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With all due respect, this is wrong. And it is a very common misconception of a class in object-oriented programming. Classes are not organizers of functions. And objects are not data structures.
So what is a “proper” object? Which one is not a proper one? Even though it is a very polemic subject, it is very important. Unless we understand what an object is, how can we write object-oriented software?
Well, thanks to Java, Ruby, and others, we can. But how good will it be? Unfortunately, this is not an exact science, and there are many opinions. Here is my list of qualities of a good object. This definition is not correct because it places classes into a passive position. This definition assumes that someone will get a template and build an object by using it. This may be true, technically speaking, but conceptually it’s wrong.
Nobody else should be involved—there are only a class and its children. Once constructed, the object is acting on its own. It shouldn’t know who constructed it and how many more brothers and sisters it has in the class. Moreover, an object should be anthropomorphized, i. An employee, a department, an HTTP request, a table in MySQL, a line in a file, or a file itself are proper objects—because they exist in real life, even when our software is turned off.
To be more precise, an object is a representative of a real-life creature. It is a proxy of that real-life creature in front of all other objects. Without such a creature, there is—obviously—no object. In this example, I’m asking File to construct a new object photo, which will be a representative of a real file on disk.