Solution:Step 1: Check return types in parent and child methodsParent returns Number, child returns Integer, which is a subclass of Number.Step 2: Understand covariant return types in Java overridingJava allows child methods to return a subtype of the parent's return type when overriding.Final Answe

[Solved] Consider this code:class Animal { Number getValue() { return 10; } } class Dog extends Animal { @Override Integer getValue() { return 20; } }Which statement about this overriding is correct? | Java

Java - Polymorphism

Consider this code:

class Animal {
    Number getValue() { return 10; }
}
class Dog extends Animal {
    @Override
    Integer getValue() { return 20; }
}

Which statement about this overriding is correct?

AThis is valid because Integer is a subclass of Number (covariant return type).

BThis causes a compile-time error due to different return types.

CThis is invalid because return types must be exactly the same.

DThis is invalid because @Override cannot be used with different return types.

Step-by-Step Solution

Solution:

Step 1: Check return types in parent and child methods
Parent returns Number, child returns Integer, which is a subclass of Number.
Step 2: Understand covariant return types in Java overriding
Java allows child methods to return a subtype of the parent's return type when overriding.
Final Answer:
This is valid because Integer is a subclass of Number (covariant return type). -> Option A
Quick Check:
Covariant return types allowed = A [OK]

Quick Trick: Child can return subtype of parent's return type when overriding [OK]

Common Mistakes:

Thinking return types must be exactly the same
Assuming @Override forbids different return types
Confusing overloading with overriding

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Consider this code:

Step 1: Check return types in parent and child methods

Step 2: Understand covariant return types in Java overriding

Final Answer:

Quick Check:

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