Can I still play the Java version of minecraft if I redeem my windows 10 version for free?

As I have redeemed my Windows 10 version I can confirm:

Yes, you can still use your JAVA version.

You keep your Mojang Account that allows you to download the Java launcher, as well as the Windows 10 version.

As someone who has Minecraft for both Xbox One and Windows (both Win 10 version and the Java version) I can answer this.

Poli5hesBubble: When the Windows 10 Edition (Windows Store Version) of the Minecraft entered public Beta in 2015/2016, owners of the pre-existing Java version were given a key to download and own the Windows 10 Edition (Windows Store Version) for free, as
they already owned it for PC (in Java form). However, this does NOT work in reverse; if you bought the Windows 10 Edition (Windows Store Version), you will NOT be given a free copy of the Java version.

KyleCBlanchard: Similar to the answer for Poli5hedBubble, if you own the Java version from Minecraft.net, you should be able to go to your Mojang account, log in and see a key that, once entered into the Windows Store or at redeem.microsoft.com, will allow
you download the free copy of Minecraft: Windows 10 Edition for free.

As someone who has Minecraft for both Xbox One and Windows (both Win 10 version and the Java version) I can answer this.

Poli5hesBubble: When the Windows 10 Edition (Windows Store Version) of the Minecraft entered public Beta in 2015/2016, owners of the pre-existing Java version were given a key to download and own the Windows 10 Edition (Windows Store Version) for free, as
they already owned it for PC (in Java form). However, this does NOT work in reverse; if you bought the Windows 10 Edition (Windows Store Version), you will NOT be given a free copy of the Java version.

KyleCBlanchard: Similar to the answer for Poli5hedBubble, if you own the Java version from Minecraft.net, you should be able to go to your Mojang account, log in and see a key that, once entered into the Windows Store or at redeem.microsoft.com, will allow
you download the free copy of Minecraft: Windows 10 Edition for free.

Ok thank you, was just wondering.

To my knowledge the windows 10 version of Minecraft is written in C++ compared to java so it wont be compatible as the windows 10 version is a UWP app which allows it to play with Xbox one and PC while the java version is standalone, you can export worlds
from xbox to windows 10 but not from windows 10 version to java, I hope that clears up your concern

I've got both the Java and the windows 10 version and they seem to work perfectly fine.