INTERFACES IN JAVA | OBJECT ORIENTED PROGRAMMING | SNS INSTITUTIONS

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An Interface in Java is an abstract type that defines a set of methods a class must implement.

An interface in Java is a blueprint for a class, defining a contract that implementing classes must adhere to. It is a reference type, similar to a class, but with key distinctions. 

Key Characteristics of Interfaces:

Abstraction: 

Interfaces are used to achieve abstraction. They define a set of abstract methods (methods without a body) that implementing classes must provide concrete implementations for.

No Instantiation: 

Interfaces cannot be instantiated directly; you cannot create objects of an interface type.

Constants: 

Interfaces can declare constants (fields that are implicitly public, static, and final).

Multiple Inheritance: 

Java does not support multiple inheritance of classes, but it allows a class to implement multiple interfaces, effectively achieving a form of multiple inheritance of behavior.

implements Keyword: 

Classes use the implements keyword to declare that they will provide implementations for the methods defined in an interface.

interface Keyword: 

Interfaces are declared using the interface keyword.