COME ON I HEARD "YOU CAN SPECIFY WHAT CLASS SHOULD DO,NOT HOW".BUT WITHOUT INTERFACE ,EXTREME JAVA PROJECTS CAN BE MADE!! WHY TO MAKE COMPLICATION USING INTERFACE?
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An interface defines a set of methods that must be implemented by any class that implements the interface. Eg You could define an interface with a calculateArea method. Then define all kinds of shape classes (Square, Circle etc) that implement the interface. Those classes may have a common Shape superclass, …
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