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Interfaces in Java

An interface in Java represents an abstract type; it is a collection of abstract methods and constants. All methods in an interface are abstract, and thus they have only signatures. All variables in an interface are implicitly final and static,

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Polymorphism in Java

A polymorphic reference is a variable that can refer to different types of objects. A reference can refer to an object of its class, or to an object of any subclass. When we call a method through a polymorphic reference,

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