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  • Abstraction is the process of hiding or abstracting away details that are irrelevant to a given problem. In Java, abstraction is a key part of the interface and implementation.
  • An interface is a set of declarations that specify how one or more abstract classes should be implemented by one or more concrete classes.

The benefits of abstraction and interfaces are numerous, but it is important to keep in mind that these benefits can be achieved without abstraction and interfaces.

The relationship between abstraction and interface is a central question of the design process. The term "abstraction" means to remove or separate from something, while "interface" means to interact with something.

Interfaces are a form of abstract classes that provide a set of methods that can be implemented by other classes. For example, if you are implementing an interface called Comparable, then you need to implement the compareTo method.

Types of abstractions:

  • Structural abstraction - A structural abstraction is an abstraction that contains the basic building blocks of the original entity. It can be anything from a mathematical formula to an algorithm.
  • Formal abstraction - A formal abstraction is an abstraction that has been created by taking the original entity and converting it into a set of rules, laws, or axioms with which the new entity can operate. These rules are then used to create new entities and make predictions about them.
  • Conceptual abstraction - A conceptual abstraction is an abstract idea that is based on real-world examples rather than mathematical formulas or algorithms.

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