Which of the following Java code snippets correctly demonstrates polymorphism?

easy📝 Syntax Q12 of 15

Java - Polymorphism

ADog d = new Animal(); d.sound();

BDog d = new Dog(); d.bark();

CAnimal a = new Animal(); a.sound();

DAnimal a = new Dog(); a.sound();

Step-by-Step Solution

Solution:

Step 1: Check object assignment compatibility
Polymorphism allows a superclass reference to point to a subclass object, like Animal a = new Dog();
Step 2: Verify method call correctness
Calling a method on the superclass reference that is overridden in subclass shows polymorphism.
Final Answer:
Animal a = new Dog(); a.sound(); -> Option D
Quick Check:
Superclass ref to subclass object = polymorphism [OK]

Quick Trick: Superclass reference can hold subclass object [OK]

Common Mistakes:

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