An interface is a fully abstract class that helps in Java abstraction. In this tutorial, we will learn about interfaces in Java with the help of examples.

Example interface FirstInterface { public void myMethod(); // interface method } interface SecondInterface { public void myOtherMethod(); // interface method } class DemoClass implements FirstInterface, SecondInterface { public void myMethod() { System.out.println("Some text.."); } public void myOtherMethod() { System.out.println("Some other ...

6 days ago · An interface in Java defines a set of behaviours that a class can implement, usually representing an IS-A relationship, but not always in every scenario. Example: This example demonstrates how an interface in Java defines constants and abstract methods, which are implemented by a class. Java

Apr 29, 2025 · In this example, we have defined an interface named Shape, which includes a method area() that calculates the area of a shape. Then, we have defined two classes, Circle and Rectangle, both of which implement the Shape interface.

Sep 11, 2022 · In this guide, we will cover what is an interface in java, why we use it and what are rules that we must follow while using interfaces in Java Programming. What is an interface in Java? Interface looks like a class but it is not a class.

Nov 8, 2024 · In this tutorial, learn what is an Interface and how to implement Interface in Java with example program. Also know the difference between Class and Interface.

Jun 28, 2019 · Java interface is an abstract type that defines methods that classes must implement. It can contain constants, abstract method signatures, default methods along with an implementation body, static methods along with an implementation body, and nested types. Java Interface defines the “contracts” and represents the IS-A relationship.

Interface Example in Java: Let us see an example to understand how the interface is used in the java application. Let us first create an interface with the name Shape and then copy and paste the following code into it.

2 days ago · Here's a simple explanation of both: Java Classes A class in Java is a blueprint or template used to create objects (instances). It contains: Fields (Instance Variables): To store the state of objects. ... Example of an Interface: public interface AnimalBehavior { void eat(); // Abstract method void sleep(); }

Feb 1, 2020 · Interface in Java is a bit like the Class, but with a significant difference: an interface can only have method signatures, fields and default methods. Since Java 8, you can also create default methods. In the next block you can see an example of interface: