Interview Questions and Answers for 'Set' | Search Interview Question

Interview Questions and Answers - Order By Newest

Q31. What is unmodifiable set / unmodifiable map ? How can we create one ?

Ans. It is an unmodifiable / read only view of the underlying collection. We can use

Collections.unmodifiableSet(Set set)
Collections.unmodifiableMap(Map map)
Collections.unmodifiableCollection(Collection collection)

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

_{Like Discuss Correct / Improve collections set unmodifiable set map unmodifiable map unmodifiablemap unmodifiableset Collections.unmodifiableCollection Collections.unmodifiableMap Collections.unmodifiableSet}

Q32. 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 Alibaba (Based on 2 feedback)

Q33. 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}

Frequently asked in Accenture.

Q34. 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}

Q35. 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}

Q36. 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}

Q37. 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}

Q38. 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}

Q39. 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}

Q40. 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}

Q41. 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}

Q42. 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}

Q43. 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}

Q44. How to run jar file using command prompt

Core 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}

Q45. 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}

Q46. 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}

Q47. 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}

Q48. 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}

Q49. What will be the output upon executing main method ?

public static void main(String[] args){
      Set set = new HashSet();
      set.add(1);
      set.add(2);
      set.add(3);
      System.out.println(set);
   }

Core Java

a. 1,2,3

b. Order cannot be determined

c. Compilation error

d. 3,2,1

Ans.b. Order cannot be determined

Q50. Which of following stores its elements in natural Sorting Order ?

Core Java

a. AbstractSet

b. HashSet

c. LinkedHashSet

d. TreeSet

Ans.d. TreeSet

Search Interview Questions

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