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If I want to instantiate objects with a type which is derivated from an abstract type, which Design Patter should I use ?
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10
Inheritance in OOP.13
Overrided method visibility must be the same or less restrictive than the inherited method.7
Can a class implements several interfaces ?5
When can you do a+b in OOP ?4
Explain the difference between overriding and overloading in OOP.3
Which modification of the following code WILL NOT make the output be "success" ?3
What does the following code return ?