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Core Java - Interview Questions and Answers for 'Final class' - 4 question(s) found - Order By Newest

Very Frequently asked.Favorite question in Walk in drive for many Indian service companies.
 Q1. What is a Final Class ?
Anonymous
Ans. A Class that cannot be sub classed.

  Sample Code for final class

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 Q2. Does use of Final class enforces composition over Inheritance in Java ? Core Java2018-07-16 06:49:53

Ans. Yes, to a certain extent. But the objective for Final class could be beyond just enforcing composition as certain classes might have been created without inheritance or composition in mind.

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 Q3. What could be the reasons for restricting inheritance using final class ?Core Java2018-07-16 06:52:00

Ans. 1. Enforcing composition over inheritance
2. Restricting overriding of certain methods
3. Final methods are faster than regular instance methods
4. Enforcing Immutability

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 Q4. Why Java has final class ?Core Java2018-07-10 12:24:27

 This question was recently asked at 'Avis'.This question is still unanswered. Can you please provide an answer.


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 Q5. Which of the following class cannot be extended or inherited ?

StringBuffer , StringBuilder
Core Java
a. StringBuffer
b. StringBuilder
c. Both cannot be extended
d. Both can be extended

Ans.c. Both cannot be extended


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