntegers in parallel
12:00 Additions to the Thread class
13:25 Additions to the Future interface
14:45 Deprecation of finalize()
15:42 Deprecation of the constructors of the wrapper classes
16:20 Outro
⎯⎯⎯⎯⎯⎯ Resources ⎯⎯⎯⎯⎯⎯
◦ Full #RoadTo21 Playlist ➱ • Road to 21
◦ Java 21 New Feature: Virtual Threads ➱ • Java 21 new feature: V...
◦ Java 21 New Feature: Sequenced Collections - JEP Cafe #19 ➱ • Java 21 New Feature: S...
◦ The JEP 444: Virtual Threads ➱ openjdk.org/jeps/444
◦ The JEP 431: Sequenced Collections ➱ openjdk.org/jeps/431
Tags: #Java #Java21 #Tools #OpenJDK

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Опубликовано:

27 июл 2024

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Комментарии : 82

@java 10 месяцев назад

We got 2:34 wrong. Named groups in regular expressions are supported since Java 7. What's new (in 20) is that the methods related to named groups moved up the dependency tree from `Matcher` to the interface `MatchResult`.

@zoladkow 9 месяцев назад

no worries, everyone here knows the vids are just about coffee sipping with some words inbetween 😁

@brandpcalderon5343 6 месяцев назад

i was going to complain the same, named groups are allowed since I learnt regex like 3 years ago and more I suppose

@OzoneGrif 4 месяца назад

Yeah I was really confused about this. Was going to comment the same thing. Brain fart !

@onebeartoe 10 месяцев назад

Thanks! I cant wait for the named String groupings to help parse flat files.

@OriginGaming101 13 дней назад

Came here for Java, stayed for their use of my favourite local cafe in the background! 😂

@Talaria.School 10 месяцев назад

Great topics I had to comment and thumbs up. Thanks a lot José.

@JosePaumard 10 месяцев назад

Thank you Khaled!

@boyneverstop 10 месяцев назад

Thank you for making this video! Very useful

@JosePaumard 10 месяцев назад

Thank you!

@YvesDautremay 10 месяцев назад

Thanks for the overview ! A few nice things that may be shadowed by virtual threads

@JosePaumard 10 месяцев назад

Thank you!

@svalyavasvalyava9867 10 месяцев назад

Awesome video, thank you ☺️

@codeZarathustra 10 месяцев назад

Good explanation Sr! Thank very much!

@JosePaumard 10 месяцев назад

Thank you!

@ajaythombare6235 10 месяцев назад

thank you for valuable information sir... btw I like ur coffee cup

@nO_d3N1AL 10 месяцев назад

Really appreciate this format of doing updates. Also a cool idea: the amount of coffee left in the cup should match the progress of the video ;) Also thankful that new APIs and methods aren't using checked exceptions! 🎉

@JosePaumard 10 месяцев назад

Well it does ;) This is real coffee that I drink during the recording.

@nO_d3N1AL 10 месяцев назад

@@JosePaumard Cool! I bet it's actual Java coffee too ;)

@JosePaumard 10 месяцев назад

@@nO_d3N1AL Oh yes it is! 😊

@1gmar 10 месяцев назад

Apologies, isn't the feature mentioned at 2:34 already available since Java 7?

@mikolajpodbielski 10 месяцев назад

Yes, it is.

@christofferhammarstrom 10 месяцев назад

What is new in Java 20 though, is that MatchResult now supports named groups. Perhaps there was a mixup here.

@JosePaumard 10 месяцев назад

You're absolutely right. What has been done in 20 is that the methods are now available on MatchResult (interface implemented by the Matcher class), along with some others. I should have mentionned namedGroup() also.

@ahmadfx8962 10 месяцев назад

رائع

@radoandrey2268 10 месяцев назад

Thank you

@computer_science10 8 месяцев назад

thank you

@si2001si 6 месяцев назад

Hi Jose, Big Fan!! Your Coffee looks yum

@rishiraj2548 Месяц назад

Thanks

@jeromemainaud 3 месяца назад

3:59 With large patterns in a multiline string, instead of using backslashes you can also use the COMMENT flag. This will be more readable.

@mortensen117 10 месяцев назад

So, named groups, which arrived in Java SE 7, is now suddenly something new? If you could write the name of the group in some meaningfull way without of a lot a string gymnastics, then there would be some thing new.

@JosePaumard 10 месяцев назад

What is new is that the methods are now also on the interface.

@hephestos300 4 месяца назад

after what JDK will be the whole lambda as was introduced in JDK8 deprecated and ousted ? Can't wait the moment

@edmaphis9805 10 месяцев назад

Emoji methods !! Holy smokes !!

@ClydeXT 9 месяцев назад

In your example at 7:15, your types should be "byte[]" instead if "int[]"

@zoladkow 9 месяцев назад

ahh... certainly too much coffee 🙃

@TheNeoxpert 10 месяцев назад

08:44 close() method will be called no matter what? what if there is System.exit(0); in the try block?

@JosePaumard 10 месяцев назад

Nope, not in that case. If what you need is to kill your JVM as fast as possible, taking the time to execute all your close(), finalize(), etc... would probably be a mistake,

@RishiRajxtrim 12 дней назад

🎉

@Speiger 10 месяцев назад

IMO the state enum is missing something. "CREATED" or "UNSTARTED", because there is no way to track if a task was already started or not. Which is useful if you have a queue of tasks that are expensive and you want to cut basically anything that isn't started yet, and you didn't expose the Queue itself. Unless state returns null if it isn't started yet, then i take that back.

@pravinjain2834 10 месяцев назад

I fully agree, currently it seems they put the state as RUNNING as soon as the task is submitted. probably it is being thought that since we can have virtual threads, the number of threads in the pool will be more and no task will be waiting to get started. but for tasks which are computative (no blocking activity), one may not like to use virtual threads. In any case you are right, that state has been missed.

@oifbert 2 месяца назад

What's new about pattern matching? Named groups have existed for years.

@danthe1st 10 месяцев назад

Shouldn't it be "Charset" instead of "CharSet" in 7:09?

@muzzletov 10 месяцев назад

CharSet is just short for Character Set. So, no, it shouldnt.But yes, the class is called Charset, which feels wrong :D

@danthe1st 10 месяцев назад

@@muzzletov If the JDK calls it Charset, it is Charset and not CharSet. And honestly, I would consider charset to be its own (atomic) word and (at least in the context of Java,) it isn't really a set of characters.

@JosePaumard 10 месяцев назад

It should. Thank you for pointing it out!

@edmaphis9805 10 месяцев назад

So Autoclosable is a functional interface?

@JosePaumard 10 месяцев назад

It is. I'm not sure that it will be very useful to implement it with a lambda though...

@edmaphis9805 10 месяцев назад

Ok. class Closer { static void closing(Closeable closeable) throws Exception { System.out.println("Now closing: " + closeable.toString()); closeable.close(); } } class AClosable implements AutoCloseable { @Override public void close() throws Exception { System.out.println("I am closing"); } } public class CloseableDemo { public static void main(String[] args) throws Exception { var aclosable = new AClosable(); Closer.closing(() -> { try { aclosable.close(); } catch (Exception ex) { } }); } }

@edmaphis9805 10 месяцев назад

@@JosePaumard Thanks, I tried anyhow. 😉

@JosePaumard 10 месяцев назад

@@edmaphis9805I'm not sure I would use this pattern in a real application 😉

@akaalkripal5724 10 месяцев назад

How's the coffee?

@JorgetePanete 10 месяцев назад

I think close() should be called automatically when the object is no longer needed

@SourabhBhat 10 месяцев назад

Wouldn't that cause the same problems as finalize?

@JorgetePanete 10 месяцев назад

@@SourabhBhat At least if it's called at the end of the scope of the object I think there wouldn't be problems

@alessandroautiero5414 10 месяцев назад

@@JorgetePanetein a method's scope that's probably easy enough (GoLang has the defer keyword for this use case pretty much), but how would you do it in the case of a field? It would have the same problems as the finalize method I'm pretty sure.

@JorgetePanete 10 месяцев назад

@@alessandroautiero5414 I don't know, I just wish it was like Rust does

@mattidragon835 10 месяцев назад

@@JorgetePanete the reason rust can automatically close is it's strict borrowing and moving rules. In java you can move objects freely and rely on the GC to clean them up

@zenmony-dot-com7457 10 месяцев назад

Pleasant coffee lounge atmosphere, perfect for learning.

@JoshuaMuzaaya 7 месяцев назад

wow, all these have been in Erlang/OTP, Python, Elixir right at those languages' first version.

@sneibarg 10 месяцев назад

Naming capture groups is a super old feature of Python.

@Parkhill57 10 месяцев назад

piano in background still drives me crazy.

@kitkarson4226 10 месяцев назад

Why do they pollute Character class with emoji methods 🤮? They could have made it as a separate util class .

@pravinjain2834 10 месяцев назад

Yes, there could be a separate class for all the Unicode properties. There are still a lot of unicode properties not available in Java API (Character class).

@nicholas1460 10 месяцев назад

You used var. Shame on you.

@JosePaumard 10 месяцев назад

Oh no, I love var.

@nicholas1460 10 месяцев назад

@@JosePaumard var var var var. Just for you. Quess what objects I'm using.

@JosePaumard 10 месяцев назад

@@nicholas1460 You don't need to use it everywhere. But there are still many places where it will make your code more readable.

@kitkarson4226 10 месяцев назад

var is a great addition to java. I have been using for couple years now,

@khmarbaise 10 месяцев назад

var often shows that the variables names used are not good enough to transport the information. That lets me reconsider my names and make it better (hopefully ;-))

@mortensen117 10 месяцев назад

AutoCloseable? Why are you presenting these OLD features as if they were new? Are you crazy?

@kitkarson4226 10 месяцев назад

Watch it one more time. AutoCloseable is OLD. But now ExecutorService, HttpClient..etc also implement the interface. Thats what he says!

@JosePaumard 10 месяцев назад

It's not because it's old that it's not useful. With the deprecation of finalize(), AutoCloseable becomes more important. Thus the new classes that implement it. Keeping repeating old stuff is not a problem for me.