Data abstraction is the process of hiding certain details and showing only essential information to the user. Abstraction can be achieved with either abstract classes or interfaces (which you will learn more about in the next chapter).The abstract keyword is a non-access modifier, used for ...
Abstract method: can only be used in an abstract class, and it does not have a body. The body is provided by the derived class (inherited from).An abstract class can have both abstract and regular methods:abstract class Animal { public abstract void animalSound(); public void sleep() {...