A Method annotated with @ZenOperator cannot be called by instance.method(parameters) but instead uses Tokens like +, ! and the like.

CraftTweaker's IData

java
 Copy
@ZenClass("crafttweaker.data.IData")
@ZenRegister
public interface IData {

    @ZenOperator(OperatorType.ADD)
    IData add(IData other);

    @ZenOperator(OperatorType.SUB)
    IData sub(IData other);

    ...
}

• You can annotate all nonstatic methods. You should only annotate one method per Operator Type.
• Annotated methods, at least those which have an associated Assign token, should return the same type. (Don't do Item + Item = fluid!)
• You should give the annotation a ZenOperator value (e.g. OperatorType.ADD). You can find a list of all possible OperatorTypes here.