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I really dont think that Rust is made with java, indeed the official site https://rust.facepunch.com/presskit/ said it's make with Unity
The best way to learn to mod a game is to tackle the problem head on. 1. Start with a beginner ... Read the set up your java environment like the modders
You need to investigate the game support a little further. What language you can use depends on how the game supports mods.
Other games may have an API / interface for mods which support Java.
It usually doesn't matter what language the game was written in: what matters is what language(s) can talk to the game's mod interface.