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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" ?5
When can you do a+b in OOP ?4
What does the following code return ?7
Can a class implements several interfaces ?12
Overrided method visibility must be the same or less restrictive than the inherited method.10
Inheritance in OOP.4
Explain the difference between overriding and overloading in OOP.