What is the difference between Abstract Class and Interface in Java?

An interface is a myriad of abstract methods used to define a behavior that the class has to achieve. Unlike abstract class, an interface offers full abstraction in Java.

An abstract class in Java is a category that is proclaimed abstract. It may or may not contain default method application Like object-oriented programming, abstraction in Java is achieved using abstract classes and interfaces. In Java, abstraction involves hiding the unimportant details from the user to concentrate only on the crucial information to increase efficiency and decreasing complexity. However, Java does not endorse multiple inheritances; an interface is sometimes ideal for providing a basis for class hierarchy. An interface is more of a design of a class, which is also used to attain abstraction in Java. An interface is a compilation of abstract methods is used to specify a behavior that the class must implement.