"Minecraft" offers cross-platform play for both versions of the game — Bedrock and Java — but you can only play with users ...

To install Java on Windows and run Java apps on Microsoft’s operating system, you need to obtain a copy of the Java Development Toolkit (JDK) installation media. The JDK includes both a Java Runtime ...

To reallocate RAM to "Minecraft," you'll have to edit the game's settings through whatever launcher app you use.