Core Java - Interview Questions and Answers for 'Private constructor' | Search Interview Question

Core Java - Interview Questions and Answers for 'Private constructor' - 4 question(s) found - Order By Rating

Q1. Can we instantiate the object of derived class if parent constructor is private ?

Core Java

Ans. No

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Q2. Can a constructor have a private access specifier ?

Core Java

Ans. Yes, declaring a constructor private means disabling the creation of object that way using new operator.

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Q3. Have you ever felt the need of keeping the constructor private ?

Design

Ans. Yes, When either we don't want an object to be created ( class having all static elements and hence not required ) or object to be created using a static method or static block. One such example could be a situation when we would like app to load objects at start up and we would like to restrict new object creation by any request.

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Q4. Can we instantiate the object of derived class if parent constructor is protected ?

Core Java

Ans. Yes, as protected constructor is accessible in sub class.

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Q5. How can we create objects if we make the constructor private ?

Core Java

a. We can't create objects if constructor is private

b. We can only create objects if we follow singleton pattern

c. We can only create one object

d. We can create new object through static method or static block

Ans.d. We can create new object through static method or static block

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