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. Learn to code solving problems and writing code with our hands-on Java course.

Another way to achieve abstraction in Java, is with interfaces. An interface is a completely " abstract class " that is used to group related methods with empty bodies: To access the interface methods, the interface must be "implemented" (kinda like inherited) by another class with the implements keyword (instead of extends).

Mar 28, 2025 · Example: This example demonstrates how an interface in Java defines constants and abstract methods, which are implemented by a class. {...} Note: In Java, the abstract keyword applies only to classes and methods, indicating that they cannot be instantiated directly and must be implemented.

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.

3 days ago · Learn use of interface in java application with realtime example scenario. Mainly five reasons to use interface in java. It allows multiple

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.

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:

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.

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.

Apr 1, 2025 · By default, all the methods in the interface are public and abstract. A simple example of an interface in Java is given below. public static final String color = “Red”; public void calculateArea(); The above example defines an interface ‘shape’ which has a static variable and an abstract method ‘calculateArea ()’.