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

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

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Q1. What is a Final Class ?

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 Java

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 Java

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 Java

^{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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