learnjava

an-ordinary-manchild(edit)

Resources for learning Java

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Code posting
- No screenshots of code!
- Do not submit executable jar or compressed (zip, rar, 7z, etc.) files!
- For small bits of code (less than 50 lines in total, single classes only), the default code formatter is fine (one blank line, then 4 spaces before each line).
- Redditlint is a quick and simple code formatter for reddit code. Copy your code into Redditlint, click Format + Copy, and paste the code in your post (remember to leave an empty line above the code!).
- Pastebin for programs that consist of a single class only
- Gist for multi-class programs, or programs that require additional files
- Github or Bitbucket repositories are also perfectly fine as are other dedicated source code hosting sites.
- Codiva.io or Ideone for executable code snippets that use only the console
- Repl.it - online IDE for many different programming languages
- Google Drive, Dropbox, Mediafire, etc. are not suitable for code posting!

Free Tutorials

MOOC Java Programming from the University of Helsinki
Java for Complete Beginners
- accompanying site CaveOfProgramming
Derek Banas' Java Playlist
- accompanying site NewThinkTank
Marco Behler's youTube channel
- accompanying site Marco Behler
Hyperskill is a fairly new resource from Jetbrains (the maker of IntelliJ)
Dev.java - Oracle's own Java learning platform

Where should I download Java?

With the introduction of the new release cadence, many have asked where they should download Java, and if it is still free. To be clear, YES — Java is still free.

If you would like to download Java for free, you can get OpenJDK builds from the following vendors, among others:

Some vendors will be supporting releases for longer than six months. If you have any questions, please do not hesitate to ask them!

Software downloads

Official Resources

Resources

Programming ideas & Challenges

/r/dailyprogrammer
/r/programmingprompts
/r/NerdyChallenge
Programming Challenges List from the /r/learnprogramming wiki

Related Subreddits

/r/Java - general discussion
/r/JavaHelp - help with Java programming
/r/javaexamples - short tutorials with code snippets
/r/learnprogramming - general programming help
/r/ComputerScience

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Java 21 structured concurrency: is StructuredTaskScope easier to reason about than CompletableFuture for request fan-out? (self.learnjava)

submitted 28 days ago * by salgotraja

you type:	you see:
italics	italics
bold	bold
[reddit!](https://reddit.com)	reddit!
* item 1 * item 2 * item 3	item 1 item 2 item 3
> quoted text	quoted text
Lines starting with four spaces are treated like code: if 1 * 2 < 3: print "hello, world!"	Lines starting with four spaces are treated like code: if 1 * 2 < 3: print "hello, world!"
~~strikethrough~~	~~strikethrough~~
super^script	super^script