Core Java · interview question
Why does upcasting an object in terms of method accessibility change runtime behavior?
Multiple choiceMediumchapter-5-curatedpremiumcore-javaupcasting-and-dynamic-dispatch
Answer and explanation
Correct answer
C. Only the methods defined in the reference type are accessible.
Why
When an object is upcasted, only the methods defined in the reference type (superclass or interface) are accessible. However, overridden methods in the subclass are invoked if called through these accessible methods.
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