Interview Questions and Answers for 'Set' | Search Interview Question - javasearch.buggybread.com
Javasearch.buggybread.com

Search Interview Questions


 More than 3000 questions in repository.
 There are more than 900 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

   



Interview Questions and Answers for 'Set' - 48 question(s) found - Order By Rating

next 30
 Q1. Difference between XSS and CSRF ?Security
Ans. SRF attack requires an authenticated session, whereas an XSS attack doesn’t.
XSS doesn’t require any user interaction.CSRF is restricted to the actions the victim can perform.
XSS requires a vulnerability to happen, whereas CSRF relies on tricking the user to click a link or access a page.
CSRF can only send an HTTP request but cannot view the response. XSS can send and receive HTTP requests and responses to extract the required data.

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

   Like         Discuss         Correct / Improve     xss attack  csrf attack  security vulnerabilities  security attack  web security     Asked in 3 Companies

 Q2. Write a program to make an array act as a set.Core Java
Ans. public Set convertArrayToList(T array[]) {
Set set = new HashSet<>(Arrays.asList(array));
return set;
}

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

   Like         Discuss         Correct / Improve     arrays  collections set     Asked in 1 Companies

 Q3. Difference between ArrayList and HashSet ?Core Java
Ans. ArrayList is a list , i.e an implementation of List interface whereas HashSet is a Set and an implementation of Set interface.

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

   Like         Discuss         Correct / Improve     arraylist  hashset

 Q4. Can we ssh into subnet without a internet gateway ?Amazon Web Services (AWS)
Ans. No

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

   Like         Discuss         Correct / Improve     aws subset  aws internet gateway

 Q5. How to run jar file using command promptCore Java
 This question was recently asked at 'CIGNEX Datamatics'.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     jar  running jar using command line  cron entry   setting java app as cron     Asked in 1 Companies

 Q6. How to sort objects based on one of the field ?Core Java
Ans. Using comparable and comparator and sorted collections like TreeSet or TreeMap.

or

use stream api from java 8 onwards which internally refers to comparable and comparator through lambda expressions

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

   Like         Discuss         Correct / Improve     sort  sorting  comprator  comparable  treeset  treemap  sorting collections     Asked in 1 Companies      Basic        frequent

 Q7. What is the difference between TreeSet and TreeMap ?Core Java
Ans. TreeSet contains only values as elements whereas TreeMap contains Key value pairs.

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

   Like         Discuss         Correct / Improve     reeMap  TreeSet  Collections  sorted collection     Asked in 1 Companies        rare

 Q8. What is setter injection ?Spring
Ans. Setter Injection in Spring is a type of dependency injection in which the framework injects the dependent objects into the client using a setter method.

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

   Like         Discuss         Correct / Improve     setter injection   dependency injection     Asked in 2 Companies

 Q9. As root, if you have to assign the owner for the file and set only read permission for the owner, Write a unix command to do it.Unix
Ans. chmod 477

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

   Like         Discuss         Correct / Improve     unix commands  setting file permissions  chown  chmod

 Q10. How can we set a key within Redis ?Redis
Ans. SET <KEY_NAME> <VALUE>

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

   Like         Discuss         Correct / Improve     redis  setting a key

 Q11. What is the quickest way to find count of duplicate elements in an arraylist, without using iteration or loops ?Core Java
Ans. We can copy the elements to a Set and then find the difference of count between ArrayList and Set. As Set don't allow duplicates , they will be removed in the set.

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

   Like         Discuss         Correct / Improve     collections  arraylist  set

 Q12. What is a mutator in Java?Core Java
Ans. Mutator is another name for setter methods, i.e the method allows for mutating the property of an object and eventually the state of the object.

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

   Like         Discuss         Correct / Improve     setter method  mutator

  Q13. What are the core OOPs concepts ?Core Java
Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance

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

   Like         Discuss         Correct / Improve     core oops concepts     Asked in 65 Companies      basic        frequent

 Q14. What is an Asset store ?IBM WCS
Ans. Asset stores are collections of sharable resources (business artifacts, business processes and storefront assets) that can be leveraged in other stores.

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

   Like         Discuss         Correct / Improve     asset store

Frequently asked in Accenture.
  Q15. What is your biggest achievement at work ?General
Ans. [Open Ended Answer]

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

   Like         Discuss         Correct / Improve     general question  non technical question     Asked in 20 Companies        frequent

Frequently asked in Alibaba (Based on 2 feedback)
 Q16. What is the best Memory setting for JVM ?Core Java
Ans. In Java JVM memory settings is done by use the arguments -Xms -Xmx. Use M or G after the numbers for indicating Megs and Gigs of bytes respectively. -Xms indicates the minimum and -Xmx the maximum.

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

   Like         Discuss         Correct / Improve     jvm  memory management  jvm best memory setting     Asked in 1 Companies      intermediate

 Q17. Difference beween HashSet and TreeSet ?Core Java
Ans. 1. HashSet doesnt maintain its elements in any specific order and is all random whereas TreeSet maintains elements in natural order 9 order defined by the equals method of TreeSet element type )

2. TreeSet doesnt allow null elements whereas HashMap does.

3. As TreeSet orders elements and is hence insertion is comparatively slower.

4. HashSet performs basic operations like add(), remove(), contains(), size() etc. in a constant size time. A TreeSet performs these operations at the order of log(n) time.

5. HashMap in Java internally backs a HashSet. A NavigableMap backs a TreeSet internally.

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

   Like         Discuss         Correct / Improve     collections  hashset  treeset  set   hashet vs treeset     Asked in 4 Companies      Basic        frequent
Try 1 Question(s) Test

Basic and Very Frequently asked.
  Q18. What is Polymorphism in Java ?Core Java
Ans. Polymorphism means the condition of occurring in several different forms.

Polymorphism in Java is achieved in two manners

1. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas

2. Dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding.

  Sample Code for overloading

  Sample Code for overriding

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

   Like         Discuss         Correct / Improve     polymorphism  object oriented programming (oops)  oops concepts  oops concepts     Asked in 108 Companies      Basic        frequent
Try 2 Question(s) Test

 Q19. Is it advisable to set the member variables through constructors instead of setting them through setters ?
Ans. Yes , If the values to be set are known at the time of initialization and doesn't involve polymorphic behavior.If it's using Dependency Injection , then Constructor injection must be available. If it suffice the above conditions, then definitely its advisable to have them set through constructor as they eagerly load the values into the memory and save it fro multiple values assignment ( one through default constructor and then through assignment )

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

   Like         Discuss         Correct / Improve     constructor  setter vs constructor

Frequently asked in Indian Service Companies. Tech Mahindra ( Based on 3 inputs ) and Infosys ( 3 inputs )
  Q20. What is the difference between List, Set and Map ?

or

What are the different Java Collections Interfaces ?		Core Java
Ans. List - Members are stored in sequence in memory and can be accessed through index.
Set - There is no relevance of sequence and index. Sets doesn't contain duplicates whereas multiset can have duplicates.
Map - Contains Key , Value pairs.

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

   Like         Discuss         Correct / Improve     java   collections   list   set   map   list vs set vs map     Asked in 8 Companies      basic        frequent
Try 1 Question(s) Test

 Q21. Explain Set Interface?Core Java
Ans. It is a collection of element which cannot contain duplicate elements. The Set interface contains only methods inherited from Collection and adds the restriction that duplicate elements are prohibited.

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

   Like         Discuss         Correct / Improve     java   collections   set interface   set

 Q22. What is the best practice configuration usage for files - pom.xml or settings.xml ?Maven
Ans. The best practice guideline between settings.xml and pom.xml is that configurations in settings.xml must be specific to the current user and that pom.xml configurations are specific to the project.

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

   Like         Discuss         Correct / Improve     maven   build technologies   pom.xml   settings.xml   architecture   technical architect   technical lead   build management   build and release
Try 1 Question(s) Test

 Q23. What ate the getter and setter methods ?
Ans. getters and setters methods are used to store and manipulate the private variables in java beans. A getters as it has name, suggest retrieves the attribute of the same name. A setters are allows you to set the values of the attributes.

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

   Like         Discuss         Correct / Improve     java   java beans   getter   setter

 Q24. Can we use Ordered Set for performing Binary Search ?
Ans. We need to access values on the basis of an index in Binary search which is not possible with Sets.

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

   Like         Discuss         Correct / Improve     java   sets   set   collections   binary search

 Q25. What is comparator interface used for ?Core Java
Ans. The purpose of comparator interface is to compare objects of the same class to identify the sorting order. Sorted Collection Classes ( TreeSet, TreeMap ) have been designed such to look for this method to identify the sorting order, that is why class need to implement Comparator interface to qualify its objects to be part of Sorted Collections.

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

   Like         Discuss         Correct / Improve     java   collections   treemap   treeset   comparator     Asked in 2 Companies      Intermediate
Try 2 Question(s) Test

 Q26. Which are the sorted collections ?Core Java
Ans. TreeSet and TreeMap

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

   Like         Discuss         Correct / Improve     java   collections   treemap   treeset   basic interview question      basic        frequent

 Q27. Why are Getter and Setter better than directly changing and retrieving fields ?

or

What is the significance of variable hiding in Java ?

or

Why it's preferred to keep variables private and allow their access through getter and setter methods ?		Core Java
Ans. 1. Methods can participate in runtime polymorphism whereas member variables cannot.

For example -

Vehicle vehicle = new Car();

car.getObjVariable();// will return variable defined in Car

whereas

car.variable

will return the variable from Car class irrespective of the object it holds.

2. Validations can be performed before setting the variables.

3. If the input format changes or some other value or calculated value needs to be returned , that can be absorbed by making change ( wrapping ) in the setter and getter. By this the call to method from outside or interface to the object will remain the same.

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

   Like         Discuss         Correct / Improve     java   beans   getter   setter

Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q28. What is the difference between ArrayList and LinkedList ?Core Java
Ans. Underlying data structure for ArrayList is Array whereas LinkedList is the linked list and hence have following differences -

1. ArrayList needs continuous memory locations and hence need to be moved to a bigger space if new elements are to be added to a filled array which is not required for LinkedList.

2. Removal and Insertion at specific place in ArrayList requires moving all elements and hence leads to O(n) insertions and removal whereas its constant O(1) for LinkedList.

3. Random access using index in ArrayList is faster than LinkedList which requires traversing the complete list through references.

4. Though Linear Search takes Similar Time for both, Binary Search using LinkedList requires creating new Model called Binary Search Tree which is slower but offers constant time insertion and deletion.

5. For a set of integers you want to sort using quicksort, it's probably faster to use an array; for a set of large structures you want to sort using selection sort, a linked list will be faster.

  Sample Code for ArrayList

  Sample Code for LinkedList

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

   Like         Discuss         Correct / Improve     collections   java   data structures   arraylist   linkedlist   arraylist vs linkedlist     Asked in 61 Companies      Basic        frequent
Try 1 Question(s) Test

Frequently asked question in companies using Hibernate.
  Q29. What is Lazy Initialization in Hibernate ?Hibernate
Ans. It's a feature to lazily initialize dependencies , relationship and associations from the Database. Any related references marked as @OneToMany or @ManyToMany are loaded lazily i.e when they are accessed and not when the parent is loaded.

  Sample Code for Lazy Initialization

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

   Like         Discuss         Correct / Improve     hibernate   lazy loading hibernate   lazy initialization hibernate   architecture     Asked in 77 Companies      Basic        frequent
Try 2 Question(s) Test

Frequently asked at Manhattan Associates ( Based on 2 feedback )
  Q30. What is a Lambda Expression ? What's its use ?Core Java
Ans. Its an anonymous method without any declaration.

Lambda Expression are useful to write shorthand Code and hence saves the effort of writing lengthy Code.

It promotes Developer productivity, Better Readable and Reliable code.

  Sample Code for lambda

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

   Like         Discuss         Correct / Improve     java   java8   lambda expression   architecture     Asked in 58 Companies      expert        frequent
Try 1 Question(s) Test

next 30

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: