If classes C1 and C2 both implement an interface Cint, which has a method whichIsIt, and if C1 c = new C1(); is performed at one point of the program, then a later instruction
c.whichIsIt(); will invoke the whichIsIt method defined in C1.

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The Answer of If classes C1 and C2 both implement an interface Cint, which has a method whichIsIt, and if C1 c = new C1(); is performed at one point of the program, then a later instruction
c.whichIsIt(); will invoke the whichIsIt method defined in C1.

If Classes C1 and C2 Both Implement an Interface Cint