Is interface an abstract class in Java?

Interface contains only abstract methods that can’t be instantiated and it is declared by keyword interface. A class that is declared with the abstract keyword is known as an abstract class in Java .9 Şub 2021

Abstract classes should be used primarily for objects that are closely related, whereas interfaces are best suited for providing a common functionality to unrelated classes . Interfaces are a good choice when we think that the API will not change for a while.

An abstract class can inherit a class and multiple interfaces . An interface cannot declare constructors or destructors. An abstract class can declare constructors and destructors. It can extend any number of interfaces.26 Şub 2022

Remember, a Java class can only have 1 superclass, but it can implement multiple interfaces. Thus, if a class already has a different superclass, it can implement an interface, but it cannot extend another abstract class . Therefore interfaces are a more flexible mechanism for exposing a common interface.