How do you define a class interface?

An interface is declared by using the interface keyword . It provides total abstraction; means all the methods in an interface are declared with the empty body, and all the fields are public, static and final by default. A class that implements an interface must implement all the methods declared in the interface.

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How do you define a class interface?

An interface is declared by using the interface keyword . It provides total abstraction; means all the methods in an interface are declared with the empty body, and all the fields are public, static and final by default. A class that implements an interface must implement all the methods declared in the interface.

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What is concrete method?

A concrete method means, the method has complete definition but it can be overridden in the inherited class . If we make this method “final” then it can not be overriden. Declaring a method or class “final” means its implementation is complete.

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