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Which statement best describes upcasting in Java?

easy📝 Conceptual Q1 of 15
Java - Polymorphism
Which statement best describes upcasting in Java?
AConverting a superclass object to a subclass reference type.
BCasting between unrelated classes.
CChanging the data type of a primitive variable.
DConverting a subclass object to a superclass reference type.
Step-by-Step Solution
Solution:

  1. Step 1: Understand class hierarchy

    Upcasting means treating a subclass object as an instance of its superclass.

  2. Step 2: Identify correct casting direction

    Upcasting converts subclass to superclass reference, which is safe and implicit.

  3. Final Answer:

    Converting a subclass object to a superclass reference type. -> Option D

  4. Quick Check:

    Upcasting = subclass to superclass [OK]
Quick Trick: Upcasting is subclass to superclass reference [OK]
Common Mistakes:
  • Confusing upcasting with downcasting
  • Thinking upcasting changes the actual object type
  • Assuming upcasting requires explicit cast

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