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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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What does the following code return ?3
Which modification of the following code WILL NOT make the output be "success" ?7
Can a class implements several interfaces ?4
Explain the difference between overriding and overloading in OOP.5
When can you do a+b in OOP ?10
Inheritance in OOP.12
Overrided method visibility must be the same or less restrictive than the inherited method.