So, how does a player join another's private world? They can join friends on Minecraft Pocket Edition and Bedrock, hop on a LAN server (Java), or connect to a realm. Here's an overview of what is ...

For the Java Edition, cross-play with the Bedrock is not officially supported. However, tools like GeyserMC allow the Bedrock players to connect to the Java servers easily.

Of course, you will be able to cross-play with either Java or Bedrock players by launching whichever edition your friends are playing." ...

Like Bedrock, mods, realms and skins can be used in the Java version of Minecraft, and the servers are always packed with people looking to play alongside you.