[Solved] What must a subclass do if it extends an abstract class with abstract methods? — Ans: Implement all abstract methods or be declared abstract itself. | Java

Java - Abstraction

What must a subclass do if it extends an abstract class with abstract methods?

ACall the abstract methods directly without implementation.

BOverride only one abstract method.

CIgnore abstract methods; no implementation needed.

DImplement all abstract methods or be declared abstract itself.

Step-by-Step Solution

Solution:

Step 1: Understand subclass obligations
A subclass must provide implementations for all abstract methods or be declared abstract itself.
Step 2: Evaluate other options
Ignoring or partially implementing abstract methods causes errors, so B, C, and D are incorrect.
Final Answer:
Implement all abstract methods or be declared abstract itself. -> Option D
Quick Check:
Subclass abstract method implementation = A [OK]

Quick Trick: Subclasses must implement all abstract methods or be abstract [OK]

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What must a subclass do if it extends an abstract class with abstract methods?