Java - Interview Questions and Answers for 'Immutable class' | Search Java Interview Question - javasearch.buggybread.com
Javasearch.buggybread.com
Share

Search Java Interview Questions


 2137 questions in repository.
 There are more than 200 unanswered questions.
Click here and help us by providing the answer.
Label / Company      Label / Company / Text

   



Interview Questions and Answers for 'Immutable class' - 6 question(s) found - Order By Newest

Very Frequently asked. Usually asked along with String Class related questions.
 Q1. What is an immutable class ?Core Java
Anonymous
Ans. Class using which only immutable (objects that cannot be changed after initialization) objects can be created.

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

   Like      Discuss      Correct / Improve     java   oops   immutable   immutable class   string class   basic interview question   ebay     Cognizant (CTS)  Hybris  YuMe  ebizAutos      Basic        frequent

Try 2 Question(s) Test


 Q2. How to implement an immutable class ?Core Java
Anonymous
Ans. We can make a class immutable by

1. Making all methods and variables as private.

2. Setting variables within constructor.

Public Class ImmutableClass{

private int member;
ImmutableClass(int var){
member=var;
}
}

and then we can initialize the object of the class as

ImmutableClass immutableObject = new ImmutableClass(5);

Now all members being private , you cant change the state of the object.

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

   Like      Discuss      Correct / Improve     java   oops   immutable   immutable class   technical lead     Deloitte  Pramati Technologies  JPMorgan Chase  Mastercard      intermediate        frequent

Try 2 Question(s) Test


 Q3. Make the following class immutable

public class Employee {

   private long employeeId;

   private String employeeName;

   public long getEmployeeId() {
      return employeeId;
   }

public void setEmployeeId(long employeeId) {
      this.employeeId = employeeId;
   }

   public String getEmployeeName() {
      return employeeName;
   }

public void setEmployeeName(String employeeName) {
      this.employeeName = employeeName;
   }
}
Core Java2017-05-15 10:09:35

Ans. public class Employee {

   private long employeeId;

   private String employeeName;

   public Employee(long employeeId,String employeeName){
      this.employeeId = employeeId;
      this.employeeName = employeeName;
   }

   public long getEmployeeId() {
      return employeeId;
   }

   public long getEmployeeName() {
      return employeeName;
   }
}

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

   Like      Discuss      Correct / Improve     immutable  immutable class


 Q4. Is immutability an advantage with Wrapper classes over primitive types ? Core Java2017-08-24 21:43:19

Ans. There is no concept of de referencing with primitive types and hence they are implicitly immutable. Having wrapper classes as mutable offers disadvantages compared to primitive types. Wrapper classes being immutable offer similar advantage as primitive types.It actually overshadows the disadvantage wrapper class could have if they are immutable.

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

   Like      Discuss      Correct / Improve     immutable classes  wrapper classes


 Q5. Which immutable classes have you worked with ? Can you name some immutable Collections ? How to make an immutable collection ?Core Java2017-08-28 17:11:22

 This question was recently asked at 'Ancestry,HCL Technologies,Tata Consultancy (TCS)'.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     immutability  immutable classes   immutable collections     Ancestry  HCL Technologies  Tata Consultancy (TCS)


 Q6. What are the benefits of immutability or Immutable classes ?Core Java2017-08-28 19:36:18

 This question was recently asked at 'Ancestry'.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     immutable classes   benefits of immutable classes     Ancestry




Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner



comments powered by Disqus
 

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

Any input from you will be highly appreciated and It will unlock the application for 10 more requests.

Company Name:
Questions Asked:
         

X Close this

X Close this

Help Us Improve.
Please share your
interview experience.

Company Name:   


Questions Asked: