Introduction
In the world of Java programming, interfaces play a vital role in achieving abstraction and enabling polymorphic behaviour. Java interfaces provide a way to declare a set of methods that a class must implement, allowing for loose coupling and code reusability. We will dive into the concept of interfaces in Java, their syntax, and their benefits.
Understanding Java Interface
In Java, an interface is a collection of abstract methods, constants, and default methods. It is used as a blueprint for a class, which need to implement the interface. An interface declaration begins with the 'interface' keyword and can include a method signature without method bodies.
Implementing an interface
To implement an interface in Java, a class must use the 'implements' keyword followed by the interface name. The implementing class must provide implementations for all the methods defined in the interface.
Benefits of Interface:
Abstraction and Loose Coupling: Interface provide a way to achieve abstraction, separating the declaration of methods from implementations. This allows for loose coupling between classes, making the code more flexible, maintainable, and easily extensible.
Multiple Inheritance: Unlike classes, Java allows a class to implement multiple interfaces, enabling a form of multiple inheritances.
Polymorphism: Interfaces are key to achieving polymorphic behavior in Java. You can write code that works with different classes that share a common interface.
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