What’s an interface in Java programming?

Conceptually, an interface is a class that defines a set of methods with no implementation. It is analagous to a pure virtual or “abstract” class in C++. Java does not support multiple inheritance in the same way as C++. In C++, any class from be derived from any number of classes. In Java, a class can only be deried from a singleclass. However, a class can implement any number of interfaces. This allows a more restrictive form of polymorphism than that available inC++, but actually winds up being sufficient to meet the needs of most object-oriented programs. The Java core APIs have many examples of interfaces. For example, the AWT event model depends heavily on a set of Listener interfaces that define methods for responding to specificevents. The interfaces do not implement any methods, but rather define methods that would have to be implemented by a class desiring to interact with AWT events. This particular use of interfaces is akin to the use of function pointers in C to implement callback functions for GUIs. A class implements one or more interfaces byusing the keyword implements the same way extends is used for subclassing.

See also  How to Create and Deploy QR Codes Online: A Comprehensive Guide

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist