To invite your own friends to join your Realm, the process is different for Java and Bedrock. How to invite friends to a Realm in Java To invite friends to your Realm in Minecraft Java, you should: ...

The player will now be able to join any online servers on Java Edition. If this does not work, they might have to log out and log in with their Microsoft account in the Minecraft launcher.

In Minecraft, thousands of players can join a single world to play together. The multiplayer features in both Java and Bedrock Edition are used by millions of players regularly.

Use ForkJoinPool to break down computationally intensive tasks and execute them in parallel for better Java application performance.