Have to throw out that disclosure ð. While there are a number of essential oils you can use for minor migraines and head pain, two of the top single oils are Peppermint and Lavender. Peppermint is effective for helping to relieve minor symptoms of those mind-numbing headaches that come from a variety of culprits.
An abstract class is like a class, but differs in that it only defines generic methods in the class, but does not actually implement them. Those methods will be implemented later by specialized sub-classes. This is how we get interfaces - interfaces are the implementation of the abstract class.
An abstract class is a class that can not be instantiated but that can contain code. An interface only contains method definitions but does not contain any code. With an interface, you need to implement all the methods defined in the interface. If you have logic that will be the same for all the derived classes, it is best to go for a abstract class in stead of an interface. You can implement multiple interfaces but only inherit from one class.