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If I want an object to be notified when another kind of object state changed, which Design Pattern should I use ?
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Overrided method visibility must be the same or less restrictive than the inherited method.6
Can a class implements several interfaces ?3
Explain the difference between overriding and overloading in OOP.9
Inheritance in OOP.2
Which modification of the following code WILL NOT make the output be "success" ?4
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