This interface is extended by all Events that has a result that is used by the event. An event's result can be one of three values:

• allow
• deny
• default

The meaning of these is dependent on context. Generally, denying an event prevents a specific event-related action from taking place (even if it wasn't guaranteed to take place). Likewise, allowing an event will force a behaviour to take place (even if it wasn't guaranteed). Default simply causes the event to continue with its normal logic. Not all events use every result.

It might be required to import the class to avoid errors.
import crafttweaker.event.IEventHasResult;

• event.result Getter, returns a string value of default, deny or allow
• event.deny() Method, sets the event's result to deny
• event.allow() Method, sets the event's result to allow
• event.default() Method, sets the event's result to default