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    An interface in programming is a blueprint of a class that contains abstract methods and constants. It is used to achieve abstraction and multiple inheritance in languages like Java. Interfaces cannot have method bodies, and they provide a way to specify what a class must do, but not how it does it.

    Defining an Interface

    In Java, an interface is defined using the interface keyword. Here is an example:

    interface Language {
    void getType();
    void getVersion();
    }
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    In this example, Language is an interface with two abstract methods: getType() and getVersion().

    Implementing an Interface

    To use an interface, a class must implement it using the implements keyword. The class must provide implementations for all the methods declared in the interface. Here is an example:

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  2. Programiz
    https://www.programiz.com › java-programming › interfaces

    Java Interface (With Examples) - Programiz

    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.
    Implementing An Interface

    Like abstract classes, we cannot create objects of interfaces. To use an interface, other classes must implement it. We use the implementskeyword to implement an interface.

    Extending An Interface

    Similar to classes, interfaces can extend other interfaces. The extendskeyword is used for extending interfaces. For example, Here, the Polygon interface extends the Line interface. Now, if any class implements Polygon, it should provide im…

    Advantages of Interface in Java

    Now that we know what interfaces are, let's learn about why interfaces are used in Java. 1. Similar to abstract classes, interfaces help us to achieve abstraction in Java. Here, we know getArea() calculates the area of polygons, but the way area is c…

    Default Methods in Java Interfaces

    With the release of Java 8, we can now add methods with implementation inside an interface. These methods are called default methods. To declare default methods inside interfaces, we use the defaultkeyword. For example,

  3. W3School
    https://www.w3schools.com › java › java_interface.asp

    Java Interface - W3Schools

    Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.

  4. GeeksForGeeks
    https://www.geeksforgeeks.org › java › interfaces-in-java

    Java Interface - GeeksforGeeks

    Nov 27, 2025 · Interface is ideal for achieving abstraction and multiple inheritance. Let’s consider the example of Vehicles like bicycles, cars and bikes share common functionalities, which can be defined …

  6. tpointtech.com
    https://www.tpointtech.com › interface-in-java

    Interface in Java - Tpoint Tech

    Jan 3, 2026 · The following example demonstrates how one interface can inherit another interface and how a class implements the child interface by providing implementations for all inherited methods.

    Code sample

    public void show(){System.out.println("Welcome");}
    public static void main(String args[]){
    Testinterface2 obj = new Testinterface2();
    obj.print();
    obj.show();...
  7. Baeldung
    https://www.baeldung.com › java-interfaces

    Java Interfaces - Baeldung

    Jul 23, 2025 · In Java, an interface is an abstract type that contains a collection of methods and constant variables. It is one of the core concepts in Java and is …

  8. Scientech Easy
    https://www.scientecheasy.com › interface-in-java.html

    Interface in Java with Example - Scientech Easy

    Sep 18, 2025 · For example, a bank like HDFC may expose an interface to shopping carts or third-party applications to allow integration without exposing internal …

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  10. codingbootblog.com
    https://codingbootblog.com › posts › java-interface...

    The Complete Java Interface Guide – Real Examples

    Jul 13, 2025 · Learn Java Interface with real-world examples, Java 8 features, inheritance, and interview Q&A. Explained in a clear, student-friendly way.

  11. Guru99
    https://www.guru99.com › interface-in-java.html

    Interface in Java with Example - Guru99

    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 …

  12. Web Reference
    https://webreference.com › java › oop › interfaces

    Java Interfaces Complete Guide with Examples

    Learn Java interfaces including abstract methods, default methods, static methods, functional interfaces, inheritance, and real-world implementation examples.

  13. javaspring.net
    https://www.javaspring.net › blog › interface-example-in-java

    Mastering Interface Examples in Java - javaspring.net

    Nov 12, 2025 · This blog will take you through the ins and outs of interface examples in Java, including fundamental concepts, usage methods, common practices, and best - practices.

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