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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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Explain the difference between overriding and overloading in OOP.3
What does the following code return ?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 ?3
Which modification of the following code WILL NOT make the output be "success" ?