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We are a Community full of Java developers. Connect with other devs, get help, help others and do much more!

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❓︱qotw-answers

rotesherz

9/28/2025

redhat openjdk problem

please i need help i cannot figure out why i cant run a java file even though i have redhat openjdk installed on my linux

𝓖𝓾𝓻𝔀𝓲𝟑𝟎

9/27/2025

Create ErrorLens like plugin for IntelliJ

I wanted to create a ErrorLens (VSC Plugin) like plugin in IntelliJ, because every already available plugin is really slow and isn't customizable enough. But im not able to find any docs about how to do it and i can't really understand the already available plugins src because they are written in scala and im tring to write them in Java.

valer

9/27/2025

Lambda Expression

Guys I had a question regarding lambda expressions in Java, when the abstract method from the functional interface requires a parameter, is the parameter not mandatory to be inputted in the code block you pass into the abstract method?

𝒫𝓇𝒾𝓃𝒸ℯ𝓈𝓈 ♡

9/27/2025

Eclipse

I’m trying to install Eclipse, but this happens when I click on the app

SockyKun~ ;3

9/26/2025

Creating a QR based attendance system

Basically I want to make a cross platform wifi and Bluetooth based attendance system which generates a session ID and a random Qr code which contains the teachers wifi and Bluetooth connection requirements and marks the attendance

Lukas

9/25/2025

Map.get() Behaviour for objects with an equals() override

So my object is basically a few variables, which I compare in an equals() overridden method. When I my map contains an object like { myvar = 1; othervar = "Hello"; yetanother= 12.4f } and I map.get(new MyObject(1, "Hello", 12.4f) with an unrelated but content wise identical object, would it get the entry for the original object?...

Asdru

9/25/2025

Basic firebase login app with google that uses compose 2.0.0+

It there a template somewhere? i even looked at the android tutorial repo and theirs is outdated

Shano

9/25/2025

I just started Java and i already need help cuz im watching a tutorial and i cant write my first cod

Carnage

9/23/2025

I need help with this step

Lianecx

9/23/2025

Hotswapping with JBR and HotSwapAgent

hey, im trying to install the jetbrain runtime in a docker container along with hotswap agent. I am running on an arm ubuntu machine and tried the aarch JBR releases JCEF (fastdebug) and JBRSDK. I put the hotswap-agent.jar in lib/hotswap and i still get the error Unrecognized VM option 'AllowEnhancedClassRedefinition', im using java 21...

Ban Chinese & Korean dog eating

9/22/2025

**Need help for API 35 problem build problem in Unity game engine:**

I am trying to build my completed demo to the Play Store for Internal Testing. I am trying to do a aab build to my laptop to then Upload to the Google PlayStore for Internal Testing. My download keeps crashing to my laptop. The Console have these 4 errors in the screenshots (below) I downloaded Java-11 in the screenshot (below)...

obesgap

9/22/2025

What do you use for web programming nowadays?

I have been into pure Java back-end programming for years, and I'm a bit lost of what is used nowadays to web server/html programming. In my days, I used JSP and then some frameworks like GWT and Apache Wicket. But if today I should begin with a new project, I don't know which tecnology to use......

Craftingbear8

9/21/2025

Anyone

can anyone pls make me a free minecraft client dm me if yes.

Ban Chinese & Korean dog eating

9/20/2025

Unity Java JDK build problem

I am building a game in unity Anyone in this server familiar with Gradle builds in unity Or Java JDK-11 for Unity builds to the play store?🤔 My unity aab build keeps crashing to my Laptop....

valer

9/18/2025

Math Related Question for A Program

Anyone able to explain how getting sin and cos would work when it comes to circles?

CHECK MY STATUS PLEASE

9/18/2025

Trouble with linking to lwjgl using gradle

hi so i come from C# and Silk.net and i primarily make game engines and im giving lwjgl a chance since i heard its better but i really cant seem to get my build system to work. this is apparently correct for linking it but i get an error saying that nothing can be found and i dont understand it

𐌋okesh

9/16/2025

learning multi-threading

1. (in java) is theading and multi-threading the same thing or not? like maybe threading used in context of single-cpu and mul... 2. what's exactly is "concurrency", "multi-threading" and "parallelism" (in java), and which of them does java true supports? 3. the linked image is from this book "learning java an introduction to real world programming" (latest edition). IDGI. we always do that, that's how we do everything right? You have to extend "Thread()" (I'm currently learning about association, aggregation, composition techniques to achieve different levels of coupling but yeah, they may be other cases how to design your classes and interfaces relation but.. leave it)....

Dathrun

9/15/2025

whats the best place to start to learn coding

so like should we watch a 40 min video on yt or use a specific applications to start since whatever ive done, i have learnt like nothing:1105happycat: so please tell me

b2aDev

9/14/2025

Spring Boot question

I have a two part question that is slightly related. What is the best way to work with method params Using IDS...

Polar

9/14/2025

How to delete list length - n amount of minimums from a DLL

//The new DoubleLL should have the n largest nodes in the SAME ORDER as the original SingleLL ` public static DoubleLL TopNodes(SingleLL list, int n) throws Exception {...

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Java Community | Help. Code. Learn.

We are a Community full of Java developers. Connect with other devs, get help, help others and do much more!

Java Community | Help. Code. Learn.

We are a Community full of Java developers. Connect with other devs, get help, help others and do much more!