What is the difference between an Abstract class and Interface?
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Give any criteria when you use an abstract class and an interface?
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What are sealed modifiers?
What are the basic concepts of oop?
Differentiate between an abstract class and an interface?
What do you mean by polymorphism?
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In winform my controls [taskbar and progressbar] become inactive when heavy processing is going in background, how to avoid this via multithreading
What is the use if instanceof keyword? And how do refer to a current instance of object?
Define a good interface?
What is the difference between a virtual method and an abstract method?
What is the difference between new and override?
Can you create an instance of an interface?
What is the main use of message metaphor in object-oriented programming?