通常我们定义接口的时候都是

type IFIrst interface{
FirstFunc()
}

type ISecond interface{
SecondFunc()
}

type Entity struct{
}

func (e *Entity)FirstFunc(){
print("first called")
}

func (e *Entity)SecondFunc(){
print("second called")
}

func main(){
var obj any
obj = &Entity{}

if first,ok:=obj.(IFirst);ok{
first.FirstFunc()
}

if second,ok:=obj.(ISecond);ok{
second.SecondFunc()
}
}