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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.4
When can you do a+b in OOP ?3
What does the following code return ?9
Inheritance in OOP.3
Explain the difference between overriding and overloading in OOP.2
Which modification of the following code WILL NOT make the output be "success" ?6
Can a class implements several interfaces ?