Core Java - Interview Questions and Answers for 'Final class' | Search Java Interview Question

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

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops final final class java keyword basic interview question Asked in 3 Companies basic frequent}

Q2. Does use of Final class enforces composition over Inheritance in Java ?

Core Java

^{2018-07-16 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve final class composition object oriented programming (oops) oops concepts inheritance object oriented programming (oops) oops concepts composition object oriented programming (oops) oops concepts vs inheritance object oriented programming (oops) oops concepts expert}

Q3. What could be the reasons for restricting inheritance using final class ?

Core Java

^{2018-07-16 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

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve final class reasons for final class restricting inheritance object oriented programming (oops) oops concepts expert}

Q4. Why Java has final class ?

Core Java

^{2018-07-10 12:24:27}

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

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve final class final keyword Asked in 1 Companies basic}

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

Search Interview Questions

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.