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 Q31. What happens to private variables during inheritance ?Core Java2017-06-07 16:35:35

Ans. Private variables are not inherited. They are simply ignored and not made part of the derived object body.

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 Q32. How can we hide a class in Java ?Core Java2017-06-07 16:42:57

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.
 Q33. Define encapsulation in Java ?Core Java2017-06-12 07:55:47

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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 Q34. Explain Inheritance and Polymorphism.Core Java2017-07-10 14:27:40

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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 Q35. Is Runtime Polymorphism possible without Inheritance ?Core Java2017-08-06 19:12:26

Ans. Yes, Runtime Polymprohism requires either Class inheritance or Interface implementation.

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 Q36. What is composition ?Core Java2018-01-20 12:20:35

 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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 Q37. What is virtual table with respect to method overriding in Java ?Core Java2018-07-16 06:54:03

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 Q38. How is the virtual method table implemented in Java?Core Java2018-07-16 07:55:56

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 Q39. How many VTables are there for each class ? Core Java2018-07-16 07:57:04

Ans. There is one VTable for each class.

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 Q40. Can a class extend itself in Java ?Core Java2018-07-20 18:16:21

Ans. No

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