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

Interview Questions and Answers - Order By Newest

Q661. Can we synchronize the run() method in Java?

^{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 synchronization multithreading run method}

Q662. How would you design a stack which, in addition to push and pop, also has a function min which returns the minimum element? Push, pop and min should all operate in O(1) time

Algorithm

^{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 Data Stricture Big O Notation time complexity}

Q663. What are the uses of Abstraction ?

Core Java

Ans. Loose Coupling
Facilitates designing complex applications by making them modular.

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

_{Like Discuss Correct / Improve oops concepts abstraction Asked in 1 Companies}

Q664. Lets say we have a set "set1" with objects of Class A, Class has a non static string called element1, Write a code ( using lambda expression ) to see if there is any object in the set with element1 = "Hello".

Core Java

Ans. set1.stream().filter(p->p.element1.equals("Hello")).findAny().isPreent();

or

set1.stream().map(A::getElement1).anyMatch("Hello"::equals)

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

_{Like Discuss Correct / Improve lambda expressions java 8 java8 java 8 filter findAny()}

Q665. Which of the OOP's features facilitate dependency injection ?

Design

Ans. Inheritance , Runtime Polymorphism and Composition.

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

_{Like Discuss Correct / Improve dependency injection inversion of control ioc oops oops features}

Q666. Is dependency injection possible if we don't have inheritance / Composition ?

Design

Ans. Without composition - No, as it's the core of dependency injection.

With Inheritance - Yes, through interface implementation.

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

_{Like Discuss Correct / Improve dependency injection inversion of control ioc}

Q667. 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}

Q668. Which of the two - iteration or recursion - is slower ?

Core Java

Ans. Any function call is slower than the code in the same method as Java has to maintain stack of meta and function call information. So recursion is slower.

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

_{Like Discuss Correct / Improve iteration recursion iteration vs recursion}

Q669. Explain Hibernate Validation ?

Hibernate

^{This question was recently asked at 'Sofi'.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 hibernate hibernate validation Asked in 1 Companies}

Q670. Which validation frameworks have you worked on ?

Frameworks

^{This question was recently asked at 'Sofi'.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 validation frameworks Asked in 1 Companies}

Q671. How different is the Search algorithm when we query Cassandra Tables and When we query Oracle Tables ?

Cassandra

Ans. Relational Database uses linear search if we don't query using indices. Performance for linear search is O(n). If indices have been used , relational database uses binary search. Performance for binary search is O(Log n).

Casandra uses hash search. Performance for Hash Search is O(1).

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

_{Like Discuss Correct / Improve cassandra vs oracle nosql vs relational search algorithm}

Q672. Difference between Normalization and Denormalization ?

Database

Ans. Normalization is the process of splitting one Table into multiple so as to avoid Data duplication whereas Denormalization is the process of reducing Tables that creates data duplication but would remove joins in the queries.

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

_{Like Discuss Correct / Improve normalization denormalization normaization vs denormalization Asked in 1 Companies}

Q673. Which of the two Normalization / Denormalization facilitate better performance ? Which of the two facilitate better space management ?

Database

Ans. DeNormalization facilitate better performance. Normalization remove data duplication and hence facilitate better database space management.

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

_{Like Discuss Correct / Improve normalization denormalization normalization vs denormalization}

Q674. Which of the following databases - Cassandra / Oracle - provides more flexibility about querying the database ?

Database

Ans. Oracle as it is not modeled for a particular query or set of queries.

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

_{Like Discuss Correct / Improve Cassandra Nosql database nosql vs relational database}

Q675. What could be the driving force to have dependencies injected through class than through config file while using IOC or Dependency Injection ?

Design

Ans. Unit Testing

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

_{Like Discuss Correct / Improve dependency injection inversion of control}

Q676. Write a Program to print fibonacci series using recursion.

Core Java

Ans. public class FibonacciUsingRecursion {
   public static void main(String[] args) throws IOException{
      getNextFibanocci(1,1);
   }

   static int getNextFibanocci(int a,int b){
      if(a+b >= 100){
         return 0;
      } else {
         System.out.println(a+b);
         getNextFibanocci(b,a+b);
      }

      return 0;
   }
}

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

_{Like Discuss Correct / Improve fibonacci recursion}

Q677. Can we use primitive types with Collection classes ?

Core Java

Ans. No, As collection classes involve use of Generics, they cannot accept primitive types.

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

_{Like Discuss Correct / Improve collection classes collections}

Q678. Which objects are eligible for garbage collection ?

Core Java

Ans. Objects that have lost their reference i.e. they cannot be accessed/used by the program anymore.

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

_{Like Discuss Correct / Improve garbage collection Asked in 1 Companies basic}

Q679. Which Data structure can be used for creating Queue ?

Data Structure

^{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 queue collections data structure}

Q680. What is a BlockingQueue ?

Core Java

^{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 queue blockingqueue collections}

Q681. Which immutable classes have you worked with ? Can you name some immutable Collections ? How to make an immutable collection ?

Core Java

Ans. string and wrapper class objects

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

_{Like Discuss Correct / Improve immutability immutable immutability classes immutable immutability collections Asked in 3 Companies}

Q682. Which of the two - Arrays or LinkedList - is a better data structure for implementing Queue ? and Why ?

Data Structure

^{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 Arraylist linkedlist queue collections}

Q683. How is LinkedList collection class internally implemented ? Is it a Linked List or Doubly Linked List ?

Core Java

^{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 linkedlist internal implementation of linkedlist Asked in 1 Companies}

Q684. Suppose we have a string "Java is object oriented language" and we have to reverse every alternate word in string. How would we do that using Java program.

Core Java

^{This question was recently asked at 'datalake solutions'.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 string manipulation code coding Asked in 1 Companies}

Q685. Can you write the code for implementing the one to many (student -> courses) relationship in hibernate?

Hibernate

Ans. @OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name = "student_id")
private Set countries;

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

_{Like Discuss Correct / Improve Asked in 1 Companies}

Q686. Can you explain software design principles cohesion and coupling with an example?

Design

^{This question was recently asked at 'Fidelity Information Services (FIS)'.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 cohesion coupling Asked in 1 Companies frequent}

Q687. What is read and write optimization in relation to databases ? Which database facilitates read optimization and which facilitates write optimization ?

Database

^{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 read optimization write optimization}

Q688. Does relational database facilitate read or write optimization while storing information ?

database

Ans. Usually Relational Databases are optimized for writing. Some exception being usage of indices where indices needs to be updated after insertion and eventually helps with Log(n) reading time.

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

_{Like Discuss Correct / Improve read optimization rdbms relational database}

Q689. How does relational database facilitates read optimization ?

Database

^{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 database rdbms read optimization}

Q690. how does abstraction help your application ?

Core Java

^{This question was recently asked at 'Intel'.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 abstraction oops concepts Asked in 1 Companies basic}

Search Interview Questions

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