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Interview Questions and Answers - Order By Newest

   
 Q31. Which of the two - compile time and run time polymorphism - requires signature of the method to be different ?Core Java
Ans. runtime polymorphism or method overriding doesn't require method name and signature to be different whereas compile time polymorphism or method overloading requires method name to be same but the signature to be different.

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   Like         Discuss         Correct / Improve     polymorphism  object oriented programming (oops)  oops concepts  overloading  overriding      basic


 Q32. What is "dynamic method dispatch" in java ?Core Java
Ans. dynamic method dispatch is a process in which a call to an
overridden method is resolved at runtime rather than at compile-time. This is used to achieve runtime polymorphism in java.

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 Q33. What is dynamic dispatch in Java ?Core Java
Ans. Dynamic dispatch in java is also known as runtime polymorphism.It is a process in which a call to an overriden method is resolved at runtime.

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 Q34. What happens to private variables during inheritance ?Core Java
Ans. Private variables are not inherited. They are simply ignored and not made part of the derived object body.

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 Q35. How can we hide a class in Java ?Core Java
Ans. By encapsulating it within another class and declaring it private. In such a case, it will only be accessible through parent class or parent class object.

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Very frequently asked. Usually among very first few questions.
 Q36. Define encapsulation in Java ?Core Java
Ans. Encapsulation is a feature of OOP's that binds the data and it's associated methods together as a single unit and facilitate protection and data hiding by providing minimal interface to outside. For example - member variables are declared private and are accessed through public methods. Moreover we have private methods that can only be used internally and hence providing minimal interface to outside class through use of public methods.

  Sample Code for encapsulation

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 Q37. Explain Inheritance and Polymorphism.Core Java
Ans. Getting parent class object properties into child class is called Inheritance.

The process of representing one form into multiple forms is called polymorphism.

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 Q38. Is Runtime Polymorphism possible without Inheritance ?Core Java
Ans. Yes, Runtime Polymprohism requires either Class inheritance or Interface implementation.

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 Q39. What is composition ?Core Java
 This question was recently asked at 'MST Solutions'.This question is still unanswered. Can you please provide an answer.


  Sample Code for composition

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 Q40. What is virtual table with respect to method overriding in Java ?Core Java
 This question is still unanswered. Can you please provide an answer.


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 Q41. How is the virtual method table implemented in Java?Core Java
 This question is still unanswered. Can you please provide an answer.


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 Q42. How many VTables are there for each class ? Core Java
Ans. There is one VTable for each class.

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 Q43. Can a class extend itself in Java ?Core Java
Ans. No

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 Q44. How Object-Oriented Programming is implemented in JavaScript? How they differ from other languages?Javascript
 This question is still unanswered. Can you please provide an answer.


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