Upcasting & Dispatch

Core JavaTopic 16 of 322 questions

Q1Explain B b = new A() vs A a = new B() with upcasting

Upcasting (child to parent reference) is implicit and safe. Downcasting (parent to child reference) requires an explicit cast and risks ClassCastException. The object type decides which method runs.

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Q2What is a base class and how does it differ from a derived class?

A base class defines shared state and behavior. A derived class extends it, inheriting everything and adding or overriding specific behavior. This is the IS-A relationship.

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