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  Interface in Java What is Interfaces Another way to achieve abstraction in Java, is with interfaces. It’s a blueprint of a class, which tells by class what to do not how to do. An interface is a completely "abstract class" that is used to group related methods with empty bodies.  Features of Interfaces It is used to achieve abstraction. It supports multiple inheritance. It can be used to achieve loose coupling Like abstract classes, interfaces cannot be used to create objects Interface methods do not have a body - the body is provided by the "implement" class On implementation of an interface, you must override all of its methods Interface methods are by default abstract and public Interface attributes are by default public, static and final An interface cannot contain a constructor (as it cannot be used to create objects) Why and When to use Interfaces 1) To achieve security - hide certain details and only show the important details of an object (interface)....