Let’s discuss a little bit about classes. A very good analogy of a class is a factory. Think about a car factory. On the placement of order, it provides us with the number of vehicles we ordered for. Similarly, you can see number of other factories in your daily-life that manufacture the specific products. Let’s take this analogy in C++ language. Suppose, we want to make a factory in C++. By the way, what is our Node class? It is actually a factory that creates nodes. When we want to make a new node, a new operator is used. By using new operator with the Node class, actually, we send an order to Node factory, to make as many as nodes for us. So we have a good analogy, to think about a class as a factory. The products that are made by the factory have their own characteristics. For example, a car made by an automobile factory has an engine, wheels, steering and seats etc. These variables inside a class are called state variables. Now the kinds of operations this car can do are the methods of its class. A car can be driven, engine can be started, gears can be shifted and an accelerator can be pressed to run it faster. Similarly, the Node class creates nodes, where every node has two-state variables i.e. object and nextNode. We have already seen its operations in the code. We use new to create new object or an array of new objects, stored in memory.
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