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Learn how to use the implements keyword to implement an interface in Java. An interface is an abstract class that groups related methods with empty bodies, and must be implemented by another class.
Nov 1, 2023 · Learn the difference between extends and implements keywords in Java for inheritance and interface implementation. See examples, syntax and table of comparison.
- 36 min
- What Are Interfaces in Java?
- Relationship Between Class and Interface
- Difference Between Class and Interface
- Java Interfaces Examples
- Advantages of Interfaces in Java
- Multiple Inheritance in Java Using Interface
- New Features Added in Interfaces in JDK 8
- Extending Interfaces
- New Features Added in Interfaces in JDK 9
- Important Points in Java Interfaces
The interface in Java is a mechanism to achieve abstraction. Traditionally, an interface could only have abstract methods (methods without a body) and public, static, and final variables by default. It is used to achieve abstraction and multiple inheritances in Java. In other words, interfaces primarily define methods that other classes must implem...
A class can extend another class, and similarly, an interface can extend another interface. However, only a class can implement an interface, and the reverse (an interface implementing a class) is not allowed.
Although Class and Interface seem the same there have certain differences between Classes and Interface. The major differences between a class and an interface are mentioned below:
Let’s consider the example of vehicles like bicycles, cars, bikes, etc they have common functionalities. So we make an interface and put all these common functionalities. And lets Bicycle, Bike, car, etc implement all these functionalities in their own class in their own way. Below is the implementation of the above topic:
The advantages of using interfaces in Java are as follows: 1. Without bothering about the implementation part, we can achieve the security of the implementation. 2. In Java, multiple inheritances are not allowed, however, you can use an interface to make use of it as you can implement more than one interface.
Multiple Inheritance is an OOPs concept that can’t be implemented in Java using classes. But we can use multiple inheritances in Java using Interface. let us check this with an example. Example:
There are certain features added to Interfaces in JDK 8 update mentioned below: 1. Prior to JDK 8, the interface could not define the implementation. We can now add default implementation for interface methods. This default implementation has a special use and does not affect the intention behind interfaces. Suppose we need to add a new function to...
One interface can inherit another by the use of keyword extends. When a class implements an interface that inherits another interface, it must provide an implementation for all methods required by the interface inheritance chain. Program 1: Program 2: In a Simple way, the interface contains multiple abstract methods, so write the implementation in ...
From Java 9 onwards, interfaces can contain the following also: 1. Static methods 2. Private methods 3. Private Static methods
In the article, we learn certain important points about interfaces as mentioned below: 1. We can’t create an instance (interface can’t be instantiated) of the interface but we can make the reference of it that refers to the Object of its implementing class. 2. A class can implement more than one interface. 3. An interface can extend to another inte...
People also ask
How to implement interface in Java?
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Learn how to declare a class that implements an interface, such as Relatable, which defines how to compare the size of objects. See an example of RectanglePlus class that implements Relatable and overrides the isLargerThan method.
Learn what an interface is in Java, how to create and implement one, and how to extend and use multiple interfaces. Also, explore default methods, static methods and private methods in interfaces.
Learn how to declare a class that implements an interface in Java, and how to use default methods to add new functionality to interfaces without breaking existing code. See examples of interfaces for comparing objects, controlling cars, and accessing time and date.
The implements keyword in Java is used to indicate that a class is going to implement an interface. By using implements, a class agrees to provide concrete implementations for all the abstract methods declared in the interface. Usage.
