Abstraction refers to the quality of dealing with ideas rather than events. It basically deals with hiding the details and showing the essential things to the user. Thus you can say that abstraction in Java is the process of hiding the implementation details from the user and revealing only the functionality to them. Abstraction can be achieved in two ways:
- Abstract Classes (0-100% of abstraction can be achieved)
- Interfaces (100% of abstraction can be achieved)