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Introduction to Interface in Java with Solved Examples
Why use Interfaces?
Similar to abstract classes, interfaces help us to achieve abstraction in Java.
In Java, multiple inheritance is not possible by extending classes. However, a class can implement multiple interfaces. Interfaces are also used to achieve multiple inheritance in Java. If a subclass is inherited from two or more classes, it's multiple inheritance.
Interfaces provide specifications that a class (which implements it) must follow.
private and static Methods in Interface
With the release of Java 8, interfaces now can include static methods.
Similar to a class, we can access static methods of an interface using its references.
default methods in Interfaces
With the release of Java 8, methods with implementation (default methods) were introduced inside an interface. Before that, all the methods were abstract in Java.
To declare default methods inside interfaces, we use the default keyword.
extends Keyword in Interface
Similar to classes, interfaces can extend other interfaces. The extends keyword is used for extending interfaces.
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Why Java Abstraction?
Abstraction is an important concept of object-oriented programming. Abstraction only shows the needed information and all the unnecessary details are kept hidden. This allows us to manage complexity by omitting or hiding details with a simpler, higher-level idea.
The major advantage of hiding the working of the brake is that now the manufacturer can implement brake differently for different motorbikes, however, what brake does will be the same.
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