是否可以强制类型参数在类上可以为空

public class MyClass<T extends Object> {
    private T myField;

    public void setMyField(T myField) {
        this.myField = myField;
    }

    public T getMyField() {
        return myField;
    }
}

public class MyClass<T> where T : class {
    private T myField;

    public void SetMyField(T myField) {
        this.myField = myField;
    }

    public T GetMyField() {
        return myField;
    }
}

from typing import TypeVar, Union

T = TypeVar('T', bound=object)

class MyClass:
    def __init__(self, my_field: Union[T, None]):
        self.my_field = my_field

    def set_my_field(self, my_field: Union[T, None]):
        self.my_field = my_field

    def get_my_field(self) -> Union[T, None]:
        return self.my_field