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A child class B of an abstract class A must define the abstract methods of A.
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Overrided method visibility must be the same or less restrictive than the inherited method.10
Inheritance in OOP.3
What does the following code return ?3
Which modification of the following code WILL NOT make the output be "success" ?7
Can a class implements several interfaces ?4
Explain the difference between overriding and overloading in OOP.5
When can you do a+b in OOP ?