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

Search Interview Questions


 2807 questions in repository.
 There are more than 200 unanswered questions.
Click here and help us by providing the answer.
 Have a video suggestion.
Click Correct / Improve and please let us know.
Label / Company      Label / Company / Text

   



Core Java - Interview Questions and Answers for 'Immutable objects' - 8 question(s) found - Order By Newest

 Q1. Does Declaring an object "final" makes it immutable ?Core Java
Anonymous
Ans. Only declaring variables as final makes them immutable. Making objects final means that the object handler cannot be used to target some other object but the object is still mutable.

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

   Like      Discuss      Correct / Improve     java   oops   final   immutable   immutable object


 Q2. What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ?Object Oriented Programming
Admin
info@buggybread.com
Ans. Stateless objects are the objects without instance fields (instance variables). The class may have compile time constants i.e static final fields.Immutable objects are the objects which have state but the state cannot be changed after initialization. Both are Thread safe.

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

   Like      Discuss      Correct / Improve     java   stateless objects   immutable objects   objects   singleton scope


 Q3. What are advantages of stateless and / or immutable objects ?Object Oriented Programming
Admin
info@buggybread.com
Ans. They can be shared across multiple threads as they are thread safe.

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

   Like      Discuss      Correct / Improve     java   stateless objects   immutable objects   objects


 Q4. What are the benefits of creating immutable objects ?Core Java2017-01-22 16:01:54

Ans. 1. Security and Safety - They can be shared across multiple threads as they are thread safe. Moreover, it protects then from bad state due to interception by the other code segment. One such problem due to mutability and access by alternate code segment could be the change of hash code and then the impact on its search with hash collections.

2. Reuse - In some cases they can be reused as only one copy would exist and hence it can be relied upon. For example - String Pool

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

   Like      Discuss      Correct / Improve     immutable objects     Knight Capital      Intermediate        frequent


 Q5. What are the examples of immutable objects in Java ?Core Java2017-05-29 08:35:00

Ans. Following Classes in Java SE creates immutable objects

String class
Wrapper Classes like Integer, Float etc.
StackTraceElement
Most Enum classes
File Class
Locale Class

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

   Like      Discuss      Correct / Improve     immutable objects  immutable     Persistent Systems      Basic        frequent


 Q6. What are the drawbacks of creating immutable objects ? Why don't we create all object immutable if mutability possesses so much threat ? Core Java2018-02-10 12:47:43

Ans. Immutable objects relieves us from the problems of inconsistencies and security and helps with better read performance but at the same time are write performance and storage overheads. In case any modification is required , a new object is created and thus creating multiple copies of it.

This is the reason we use StringBuffer / StringBuilder when we have to append some text multiple times and then create a String out of it.

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

   Like      Discuss      Correct / Improve     immutable objects  immutability


 Q7. Does immutability facilitates better performance ?Core Java2018-02-10 12:51:54

Ans. Yes , but only the read performance in case we don't need to modify it much. In case we need to modify it a lot , it creates write performance overheads as we would need to create many news objects instead of just changing one.

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

   Like      Discuss      Correct / Improve     immutable objects  immutability


 Q8. What is immutability and What are it's disadvantages ?Design2018-06-20 12:20:19

 This question was recently asked at 'Bloomberg'.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 objects   immutability     Bloomberg




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: