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Interview Questions and Answers - Order By Rating

   
  Q71. What is the use of HashCode in objects ?Core Java
Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc.

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   Like         Discuss         Correct / Improve     java   string   hashcode   hash code   string comparison  hashtable     Asked in 17 Companies      basic        frequent

Frequently asked to fresh graduates and less experienced.
  Q72. Difference between Composition and Inheritance ?Core Java
Ans. Inheritance means a object inheriting reusable properties of the base class. Compositions means that an abject holds other objects.

In Inheritance there is only one object in memory ( derived object ) whereas in Composition , parent object holds references of all composed objects.

From Design perspective - Inheritance is "is a" relationship among objects whereas Composition is "has a" relationship among objects.

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   Like         Discuss         Correct / Improve     java   oops   oops concepts   inheritance  object oriented programming (oops)  oops concepts   composition  object oriented programming (oops)  oops concepts   difference between   basic interview question     Asked in 12 Companies      basic        frequent
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  Q73. What do you mean by "Java is a statically typed language" ?Core Java
Ans. It means that the type of variables are checked at compile time in Java.The main advantage here is that all kinds of checking can be done by the compiler and hence will reduce bugs.

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   Like         Discuss         Correct / Improve     java   statically typed language   variable declaration     Asked in 7 Companies      basic        frequent

 Q74. What are different types of second level cache ?Hibernate
Ans. 1. EHCache ( Easy Hibernate )
2. OSCache ( Open Symphony )
3. Swarm Cache ( JBoss )
4. Tree Cache ( JBoss )

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   Like         Discuss         Correct / Improve     hibernate   orm   hibernate cache   technical lead     Asked in 7 Companies

Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q75. 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

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   Like         Discuss         Correct / Improve     collections   java   data structures   arraylist   linkedlist   arraylist vs linkedlist     Asked in 61 Companies      Basic        frequent
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Frequently asked question in companies using Hibernate.
  Q76. 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

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   Like         Discuss         Correct / Improve     hibernate   lazy loading hibernate   lazy initialization hibernate   architecture     Asked in 77 Companies      Basic        frequent
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Frequently asked at Manhattan Associates ( Based on 2 feedback )
  Q77. 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

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   Like         Discuss         Correct / Improve     java   java8   lambda expression   architecture     Asked in 58 Companies      expert        frequent
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 Q78. How is Abstraction implemented in Java ?Core Java
Ans. Abstraction is provided in Java by following ways -

Coding to the ( Interfaces / Abstract Classes ) or contracts

By Encapsulating details within classes and exposing the minimal Door ( few public methods )

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   Like         Discuss         Correct / Improve     java   oops concepts   abstraction   interfaces   abstract class   encapsulation  object oriented programming (oops)  oops concepts     Asked in 3 Companies      basic        frequent

 Q79. What are some different logging levels for log4j ?Log4j
Ans. DEBUG
ERROR
ALL
WARN
INFO
FATAL
OFF
TRACE
TRACE_INT
WARN

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   Like         Discuss         Correct / Improve     java   log4j   log4j level   logging   error logging     Asked in 10 Companies

 Q80. What is Criteria in Hibernate ?Hibernate
Ans. Criteria is a simplified API for retrieving entities by composing Criterion objects.

For example - session.createCriteria(Employee.class).add( Restrictions.like("name", "A%") ).list();

will return all employee objects having name starting with A.

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   Like         Discuss         Correct / Improve     hibernate   hibernate criteria     Asked in 7 Companies      Basic        Frequent
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  Q81. Which Software Development methodology is being used in your current Job ?General
Ans. We are using Agile methodology. I attend daily stand up where the development leads takes the status of assigned stories, achievements, any bottlenecks or challenges. We follow iteration of 2 weeks.

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   Like         Discuss         Correct / Improve     sdlc   agile methodology   software system analyst   software developer interview   development lead   project lead interview     Asked in 14 Companies        frequent

  Q82. Difference between jar , war and ear ?Java EE
Ans. Jar is Java Archieve i.e compressed Class or Class / Java files.

War comprises of compressed Servlet class files,JSP FIles,supporting files, GIF and HTML files.

Ear comprise of compressed Java and web module files ( was files ).

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   Like         Discuss         Correct / Improve     java   j2ee   jar   web development   war   ear   build management   release management     Asked in 12 Companies      basic        frequent

Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.
  Q83. 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

 Q84. Which access specifiers can be used with top level class ? a. public or default b. public or private c. public or protected d. protected or defaultCore Java
Ans. public or default

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   Like         Discuss         Correct / Improve     access specifier   oops   java   class     Asked in 2 Companies

 Q85. Which of the collections allows null as the key ?

a. HashTable
b. HashMap
c. TreeMap
d. LinkedHashMap		Core Java
Ans. HashMap

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   Like         Discuss         Correct / Improve     java   collections   map  hashtable     Asked in 2 Companies      basic        frequent

Almost sure to be asked in every company using any Dependency Injection framework ( Spring, Guice etc )
  Q86. What is Dependency Injection or IOC ( Inversion of Control ) ?Design
Ans. It is a Design Pattern that facilitates loose coupling by sending the dependency information ( object references of dependent object ) while building the state of the object. Objects are designed in a manner where they receive instances of the objects from other pieces of code, instead of constructing them internally and hence provide better flexibility.

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   Like         Discuss         Correct / Improve     design patterns   ioc ( Inversion of Control )  dependency injection     Asked in 83 Companies      intermediate        frequent

  Q87. How are values passed in Java ? By value or reference ?Core Java
Ans. Java only provides pass by value.

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   Like         Discuss         Correct / Improve     ebay   pass by value   pass by reference   method call   methods   functions   function call     Asked in 10 Companies      basic        frequent

Must know at all levels. Among Top 10 frequently asked questions in Java. Very frequently asked to fresh graduates or less experienced professionals.
  Q88. 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

Very frequently asked to fresh graduates. Frequently asked in NSEiT and Accenture India
 Q89. Write a program to Generate prime numbers till a given numberCore Java
Ans. public class Main {
public static void main(String args[]) {
int number = 2;
int count = 0;
long sum = 0;
int givenNumber = 1000;
while (count < givenNumber) {
if (isPrimeNumber(number)) {
sum = number;
count;
}
number;
}
System.out.println(sum);
}
private static boolean isPrimeNumber(int number) {
for (int i = 2; i <= number / 2; i) {
if (number % i == 0) {
return false;
}
}
return true;
}
}

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