[Solved] Identify the error in this code snippet:class Animal {} class Dog extends Animal {} public class Test { public static void main(String[] args) { Animal a = new Animal(); Dog d = (Dog) a; } } | Java

Java - Polymorphism

Identify the error in this code snippet:

class Animal {} class Dog extends Animal {} public class Test { public static void main(String[] args) { Animal a = new Animal(); Dog d = (Dog) a; } }

ANo error, code runs fine

BCompilation error due to invalid cast

CRuntime ClassCastException occurs

DDog cannot extend Animal

Step-by-Step Solution

Solution:

Step 1: Analyze casting from superclass instance
'a' refers to an Animal object, not a Dog instance.
Step 2: Understand runtime casting rules
Downcasting Animal to Dog compiles but causes ClassCastException at runtime.
Final Answer:
Runtime ClassCastException occurs -> Option C
Quick Check:
Downcasting superclass instance to subclass causes runtime error [OK]

Quick Trick: Downcast superclass instance to subclass causes runtime error [OK]

Common Mistakes:

Expecting compile-time error instead of runtime error
Assuming cast changes actual object type
Ignoring need to check object type before downcast

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More Java Quizzes

Identify the error in this code snippet:

Step 1: Analyze casting from superclass instance

Step 2: Understand runtime casting rules

Final Answer:

Quick Check:

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