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Interview Questions and Answers for 'Polaris' - 17 question(s) found - Order By Newest

Frequently asked in Infosys and HCL Technologies ( Based on 2 feedback )
 Q1. What are different ways of object creation in Java ?Core Java
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info@buggybread.com
Ans. Using new operator - new xyzClass()

Using factory methods - xyzFactory.getInstance( )

Using newInstance( ) method - (Class.forName(xyzClass))emp.newInstance( )

By cloning an already available object - (xyzClass)obj1.clone( )

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 Q2. Which of the following combination of keywords is illegal in Java ?

a. static and transient
b. transient and final
c. static and synchronized
d. abstract and final
Core Java
Anonymous
Ans. abstract and final

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  Q3. What is a String Pool ?Core Java
Anonymous
Ans. String pool (String intern pool) is a special storage area in Java heap. When a string is created and if the string already exists in the pool, the reference of the existing string will be returned, instead of creating a new object and returning its reference.

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Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives.
  Q4. Difference between Overloading and Overriding ?Core Java
Anonymous
Ans. Overloading - Similar Signature but different definition , like function overloading.

Overriding - Overriding the Definition of base class in the derived class.

  Sample Code for overloading

  Sample Code for overriding

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 Q5. What is Generalization and Specialization in terms of casting ?Core Java
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Ans. Generalization or UpCasting is a phenomenon where a sub class is prompted to a super class, and hence becomes more general. Generalization needs widening or up-casting. Specialization or DownCasting is a phenomenon where a super class is narrowed down to a sub class. Specialization needs narrowing or down-casting.

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   Like      Discuss      Correct / Improve     java   data types   casting   up casting   downcasting   generalization   specialization     Tata Consultancy (TCS)  VirtusaPolaris


Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 2 feedback ). Among first few questions in many interviews.
  Q6. Differences between abstract class and interface ?Core Java
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Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ).

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 Q7. What does String intern() method do?Core Java
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Ans. intern() method keeps the string in an internal cache that is usually not garbage collected.

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   Like      Discuss      Correct / Improve     java   string class   string   intern method   garbage collection   advanced     Polaris  Netflix      expert


Frequently asked in CTS ( Based on 2 feedback )
  Q8. What is the difference between comparable and comparator in java.util pkg?Core Java
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Ans. Comparable interface is used for single sequence sorting i.e.sorting the objects based on single data member where as comparator interface is used to sort the object based on multiple data members.

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 Q9. What is a Class ?Core Java
Admin
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Ans. A class is a blue print or Mold using which individual objects are created. A class can contain fields and methods to describe the behavior of an object.

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   Like      Discuss      Correct / Improve     java   oops   class   basic interview question     polaris financial technology      basic        frequent



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  Q10. Can we have null keys in TreeMap ?Core Java
Admin
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Ans. No, results in exception.

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   Like      Discuss      Correct / Improve     java   collections   treemap     Visa  Prokarma  Sabre  Polaris  Deloitte  Cognizant (CTS)      Basic        frequent


Frequently asked in face to face interviews.
  Q11. Write a program to print fibonacci series.Core Java

Ans. int count = 15;
int[] fibonacci = new int[count];
fibonacci[0] = 0;
fibonacci[1] = 1;
for(int x=2; x < count; x++){
fibonacci[x] = fibonacci[x-1] + fibonacci[x-2];
}

for(int x=0; x< count; x++){
System.out.print(fibonacci[x] + " ");
}

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 Q12. Why can't we declare a class abstract as well as final ?Core Java

Ans. Abstract means that the class is only meant to be subclassed whereas final means that it cannot be subclassed so both concepts - abstract and final are actually mutually exclusive and hence not permitted together.

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   Like      Discuss      Correct / Improve     abstract   final   java keywords     VirtusaPolaris


Frequently asked in high end product companies.
 Q13. How is Hashmap internally implemented in Java ?Core Java2016-12-06 08:49:37

Ans. https://www.quora.com/How-is-Hashmap-in-Java-implemented-internally-What-are-the-pros-and-cons-to-use-it-What-are-the-complexities-it-provides-for-insert-delete-and-lookup/answer/Anshudeep-Bajpai?srid=iwnK

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 Q14. When should we use Abstract classes ?Core Java2016-12-23 20:12:52

Ans. Abstract classes provide a mechanism of interfacing ( using abstract method ) as well as inheritance ( extending abstract class ). So they should be used in place of interfaces in case there is some code ( methods ) or object body ( member elements ) that can be reused with inheritance.

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   Like      Discuss      Correct / Improve     abstract classes     Polaris


 Q15. Will the following code compile ?

final HashMap hm = new HashMap();
hm.put("Ravi", 221);
Core Java2017-07-17 08:08:58

Ans. Yes, it will compile without error. final in this context means that the reference hm cannot be assigned to a new hash map but didn't restrict from changing the state of collection already held by hm.

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   Like      Discuss      Correct / Improve     final  final variable     Polaris


 Q16. Difference between JVM, JRE and JDK ?Core Java2017-10-31 08:36:22

 This question was recently asked at 'Infosys,HCL Technologies,Mphasis,Polaris]'.This question is still unanswered. Can you please provide an answer.


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 Q17. What is abstraction ?2017-10-13 09:23:38

 This question was recently asked at 'Tata Consultancy (TCS),HCL Technologies,Infosys,Deegit,Barclays,General Electric (GE),Capgemini,Accenture,Polaris,IBM,eGov Jamaica,Skillnet Solutions,Mastek,Avvo,Computer Science Corporation (CSC),Revature,Erricson,Allianz,Fidelity Information Services (FIS)'.This question is still unanswered. Can you please provide an answer.


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