How can we achieve 100 abstraction in Java using interface?

In java, abstraction is achieved by interfaces and abstract classes. We can achieve 100\% abstraction using interfaces. Abstract classes and Abstract methods : An abstract class is a class that is declared with an abstract keyword.

Is 100\% abstraction possible?

Note: Using an abstract class, we can achieve 0-100\% abstraction. Remember that, we cannot instantiate (create an object) an abstract class. An abstract class contains abstract methods as well as concrete methods. It means that fields are public static and final by default and methods are empty.

Can we achieve 100 percent abstraction in an abstract class and if yes how if no why?

An abstract class may or may not have abstract methods. We cannot create object of abstract class. It is used to achieve abstraction but it does not provide 100\% abstraction because it can have concrete methods.

How interface helps achieve abstraction?

An interface in Java is a specification of method prototypes. The user who want to use the methods of the interface, he only knows the classes that implement this interface and their methods, information about the implementation is completely hidden from the user, thus achieving 100\% abstraction.

Can we achieve abstraction in Java without using interface and abstract class if yes then how?

And yes, you can declare abstract class without defining an abstract method in it. Once you declare a class abstract it indicates that the class is incomplete and, you cannot instantiate it.

How abstraction is achieved by interface?

How is abstraction achieved?

Data abstraction is a method where essential elements are displayed to the user and trivial elements are kept hidden. In Java, abstraction is achieved by using the abstract keyword for classes and interfaces. In abstract classes, we can have abstract methods as well as concrete methods.

How does Interface achieve abstraction?

Can we achieve 100\% abstraction using interfaces in Java?

We can achieve 100\% abstraction using interfaces. An abstract class is a class that is declared with an abstract keyword. An abstract method is a method that is declared without implementation. An abstract class may or may not have all abstract methods.

How to achieve 100\% abstraction from the user?

The user who want to use the methods of the interface, he only knows the classes that implement this interface and their methods, information about the implementation is completely hidden from the user, thus achieving 100\% abstraction.

How do you declare an abstract class in Java?

We use the abstract keyword before the class name to declare the class as abstract. Note: Using an abstract class, we can achieve 0-100\% abstraction. Remember that, we cannot instantiate (create an object) an abstract class. An abstract class contains abstract methods as well as concrete methods.

What is the use of interface in Java?

We say Interface is used to achieve 100\% abstraction i.e. hide all the implementation. But in Interface, all the methods are declared abstract. There is no implementation. And when the other class implements the same interface then there is no more abstraction as the implementation is defined in the class which implements it.