Note that if it has an emoji with ✅ it means I've either made them and it works or I've found tutorials that prove it.

and last thing before starting if I add a ⚠️

This would mean that you risk getting banned

and that would also mean that I have been well informed so I know myself if for example you can get banned for example from Sony Services

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MC Java on 3DS:

It would be theoretically possible because I've seen a lot of tutorials like installing a homebrew that adds an Android OS called: CYANOGEN3DS and it might be possible to install Pojavlauncher for more info from the sources at the end, so it would be possible to play MC Java on the 3DS, even if I have to admit that it would really slow down your system because java is a really greedy programming language. So if it were possible, I'd recommend you to do it. The answer is no, because Minecraft Java is very poorly optimized, because the Minecraft java code has never been reencoded from scratch, which is why Java doesn't work with several of your threads on your PC :(

MC Java on Nintendo Switch ✅⚠️

Yes because it is possible to install Android but just Android because you can install Unbuntu, Linux Mint, etc because a Nintendo Switch is a console with better performance than a 3DS so you can install a Launcher and play Java with your Switch BUT WARNING Switch hacks can lead to a ban on the Nintendo Online service, it's illegal but with their army of lawyers they can do it :(

MC Java on PS4: ✅ ⚠️

YES it is possible by installing a Linux distribution

but I know less well so do some research because maybe the PS4 is a bit like the Switch that you can get banned from multiplayer services