golang是否有类似泛型（java）的东西？ [重复]

I want to write something like CRUD on golang. I see that like

type CRUD interface {
  Save(entity interface{})() // done
  Update(entity interface{})() // done
  Delete(entity interface{})() // done
  All() []interface{} // problem is here
}

I have several model structures.

type User struct {
  Login string
  Password string
}

type Comment struct {
  UserId int64
  Message string
  CreatedAt int64
}

and I have some service:

// Struct should implement interface CRUD and use instead of interface{} User struct
type UserService struct {
  Txn SomeStructForContext
}

func (rec *UserService) Save(entity interface{}) {
  user := entity.(*model.User)
  // TODO operation with user
}

// All the same with Update and Delete

func (rec *UserService) All() ([]interface{}) {
  // TODO: I can't convert User struct array for return 
}

I hope, it'll explain what problem is

</div>

You are trying to convert []ConcreteType to []interface{}, which does not work implicitly.

But you can convert []ConcreteType to interface{} and then cast it back to []ConcreteType.