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Interview Questions and Answers for 'Infoview technologies' - 16 question(s) found - Order By Newest

Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback ) and Epam Systems
  Q1. Difference between == and .equals() ?Core Java
Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory.

x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object.

Sample code:

String x = new String("str");
String y = new String("str");

System.out.println(x == y); // prints false
System.out.println(x.equals(y)); // prints true

  Sample Code for equals

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   Like         Discuss         Correct / Improve     java   string comparison   string   object class   ==    equals   object equality  operator   == vs equals   equals vs ==     Asked in 294 Companies      basic        frequent
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Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.
  Q2. Differences between abstract class and interface ?Core Java
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 ).

A class can extend single abstract class whereas it can implement multiple interfaces.

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   Like         Discuss         Correct / Improve     java   classes   abstract class   interfaces   abstract class vs interface   abstract classes vs interfaces     Asked in 82 Companies      basic        frequent

 Q3. 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
Ans. abstract and final

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   Like         Discuss         Correct / Improve     java   java keywords     Asked in 2 Companies      basic

Frequently asked question for intermediate developers. Frequently asked in HCL Technologies and EPAM.
  Q4. What is Volatile keyword used for ?Core Java
Ans. Volatile is a declaration that a variable can be accessed by multiple threads and hence shouldnt be cached.

  Sample Code for volatile

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   Like         Discuss         Correct / Improve     java   oops   synchronization   volatile   java keywords     Asked in 42 Companies      intermediate        frequent
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 Q5. What was the driving force to introduce default methods in Interfaces wef from Java 8 ?Core Java
Ans. Earlier any class implementing an interface was supposed to implement all methods declared in an interface. There was no place for optionally implementing all or subset of methods.Though we have abstract classes wherein we could have provided such a mechanism by declaring some methods as abstract while providing definition for some. But as Abstract classes have a body and are comparatively heavier than interfaces and interfaces associate closely to the concept of providing interfacing than abstract classes, Java might have though of providing optional implementation for default methods. This way same interface can be reused in variety of ways rather than making copies of an interface to suit different needs.

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   Like         Discuss         Correct / Improve     java 8   java8  interface default methods  default methods     Asked in 6 Companies

 Q6. Does java supports operator overloading ?Core Java
Ans. No

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   Like         Discuss         Correct / Improve     operator overloading     Asked in 1 Companies      basic

 Q7. Can static method access instance variables ?Core Java
Ans. Though Static methods cannot access the instance variables directly, They can access them using instance handler.

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   Like         Discuss         Correct / Improve     static   static method   java   oop   variables     Asked in 1 Companies      basic        frequent

Recently asked in Infoview Technologies.
 Q8. What is a Default Constructor ?Core Java
Ans. The no argument constructor provided by Java Compiler if no constructor is specified.

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   Like         Discuss         Correct / Improve     java   oops   constructor   default constructor     Asked in 1 Companies      Basic        frequent
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  Q9. Explain the challenging problems you faced recently and how you overcame it ?General
Ans. [Open Ended Answer]

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   Like         Discuss         Correct / Improve     elsevier   open ended questions   overstock.com   cerner     Asked in 15 Companies        frequent

Must know at all levels. Among Top 10 frequently asked questions in Java. Very frequently asked to fresh graduates or less experienced professionals.
  Q10. What is Inheritance ?Core Java
Ans. Its a facility for code reuse and independent extension wherein a derived class inherits the properties of parent class.

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   Like         Discuss         Correct / Improve     inheritance  object oriented programming (oops)  oops concepts  oops concepts  java concepts  code reuse  code re-use   classes  derived classes     Asked in 14 Companies      basic        frequent

Frequently asked to Fresh graduates.
 Q11. Write a program to implement Binary search ?Core Java
Ans. http://algs4.cs.princeton.edu/11model/BinarySearch.java.html

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   Like         Discuss         Correct / Improve     binary search  search     Asked in 5 Companies      basic        frequent
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All these acronyms JDK,JRE,JVM etc are very frequently asked.
 Q12. Difference between JDK and JRE ?Core Java
Ans. JRE or Java Runtime Environment is the Java Virtual Machine on which class files are executed. It includes borwser plugins that facilitates execution of class files in browsers.

JDK or Java Development Kit includes JRE , compiler and development tools.

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   Like         Discuss         Correct / Improve     JDK  JRE  JDK vs JRE  Difference between     Asked in 4 Companies      basic        frequent

 Q13. How do you manage source code in repository if you have multiple releases lined up and different teams are working on it? Tools
Ans. We creates separate branches for each project if development work is going on parallel and they are to be released at different times. Once the first release is done, we merge the branch changes into trunk. If they all have to go at one time, we usually would merge everything in the trunk itself.

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   Like         Discuss         Correct / Improve     scm  source code management  svn  version control  code repository  svn branch     Asked in 1 Companies

 Q14. What are Collection Classes ?Core Java
Ans. Collections in java is a framework of classes that provides an abstracted data structure to store and manipulate the group of objects. Each class is unique in the way it stores , search , sort and modify the elements.

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   Like         Discuss         Correct / Improve     collections  collection classes     Asked in 1 Companies      Basic        frequent

 Q15. Write a Program to print the positive and negative numbers separetlyCore Java
Ans. int[] arr = {1,-1,2,-3,3,-4,4,5,6,-5,-6,-7,-8,8,9,-9};
List positiveNumbers = new ArrayList<>();
List negativeNumbers = new ArrayList<>();
for(int i = 0; i < arr.length(); i ){
if(I < 0){
negativeNumbers.add(i);
} else {
positiveNumbers.add(i);
}
}

System.out.println("Positive Numbers:" + positiveNumbers);
System.out.println("Negative Numbers:" + negativeNumbers);

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   Like         Discuss         Correct / Improve     code  program  coding     Asked in 1 Companies

 Q16. Which class is the root class of all Exceptions in Java ?
Ans. Throwable

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   Like         Discuss         Correct / Improve          Asked in 1 Companies      basic        frequent

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