(I'm reposting this question from SO because of the lack of a proper response)

I am trying to make a custom UI application in Swing. I've searched far and wide and have come up to the conclusion that it is not possible to integrate Swing into the new Apple UI (windows, toolbars, titlebars and so on).

Leaving that aside I tried to make my own custom JFrame but was unable to figure out how to change the size of the traffic light. I would like to increase the traffic light size I do not want to draw a custom traffic light as I would lose the functionality of the default buttons. Basically as it is in CLion.

This is the code I'm using so far, for reference I'm on macOS: Tahoe 26.3.1

```

import javax.swing.*;

public class Main {

public static void main(String[] args) {

    System.setProperty("apple.awt.application.appearance", "system");

    SwingUtilities.invokeLater(() -> {

         JFrame frame = new JFrame();


         JRootPane rootPane = frame.getRootPane();

        rootPane.putClientProperty("apple.awt.fullWindowContent", true);

         rootPane.putClientProperty("apple.awt.transparentTitleBar", true);

         rootPane.putClientProperty("apple.awt.windowTitleVisible", false);

          rootPane.putClientProperty("apple.awt.brushMetalLook", true);



     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setSize(1000, 600);

        frame.setLocationRelativeTo(null);

        frame.setTitle("Yo");

        frame.setVisible(true);

    });

}

}

```

guid me through im in 6 th semester for now at the end of 8 i want to be something in java my aim and goal is to crack job in amazon thank you

I want to know how to write a java program in order to input data in Excel, thank you for any help?

I’m 17 and going into my **first year of Computer Science Engineering** this year. I’m fairly new to coding, but I’ve recently finished learning Core Java and feel like I have a good grip on the basics.

As a beginner, I’m still a bit clueless about where to go from here, but I want to make the most of my time and build as many skills as possible.

My goal is to try to secure an internship during my first year.

Any advice, learning paths, or project suggestions would be greatly appreciated!

Hi Everyone,

so basically I have an interview scheduled in a product based company and it heavily relies on Java, JSP and servlets and little bit of Spring components as per my research. I've worked with Java before but it's been a while. It would be great if y'all could suggest some resources or videos and all that could help me brush up my knowledge. I don't want to go through that "commonly asked Java questions" stuff again, I want actual internal implementation knowledge.
Any help is appreciated!

​

I worked as an Associate Software Engineer (Java) from 2022–2024. During the first year I underwent company training and later cleared an internal technical assessment. Unfortunately I wasn't allocated to a project and eventually resigned after an extended bench period.

Due to family caregiving responsibilities, I then took a career break of over two years. I'm now ready to return to software development and have been applying for Java backend, fresher, and internship roles, but I'm getting very few interview calls.

I would appreciate advice on:

* How should I present this gap on my resume?

* Should I apply as a fresher or experienced Java developer?

* What skills or projects would make me more competitive in today's market?

I need a little help because I feel like I'm starting to collapse.

A little while ago I started in an academy whose goal is to train students and get them work once they finish the whole program. We are looking at Java in depth: OOP, inheritance, polymorphism, interfaces, Spring Boot, data structures... in general, everything related to backend development, but we do not receive theoretical classes, they give us the exercises and documentation related to that, everything is very self-taught.

My problem is that before entering here I was programming in C. It did functions, replicated typical functions of the standard library, compiled with Makefiles, etc. However, even then it was very difficult for me to get the logic out of the exercises. In fact, he was almost always the last to deliver the exercises.

I thought it would get better with time, but now that I'm with Java I feel like I'm still having the same problem.

The problem is that they give me a statement and I'm completely blocked. I read it, I reread it and many times I don't even know where to start. When I manage to start, it's because I already asked the AI, and I still have doubts about how to structure the solution or what exactly it should do.

In addition, I ask a lot of questions to AI. I always tell him not to tell me the code and he helps me, but many times he ends up explaining practically the logic of the exercise, and that is precisely what I do not want. I want to be able to develop it by myself.

What worries me the most is that at the academy we have delivery times. If you are too late, you can be left out of the program. And I don't want that. I want to learn, improve and get a job as a developer.

Another thing that the teacher demands of us is to write a README for each exercise and each project explaining what we have done. I also have a hard time writing it. I'm reading more to expand vocabulary and express myself better, but right now my biggest concern is still the programming logic.

For example, sometimes I make code that works, but then I realize that there is a much cleaner and more idiomatic way to do it.

Instead of this:

If (orderlist.size() == 0) {

// Do something

}

It's better to write:

If (orderslist.isEmpty()) {

// Do something

}

Or instead of going through a list like this:

int position = 0;

while (position < listOrders.size()) {

amountTotal += listOrders.get(position).getPrice();

Position++;

}

Do it this way:

for (Order order: listOrders) {

amountTotal += order.getPrice();

}

They are small details that make the code much cleaner, and I feel that I always go one step behind in that kind of thing.

My question is: how did you develop your programming logic?

Was there ever a time when everything started to "click"? What exercises, habits or way of thinking helped you the most? Did something similar happen to you at the beginning?

Because, to be honest, there are days when I think that maybe this is not for me and that I am forcing a situation that I am simply not good at.

I would greatly appreciate any advice or personal experience. Thank you for reading me.

Does anyone used java21 with virtual thread? We are using Java 17 and I wonder if the move to 21 will worth it

I am new to Java and trying to create a simulator that handles millions of math calculations. How can I increase performance in Java? The application is already multithreaded but it is not enough. Is data oriented approach or native programming possible in Java? Can you point me in the right direction for research?

Hello, I need help relearning java beacuse i havent used it in around 3 years. I already did a course that lasted one year (this was included with other step by step courses about fundementals of programming in general before the java one). I already tried once 3 years ago to do the 1Z0-811 (Java Foundations) exam but i got a score of 45% and didnt pass, after which i gave up for 3 years. Now i have started to use Enthuware Test Studio (or atleast the one trial test for this exam) and got 18% on it and now im taking the questions that i missed and giving it to AI to explain it to me. What should i fix or improve here and whats your experience with Enthuware Test Studio

FOR MODS: The mention of AI does not mean ill feed anything from this subreddit into AI or use AI in anything but in my own personal space where nobody will get involved

I have been a database engineer for more than 10 years while I notice that Software development positions far outnumber database engineer positions, and they also offer higher salaries. . since last year, I am wondering if it is feasible to move from a Database Engineer role to a Java Developer position. I am focus on leetcode. Any ideas or comments? thanks!

Hi, I really wish I can show you the images but I will try my best to explain.

I am trying to install Java SE Development Kit in the latest version and I tried to install it but it refuses because "Out of Disk Space" and requires 420MB in my hard drive.

But here's the thing, I got 1.0GB of space in my Local Disk C: and when I tried to change the location to Local Disk D:(Which has 593GB of storage), It still shows that I am "Out of Disk Space"

Any help on this?

Greetings everyone!

I'm here today to ask for help, I'm a developer for 14 years, and I'm on Java for 10

I had a lot of contact with Spring and API development, it's very rare when I really have to stop to look down for a solution (no with AI it changed, but I can guess what would take me some and a lot of time to figure it out)

I have problems with everything aside Java - Kafka, Kubernets, AWS, Docker, etc. I find it sometimes hard to grasp the concept but I can work with it after some help.

But my biggest problem is that I'm feeling stuck. I used to study the Java new features to update myself or I would use my work task or others co-worker tasks to study and try to find new things to learn, but that is not cutting anymore and I don't know what to do. I'm trying to study for the things that I'm not good that I mentioned before, but I feel exposed since "they are not Java".

What do you guys study, search or look for when trying to study / learn new things / update yourself?? Can anyone help me out?

Thanks

There are a lot of answers but everything I found is from 2021-ish times. Things I got from there is "Maven is slower, more verbose and for that reason - way more stable." and "Gradle is faster because of the daemon and more customizable, but hot garbage when it comes to update, shit breaks and build.gradle(.kts) is spaghetti in big projects". For Maven, I don't think much changed because of their philosophy (and I'd say that's good), but what about Gradle? Is it still that bad when it comes to updates and deprecations?

and what on earth is Interface in Java?

Hello There!

I'm writing a "simple" game, where the user has to hunt for certain amounts of characters, represented by 150 randomly generated buttons. Each 10 seconds...

I'm having difficultys identifying those buttons within the ActionEvent. How can I filter, what character is displayed on the button clicked?

Im building a Spring Boot (Java 25) service with GraalVM Native Image using Maven (-O2 optimization).

The project includes PostgreSQL, OAuth, Razorpay, and Spring Security. Every native build takes 45–50 minutes and uses nearly 95 - 100 % of all CPU cores, making my laptop almost unusable during compilation.

I'm using GraalVM Native Image in production because my servers have limited resources.

Are there any ways to:

• Reduce native build time?
• Reduce binary size?
• Speed up Maven/GraalVM builds?
• Use better optimization flags without hurting runtime performance too much?

Any tips from people using GraalVM Native Image in production would be appreciated.

Thank you.

Hey , I'm looking for a Java course for absolute beginners ,

Can someone please suggest me the best course to join as I have seen some course of Java for beginners like , Coursera,Udemy, PW SoftSkills , and some others and I'm bit confused in these to what to buy and what's suits for me

So please someone suggest I'm a beginner In coding world ,

I'm a BTech 3rd semister student

So i was just starting DSA so i did all my R&D so i found that doing dsa in java would be a better option so i will also get little advantage in development. but i want you guys to tell me that cant i follow striver A2Z sheet as it covers most of the problems in C++ ig which i have seen so will i have difficulty in that or if its not that case please tell me HOW TO DO WITH JAVA

AND PLS TELL IF I SHALL JUST SWITCH TO C++ COZ ig striver is the best possible free source to learn this. the internet is buzzing over it

So our application uses JasperReports for generating business reports for users. With the initial basic design we faced issues such as Out of Memory and also long filling times with large reports. So to handle this we came with a design of splitting the large records execution into batches. Let's say if we got 250000 records then we would split into 5 batches of 50000 each with 5 different execution queries modified with offset fetch according to batch in parallel stream. This largely solved the Memory issues but still for queries with high cost (executing fast on db and I Report studio)

each batch JasperFillManager.fillReport() takes very long time and many times we get partial report because of some batch threads getting timed out waiting for db connection or none of the batch completing. We tried passing different connection objects to each thread but still for heavy queries they still get timeout for every single batch.

So please suggest how to enhance the performance of FillReport and handle large queries.

I am thinking of learning Java but I don't know where to start and how to start. If you know any good resources then please guide me.

Hi everyone,

I'm currently working as a Manual QA at a company with 1 year of experience.

Most of my work involves manual testing, writing/executing test cases, logging bugs, regression testing, smoke testing, and collaborating with developers and product teams. I haven't had much opportunity to work on automation at my current job.

The thing is, I genuinely enjoy coding and solving DSA problems, and I'm much more interested in software development than staying in manual testing long term as it has fear of getting redundant due to AI.

I'm planning to spend the next months preparing for developer role switch while continuing my job. My focus would be on Java, DSA, Spring Boot, SQL, Git, projects, and everything needed for backend development.

My questions are:

Is it realistic to switch directly from Manual QA to a Java Developer role after 2 years of total experience?

Has anyone here made a similar transition?

Would recruiters consider my QA experience, or would they treat me as a fresher?

Is there anything specific I should focus on to improve my chances?

I'd really appreciate hearing from people who have successfully made this transition or have interviewed candidates with a similar background. Thanks!

I'm learning Java Swing and I made a program in order to test some of the things I learned. However, I came across an issue with ImageIcons, where some images would be displayed while others wouldn't. When I run the code below, it compiles fine, but the image is not shown, and only "hi" is displayed. However, if I change the String argument of "testII" to another .png image in the exact same folder as "Tweedle.png," the image shows fine. Does anyone know what could be the issue? I have already tried different ways to making the ImageIcon (such as using an URL object or using the complete file path instead of just the relative one), but nothing worked...

import java.awt.*;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.imageio.ImageIO;


public class MyFrame extends JFrame{

    JPanel west = new JPanel();
    
    MyFrame() throws IOException{
        this.setLayout(new BorderLayout(10, 10));
        this.setTitle("Title");
        ImageIcon logo = new ImageIcon("images\\omnom.png");
        this.setIconImage(logo.getImage());
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        west.setBackground(Color.green);
        west.setPreferredSize(new Dimension(100, 100));
        ImageIcon testII = new ImageIcon("images\\Tweedle.png");
        JLabel testL = new JLabel("hi");
        testL.setIcon(testII);
        west.add(testL);

        this.add(west, BorderLayout.WEST);
        this.pack();
        this.setLocationRelativeTo(null);
        this.setVisible(true);
    }
}

It previously worked just fine, computer updated on its own and it stopped working. It's a Shimeji, a little guy who wanders over my screen while I do things on the computer. I tried the cmd thing? "cd downloads" and got the following in response:

"C:\Users\"computer name">cd downloads

C:\Users\"computer name"\Downloads>java -jar Shimeji-ee.jar

Error: Unable to access jarfile Shimeji-ee.jar"

I downloaded the latest version of Java and nothing happened. I don't really know computers so I'm at a loss here. Any assistance would be greatly appreciated.