[Solved] Consider an abstract class Processor with an abstract method process(). You want to create a subclass DataProcessor that implements process() and also adds a new method validate().... | PHP

PHP - Inheritance and Polymorphism

Consider an abstract class Processor with an abstract method process(). You want to create a subclass DataProcessor that implements process() and also adds a new method validate(). Which statement is true?

ADataProcessor must implement process() and can add validate() freely.

BDataProcessor cannot add new methods beyond abstract ones.

CDataProcessor must declare validate() as abstract too.

DDataProcessor must override all methods from Processor including validate().

Step-by-Step Solution

Solution:

Step 1: Understand abstract method implementation
Subclass must implement all abstract methods from parent.
Step 2: Adding new methods in subclass
Subclass can add any new methods beyond abstract ones freely.
Final Answer:
DataProcessor must implement process() and can add validate() freely. -> Option A
Quick Check:
Subclass can add new methods beyond abstract ones [OK]

Quick Trick: Abstract methods must be implemented; new methods are allowed [OK]

Common Mistakes:

Thinking subclass cannot add new methods
Assuming new methods must be abstract
Confusing method overriding with adding

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More PHP Quizzes

Which statement is true?

Step 1: Understand abstract method implementation

Step 2: Adding new methods in subclass

Final Answer:

Quick Check:

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