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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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Which modification of the following code WILL NOT make the output be "success" ?3
What does the following code return ?4
Explain the difference between overriding and overloading in OOP.5
When can you do a+b in OOP ?13
Overrided method visibility must be the same or less restrictive than the inherited method.10
Inheritance in OOP.7
Can a class implements several interfaces ?