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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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Can a class implements several interfaces ?4
When can you do a+b in OOP ?3
Explain the difference between overriding and overloading in OOP.3
Which modification of the following code WILL NOT make the output be "success" ?9
Inheritance in OOP.3
What does the following code return ?11
Overrided method visibility must be the same or less restrictive than the inherited method.