What is the difference between abstraction and interface

Computer Network. Compiler Design. Computer Organization. Discrete Mathematics. Ethical Hacking. Computer Graphics. Software Engineering. Web Technology. Cyber Security. C Programming. Control System. Data Mining. Data Warehouse. Javatpoint Services JavaTpoint offers too many high quality services. An interface is just that; how you interface with your code. This is normally in the form of public functions in your classes, though not necessarily.

Ideally, the interface should describe what something can do, without being affected by how it does it. For example, you might have a function to get a person to walk, but not one to move their individual muscles. The interface describes how a feature is used which is what a function prototype does. A client calling the function need not worry how the function is implemented ie how it go about doing things. In short you have a layer of abstraction. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. What is the difference between abstraction and interface? Asked 5 years, 3 months ago. Active 5 years, 3 months ago. Viewed 86 times. Improve this question. I understand "abstraction" is more general word more abstract btw , 1.

Word "interface" is more specialistic, belong to writing code programming — Jacek Cz. Add a comment. Active Oldest Votes. Prerequisite — Interface , Abstract Class Abstraction: Hiding the internal implementation of the feature and only showing the functionality to the users. Both abstract class and interface are used for abstraction.

Attention reader! Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. Abstract class vs Interface Type of methods: Interface can have only abstract methods.

An abstract class can have abstract and non-abstract methods. From Java 8, it can have default and static methods also. Final Variables: Variables declared in a Java interface are by default final. An abstract class may contain non-final variables. Type of variables: Abstract class can have final, non-final, static and non-static variables.

The interface has only static and final variables. Implementation: Abstract class can provide the implementation of the interface. Multiple implementations: An interface can extend another Java interface only, an abstract class can extend another Java class and implement multiple Java interfaces.

Accessibility of Data Members: Members of a Java interface are public by default. A Java abstract class can have class members like private, protected, etc. See this….. Consider using abstract classes if any of these statements apply to your situation: In the java application, there are some related classes that need to share some lines of code then you can put these lines of code within the abstract class and this abstract class should be extended by all these related classes.

You can define the non-static or non-final field s in the abstract class so that via a method you can access and modify the state of the Object to which they belong.

You can expect that the classes that extend an abstract class have many common methods or fields, or require access modifiers other than public such as protected and private. Consider using interfaces if any of these statements apply to your situation: It is a total abstraction, All methods declared within an interface must be implemented by the class es that implements this interface.

A class can implement more than one interface. It is called multiple inheritances.