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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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Writing Classes in Java

There are two meanings of “class”. A class could be: a code library (a collection of methods). For example, java.lang.Math contains methods for performing basic numeric operations. an object data type (a description of a concept). For example, java.lang.String represents

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