However, from Java 8 onwards, an interface can also have default and static methods.Ībstract classes in Java do not support multiple inheritance. The following table draws the key differences between interfaces and abstract classes in Java:Īn abstract class can have both abstract and non-abstract methods.Īn interface can only have abstract methods. Well, this article will help you understand the key differences between an abstract class and an interface in Java. Though an abstract class and interface share a similar purpose of achieving abstraction in Java, they have a lot of differences.ĭifference between Abstract Class and Interface in Java In Java, we can achieve abstraction using an abstract class and an interface. It is a property that emphasizes displaying only the essential details of an object and hiding trivial details. Also, it is a high-level and secure programming language primarily used as a server-side language for back-end development projects.ĭata abstraction is one of the concepts of It follows multiple programming paradigms, including imperative, concurrent, generic, and functional. “Interface in Java – Javatpoint.”, Available here.Java is a class-based, general-purpose, and object-oriented programming language. “Abstract Class in Java – Javatpoint.”, Available here.Ģ. The difference between abstract class and interface in java is that abstract class is used to implement abstraction while interface is used to implement abstraction as well as multiple inheritance. Implementationįurthermore, abstract class is can be implemented using keyword “implements” whereas interface is used to implement abstraction as well as multiple inheritance. An interface class can be implemented using keyword “implements”. In addition, an abstract class can be extended using the keyword “extends”. Keyword of the ClassĪlso, the abstract keyword is used to declare the abstract class but the interface keyword is used to declare an interface. Therefore, we can say the applicability as a difference between abstract class and interface in Java. But interfaces can be used to implement multiple interfaces. Moreover, abstract classes cannot be used to implement multiple inheritance. MethodsĪnother difference between abstract class and interface in Java is that abstract class can have abstract methods and non-abstract methods while interface can only have abstract methods. While an abstract class can have final, non-final, static and non-static variables, an interface can only have static and final variables. The variables used is one difference between abstract class and interface in Java. This is the basic difference between abstract class and interface in Java. In contrast, an interface in Java is a reference type that is similar to a class that is a collection of abstract methods. Difference Between Abstract Class and Interface in Java DefinitionĪn abstract class is a class declared with an abstract keyword, which is a collection of abstract and non-abstract methods. The obj.display will call the display method in C and prints “Hello World!”. In the main method, an object of C is created. Class C provides the implementation for method display. Class C implements both interface A and B. Interface A and B both have the abstract method display. It is not possible to create objects from an abstract class but it is possible to create objects from a class that extends the abstract class. A class can extend an abstract class and implement the abstract methods of the abstract class. An abstract class can have abstract methods as well as non-abstract methods. – Comparison of Key Differences Key TermsĪbstract Class, Interface, Multiple InheritanceĪ class that is declared with the abstract keyword is known as an abstract class. What is the Difference Between Abstract Class and Interface in Java It is possible to implement multiple inheritance using interfaces. Multiple inheritance refers to using data and methods of multiple classes. It refers to using data and methods of an already existing class. Moreover, inheritance is another OOP pillar. In Java, there are two methods to achieve abstraction: by using abstract classes and by using interfaces. It allows the programmer to focus on what the object does instead of how it is done. For example, the user does not need to understand the circuitry inside the remote control to operate it. It is the process of hiding the implementation details and displaying only the functionality to the user. One major pillar in Object Oriented Programming (OOP) is Abstraction. The main difference between abstract class and interface in Java is that the abstract class is used to implement abstraction while interface is used to implement abstraction as well as multiple inheritance.
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