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Which concept of OOP allows to create a class which can not be instantiated ?
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3
What does the following code return ?4
When can you do a+b in OOP ?3
Explain the difference between overriding and overloading in OOP.6
Can a class implements several interfaces ?9
Inheritance in OOP.2
Which modification of the following code WILL NOT make the output be "success" ?11
Overrided method visibility must be the same or less restrictive than the inherited method.