What is interface in java: An Interface in Java is

An Interface in Java is an abstract type that defines a set of methods a class must implement. An interface acts as a contract that specifies what a class should do, but not how it should do it. It is used to achieve abstraction and multiple inheritance in Java . We define interfaces for capabilities (e.g. Comparable, Serializable, Drawable). A class that implements an interface must implement all the methods of the interface . All members of an interface are public, static, and final by ... In Java , classes and interfaces are used to define the structure and behavior of programs. While they might seem similar, since both can hold methods and variables, they have very different purposes. class-vs- Interface A class can extend another class and implement an interface , while an interface can only extend another interface , not implement a class. Class in Java A class is a blueprint for creating objects. It encapsulates fields (state) and methods (behavior) that are common to all ... In the Java programming language, an interface is a reference type, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types. Learn what an interface is in Java , how it differs from a class, and how to declare, implement, and extend interfaces. See examples of interfaces, methods, and fields in Java .