r/learnjava

What should I do?

I am done with java basics and decent OOP, I want to start with DSA but I am completely confused about which resources to refer to like a book or course or something.

Please help.

[supprimé]

I recently started trying to learn Java and was wondering if anyone else here is also learning it?

None of my friends are into coding so it’s kinda hard staying motivated sometimes lol. I’ve tried learning Python, Luau, and Lua before, but Java is the first language that’s actually clicked with me properly. I eventually wanna learn C# too so I thought Java would be a good place to start.

I’m still a complete beginner, so if anyone else is learning too, has advice/resources that helped them, or even wants to learn together, I’d appreciate it.

Hi, currently I'm using sax parser for read bulk excel data in java automation framework, is there any other best approach better than using sax parser? I want to improve performance and minimize memory utilization.

Hello!! I’ve been learning Java in university for a while now, and I’m confident in my OOP and Data Structures knowledge. However I feel like the algorithms classes really disappointing and I didn’t learn a lot, so during the summer I want to learn more, but I’m not sure what should I do. Where do I get started? How do I make sure my time isn’t wasted?

Hello, i am a bit lost here and wantet to ask for some help.

I did a Prestige to myself in deleting my save state and trying it all by my own without copying something and now i am at a loss at why my variable wouldn work the same as the ns. "funktion?"? Is it cause if i declare a variable it only checks it when it starts the script and doesnt iterate it again, even the variable is called or what am i not understanding?
i am adding on the examples of the working one with the ns. version and the not working one with the call over the veriable. The script just keeps running with the veriable version.

#Trigger: i am dislexic XD no one ever told me coding is math *.*

Oh and greeting to the community! guess i will engage more in the future:))

https://preview.redd.it/uh9as4gw3z1h1.png?width=1831&format=png&auto=webp&s=5ffbfff05fa79767017851d1c5b1ed6ab39886d2

https://preview.redd.it/7xe838674z1h1.png?width=1707&format=png&auto=webp&s=ecc7be1c384a3694ce8ff5c72ba05805e60eae21

FIRST COMPANY -> 3+ years

3 + years as a java production support engineer

(Worked entirely on stored proc never really opened Java code)

SECOND COMPANY -> 4+ years

Did nothing for the first year here.

Got a legacy java project majorly batch processing.

Most of the work is to implement bussiness logic which is adding IF conditions and sometimes handling API responses.

THIRD COMPANY -> Less than a year here

CLIENT wanted me to join their new vendor last year so I joined here.

Same work continues here.

What to do next ?

I dont feel I am good in Java. Don't feel I will be able to get a job if I am laid off. I have solved production issues, Worked with the bussiness but still nothing feels like I did something good or I am learning something.

If I try to practise DSA I drop out of it after 4 /5 questions majorly becoz of work. I gave everything to this project when their is any issue but in the end I am still not aware of many things with this project. Have completed 3 years in this project. But still many things are completely new.

Any new issue is mostly deep dive into application code , devops team and networking teams. No documents no senior resources to support.

The people I work with sometimes dont know how to code IF statement in the existing code.

Financial stability is also not there but I am at a better place now then from 7 years back.

What should I do ?

What course to take ?What sample project to do ?

Any resource which helps master core java spring spring boot unit testing microservices docker Kafka kubernetes ci cd git fundamentals along with AI ?

What about system design?

So many questions and I am just left procrastinating.

Stuck in Course bubble of finding the course to start my prep in being a decent senior software engineer.

Any suggestions or anything that can help me in being a good programmer and have a decent working life.

I'm doing a school assignment where I have to input 20 click speeds in an integer array. It would work normally if I do each input in a separate line, but it looks too long and I kinda wanna shorten it.

Something like this:
Enter the click speeds:
23 16 54 (you get the idea)

I saw somewhere where you use .split() in Scanner, but we haven't learnt that so we can't use it.

Any help will be appreciated

Edit: By 'too long' I meant that when i input the numbers when it is running
like each input is on a different line so the terminal window would be like too much. I want all inputs on the same line

Hiiii,

we’re currently working on a student project where we’re developing a smart insole for gait analysis with integrated pressure sensors, and I’d really appreciate any advice because we’re basically building this from scratch without ANY prior hardware/software experience.

The general idea is:

- insole with around 6–8 pressure sensors
- collect pressure data in real time while walking
- transmit the data wirelessly (probably Bluetooth via something like ESP32?)
- visualize the pressure distribution as a real-time foot pressure heatmap
- detect gait phases / irregularities later on

I’m mainly responsible for the software side, so I’m currently trying to build the visualization in JavaFX. The plan right now is to create a foot-shaped heatmap by placing a foot mask (PNG), then interpolating between sparse sensor points (probably using Inverse Distance Weighting / IDW, maybe bilinear interpolation

But since we only have 6–8 sensors, I’m unsure what the most realistic / professional approach is.

A few questions:

1. Sensor choice
   What pressure sensors would you recommend for a smart insole prototype?
   practical for:
   - repeated load
   - decent accuracy
   - reasonable budget
   - real-time responsiveness

2. Sensor placement
   Biomechanically, where would you place them?

I think:
- heel
- medial forefoot / ball of foot
- lateral forefoot
- maybe arch?

But I’d love input from other people

Goal:
something visually similar to medical plantar pressure maps

3Calibration
How would you calibrate pressure sensors for something like this?

Things I’m wondering:
- normalize per sensor?
- user-specific calibration?
- thresholding?
- drift compensation?

4. Gait analysis
   Once the pressure stream works, how would you approach gait detection?

For example:
- heel strike
- mid stance
- toe-off
- step count
- cadence
- asymmetry
- abnormal loading

5. General “things beginners underestimate”
   This is probably our biggest issue 😅

We don’t have any prior lecture knowledge in embedded systems / biomechanics / signal processing, and we’re teaching ourselves while building this.

So honestly any advice helps:
hardware, software architecture, sensors, BLE, signal filtering, visualization, calibration, gait logic blbla literally anything that would make this easier. also if you know where i can find similar projects lmk pls
Thanks a lot for reading allat :)

Hey Guyz, How to find highest occuring element in Array not the maxELement Highest frequency ? I know hashMap solution but there are some confusions and doubts there I really didn't getting that solution but is the optimal one, so pliz explain in a little simple way.

Hello, Im currently in Computer Science, and after taking DSA, ive been using Python regularly and not looking back to my freshmen days to Java.

Trying to expand my knowledge of several computer languages to at least be able to handle being a freelance full stack developer, with front end languages like React Native, Flutter, and probably PHP via Laravel.

But is Java worth going back to? Should I fully cement the knowledge on understanding Java outside of OOP?

Need help choosing between these 2 Java + Spring Boot backend courses:

1. AlgoCamp Spring Boot (Sanket Singh)

2. Coding Shuttle Cohort 5.0 (Anuj Kumar Sharma)

Background:

- 2025 grad

- Currently in a analyst role with <1 YOE

- Want to switch to Backend Development

- Know Java basics + SQL

I want a course that is practical, helps build strong projects, and makes me job-ready for backend roles.

From what I understood:

- Sanket Singh → deeper backend engineering concepts

- Coding Shuttle → more beginner-friendly and structured

Which one would you recommend for someone targeting a backend switch in the next 3-5 months?

Hey guys. So I have finally learn essential Java. From variables, conditionals, and OOP all the way to threading. So what should I do next? Any suggestions?

Hey everyone,
I need to learn the basic java syntax until friday. As I am not new to programming as i know C and Python I just need a good resource for quickly learning the syntax. Best would actually be just a bunch of small entry level programming tasks with a little of explanation.
The most thing I struggle is about class and function initialisation like what is public and static about.
If anyone has any resources I’d appreciate it very much :)
Have a nice weekend everyone

Hi, I'm trying to make a function that does this:
-Assigns input to a string
-Warns you if it contains anything that isn't a normal integer
-Assigns the contents to an int variable if the string only contains any conbinations of numbers 1 to 9.

I'm tryin to use the ! operator to check if a string contains anything that isn't a specific symbol but it seems to behave very strangely when used alongside the || operator.
It returns false if I input "12" or "21" but true if I input "1", "2" or any other numbers or letters.

Can anyone help me get this to work?

Hey guys I am about to complete mooc .fi java part 1. I want to start dsa now but I don't want to get into lectures and all like youtube videos . I just love the way of mooc.fi like a but theory then questions like this.so is there any resource like that and will be get certificate too coz I will be entering 3rd year now n we need to show one certification course completion certificate to our clg for 5th sem exams . It's must . So I have my exams from 19may to 6june then I am free till aug end . So should I do development certification course or dsa type. And what projects to make . And since I am from tier 4 clg where companies don't visit we hv to apply off campus so most company's summer internship 2027 hiring will be from july-aug what should I exactly do .ryt now. Completely lost regarding hackathons etc. I hv never participated in hackathons not I have team or friends

Suggest some youtube resources as I always need someone to explain I can't read and get it right always .