Interfaces allow us to make polymorphic references, in which the method that is invoked is based on the type of the reference variable rather than the particular object being referenced at the time.

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In polymorphism, the method invoked is based on the actual object's type, not the reference variable's type. Interfaces allow polymorphic behavior by letting different classes implement the same interface, but the method executed is determined by the object's class.

Interfaces Allow Us to Make Polymorphic References, in Which the Method