Typically, when players want to play Minecraft on their mobile devices, they have to do so through a version of the game that runs on the Bedrock Edition codebase.

Minecraft 1.21.1 debuted for Java Edition on August 8, 2024, as a hotfix update to fix a few critical exploits that were being used to intentionally crash multiplayer servers.

Opening the game while having an active internet connection Downloading Minecraft 1.21.43 update APK file and install it manually on your Android device (Not recommended) ...

QUICK ANSWER To change your Minecraft name in the Java Edition, head to Minecraft.net and log in with your account.