My guess he wants to make a class in the skript language and call the methods of it trough java. Now i am not gonna say no i am pretty shure its a no, but have seen allot of crazy stuff beeing created with skript lately.

 

Pretty sure you can execute Skript functions through java. I've seen someone do it before, but I don't remember how.

Check out the `ch.njol.skript.lang.function.Functions` class in the Skript source code.

I believe Pikachu was the original maker of this, but here is code of executing functions in scripts. You can probably convert it to java for your needs.

Code (Skript):

1. import:
2.     ch.njol.skript.lang.function.Functions
3.     ch.njol.skript.lang.ExpressionList
4.     ch.njol.skript.lang.function.FunctionEvent
5.  
6. effect call function[s] %strings% [with argument[s] %-objects%]:
7.   trigger:
8.     loop (...(raw expr-2).getExpressions()) if raw expr-2 is an instance of ExpressionList otherwise raw expr-2:
9.       add loop-value.getArray(event) to {_params::*}
10.     loop expressions 1:
11.       set {_function} to Functions.getFunction(loop-value)
12.       try {_function}.execute(new FunctionEvent(null), [{_params::*}] if {_params::*} is set otherwise null)