在构造函数中从已保存的对象创建对象

To be clear: I have an object which is continiously changing its values during the runtime and I want to save the created and modified object on a file. I found how to that and I found also how to read back the object saving it into one another. But the question is: is it possible to call the class constructor of my object with the only parameter of the file in which the object I want to retrieve is stored? To be clear: I have an object which is continio