You’re trying to use the non-static inner positionObj class without an instance of Secretary for it to belong to. A non-static inner class must belong to an instance of its parent class You should probably change positionObj to a normal class or a static inner class. Alternatively, you can write someSecretary.new positionObj() to create an … Read more
Classes have a “class body” that is a constructor. If you use an internal constructor() function, that function would be the same class body as well, and would be what is called when the class is called, hence a class is always a constructor. Constructors requires the use of the new operator to create a … Read more
The error in question is caused when you try to access the Manager of a model through an instance of the model. You have used lower case class names. This makes it hard to say if the error is caused by an instance accessing the Manager or not. Since other scenarios that can cause this … Read more
A class is a blueprint which you use to create objects. An object is an instance of a class – it’s a concrete ‘thing’ that you made using a specific class. So, ‘object’ and ‘instance’ are the same thing, but the word ‘instance’ indicates the relationship of an object to its class. This is easy … Read more
The Instance and Object are from Object Oriented Programming. For some programming languages like Java, C++, and Smalltalk, it is important to describe and understand code. In other languages that used in Structured Programming, this concept doesn’t exist. This is a view from Structural Programming. There’s no real significant difference that should consume too much … Read more
isinstance() is your friend here. It returns a boolean and can be used in the following ways to check types. if isinstance(obj, (int, long, float, complex)): print obj, “is a built-in number type” if isinstance(obj, MyClass): print obj, “is of type MyClass” Hope this helps.
NSStringFromClass([instance class]) should do the trick.