The Singleton pattern can make your life easier
When there is a lot of code, there can be a lot of complexity too. It is quite often a scenario that different parts of an app need access to the same object. That object, for examples, could be a counter generating serial numbers, a database accessor, or other types that must be instantiated only once. In the case of a counter, the program must increment the serial numbers in a consistent way; there cannot be more than one counters to provide serial numbers. In the case of a database accessor, the program must always access to the same set of data. The different parts of the app could be running concurrently, and we want to avoid having too many the objects created by error. Sometimes codes may not be written very carefully and mistakes can happen. If we want to ensure that there is always only one instance of such an object, and to have the different parts of the app easily call to it, the Singleton pattern technique can help. Let's say there is...