What is data abstraction? what are the three levels of data abstraction with Example?
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Why are virtual users created?
Explain about object oriented programming?
What is sealed modifiers?
What's the main difference between arraylist / hashmap and vector / hashtable?
Do we require a parameter for constructors?
Differentiate between an abstract class and an interface?
explain dynamic binding
What is an interface?
Explain static binding
Is iterator a class or interface? What is its use?
What are the problems faced by the developer using object oriented programming language?
What is the difference between an interface and abstract class?