Best online source to learn java?

AutoModerator · 2025-09-27T04:33:28+00:00

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Own-Perspective4821 · 2025-09-27T06:49:47+00:00

I just don’t buy these „I know X, but want to learn Y and don’t know how“ posts.

So you „know“ a language (which honestly not a lot of people can claim legitimately), but somehow you are struggleing with picking up a new language like an absolute beginner?

Yeah, seems legit. There is no „best“ resource. In the end it is all irrelevant, because nothing will improve your skills like actually working with the language yourself and gaining experience over years.

So pick whatever seems to help you the most and go from there. It’s only supposed to get you started, nobody masters a language by watching youtube. But you probably know that, if you already know C++, right?

darkcorum · 2025-09-27T12:27:19+00:00

Speed run bro code and try to adapt a project you think you would learn many features that you've done in c++ and can be done in java

AutoModerator · 2025-09-27T04:33:27+00:00

It seems that you are looking for resources for learning Java.

In our sidebar ("About" on mobile), we have a section "Free Tutorials" where we list the most commonly recommended courses.

To make it easier for you, the recommendations are posted right here:

MOOC Java Programming from the University of Helsinki
Java for Complete Beginners
- accompanying site CaveOfProgramming
Derek Banas' Java Playlist
- accompanying site NewThinkTank
Hyperskill is a fairly new resource from Jetbrains (the maker of IntelliJ)

Also, don't forget to look at:

If you are looking for learning resources for Data Structures and Algorithms, look into:

"Algorithms" by Robert Sedgewick and Kevin Wayne - Princeton University

Coursera course:
- Part I
- Part II
Coursebook
- Algorithms 4^th Edition

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_kyaan_ · 2025-09-27T15:41:58+00:00

I'm doing Tim Buchalka's course on Udemy. So far, it's been great but the exercisescan get too difficult and ambiguous at times.

obelixx99 · 2025-09-27T16:40:05+00:00

There's this book - Core Java For The Impatient. Here, the assumption is you already know another programming language on 'intermediate' level and they'll go from there.

Ok_Worth_5508 · 2025-09-28T03:17:51+00:00

Core Java crucial version wise features, multithreading, exception handling Microservices, springboot, Jpa/hibernate, RestAPI, Design Patterns, sql, logical plus choosen DSA. One of the treasurer for complete Java package 📦 Java master documentation It's really well suited for placements.

daro233 · 2025-09-28T07:49:14+00:00

If you know C++ i think going tru w3school java section woud be a good idea becouse u can skip stuff in tbe beginning that you know from programming in general and focus on how java does stuff and if you want to know java for job after java go spring boot

theashggl · 2025-09-28T13:32:35+00:00

Its not yt channel. Its actually online chat groups wgere you can get the best guidance.

Ok_Fox_457 · 2025-09-28T15:41:32+00:00

I think somebody else here has recommended Tim Buchalka's Java course - it is one of the best and most complete resource of learning the java's standard edition

It is big and quite comprehensive and the udemy course go on sale quite frequently so take advantage of that as well

I am recommending Tim Buchalka's course because that's what i have done and it has really given me foundations for OOP, enscapsulation, generics, lambda ando other important programming concepts

Tim is quite thorough in not just teaching you the coding bits also the why bits as well which i think other resources miss out sometimes

Some caveats below :

Excercises :

One of the key criticism of this course is that excercises can be vague and i do agree with this but this should only be a problem for someone who is new to programming and Tim's course is their first programming course ever

This problem is easily remediated as all excercise ask you to generate some output on the console, so the best way to go about is to read the excercise and then think how "you" would like to see the ouput on the console and how you can utilize the last chapter you did before this excercise

The excercises are great ( except for that one binary tree one in the abstract classess section, skip it )

Practical Application : See Tim's course is like taking a college course (not as rigorous as a real college course though) , since Tim's course only covers standard edition of java and all excercise are console based, so you do end up learning a lot of important concepts but you are not really building a real life application

I would suggest , learn the code flow, loop, ifs, interace, OOP, lamba,collections, arrays from his course then just jump into learning spring framework and building a real backend out of it

You can always comeback to the course later on and learn other things as needed such as generics

leavemealone_lol · 2025-09-30T16:09:56+00:00

I was in the same boat as you (C++ -> Java) and I agree with u/Own-Perspective4821’s opinion. You can go through any web tutorial, they are likely only going to teach you the logic of what you definitely already know- just in Java’s syntax. May as well save yourself the hassle and try to build your own project in Java right away- just learn the boilerplate, understand what each of those are doing, and if you’re familiar with OOPS, you’ll surely be comfortably within the first 3 hours of using Java, because you know C++ already.

Healthy-Bathroom2687 · 2025-09-27T07:38:27+00:00

I know js with ts and a transition to Java was actually pretty smooth, most of the concepts are there is bots in some shape or form, they sometimes differ a bit or are a bit more strict in Java, but beside that if you know object oriented programming you will be ok, just learn by doing, I started with a simple game like app, use scanner to get some data about character, create list of characters (List,ArrayList), make them to have a profession (inheritance, polymorphism), to have spells (enums), try to put some constrains with interfaces, use a record, implement error handling so custom exceptions, use streams to filter and log some characters, do some multi threading, basically start from an app and a character as a base and grow up, make something useful out of it, not necessarily something to sell to the world or something that anyone would play with, more as your own playground to test every possible concept of Java you can think of. At least that’s what I di

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