Interview Questions and Answers for 'C' | Search Interview Question - javasearch.buggybread.com
Javasearch.buggybread.com

Search Interview Questions


 More than 3000 questions in repository.
 There are more than 900 unanswered questions.
Click here and help us by providing the answer.
 Have a video suggestion.
Click Correct / Improve and please let us know.
Label / Company      Label / Company / Text

   



Interview Questions and Answers - Order By Rating

   next 30
  Q2101. Explain static blocks in Java ?Core Java
Ans. A static initialization block is a normal block of code enclosed in braces, { }, and preceded by the static keyword. Here is an example:

static {
// whatever code is needed for initialization goes here
}

A class can have any number of static initialization blocks, and they can appear anywhere in the class body. The runtime system guarantees that static initialization blocks are called in the order that they appear in the source code.

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

   Like         Discuss         Correct / Improve     java   oops   static   static block     Asked in 16 Companies      basic        frequent

 Q2102. Which access specifier can be used with Class ?Core Java
Ans. For top level class we can only use "public" and "default". We can use private with inner class.

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

   Like         Discuss         Correct / Improve     java   class   access specifier   inner classes      basic        frequent

 Q2103. What is meant by an "asynchronous event." Give some examples ?Operating System
Ans. An asynchronous event is one that occurs at an unpredictable time outside the control of the program that the CPU is running. It is not "synchronized" with the program.

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

   Like         Discuss         Correct / Improve     j2ee   internet   web application   asynchronus   asynchronus communication   architecture     Asked in 1 Companies

 Q2104. Explain use of nested or inner classes ?Core Java
Ans. Sometime we just need classes or class objects just to be used as part of a particular class or objects. Making them non nested won't make any difference as far as functionality is concerner but making them Nested provide a level of convenience and protection fro, being used anywhere else. Moreover it helps reducing the Code.

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

   Like         Discuss         Correct / Improve     java   oops   inner classes   nested class   inner class     Asked in 2 Companies
Try 1 Question(s) Test

 Q2105. Explain Annotations ?
Ans. Annotations, a form of metadata, provide data about a program that is not part of the program itself. Annotations have no direct effect on the operation of the code they annotate. Annotations have a number of uses, among them:
• Information for the compiler — Annotations can be used by the compiler to detect errors or suppress warnings.
• Compile-time and deployment-time processing — Software tools can process annotation information to generate code, XML files, and so forth.
• Runtime processing — Some annotations are available to be examined at runtime.

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

   Like         Discuss         Correct / Improve     java   annotations      basic        frequent

 Q2106. How to display and set the Class path in Unix ?
Ans. To display the current CLASSPATH variable, use these commands in UNIX (Bourne shell):

% echo $CLASSPATH

To delete the current contents of the CLASSPATH variable,

In UNIX: % unset CLASSPATH; export CLASSPATH

To set the CLASSPATH variable,

In UNIX: % CLASSPATH=/home/george/java/classes; export CLASSPATH

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

   Like         Discuss         Correct / Improve     unix   unix commands   classpath

 Q2107. Difference between Abstract and Concrete Class ?Core Java
Ans. Abstract classes are only meant to be sub classed and not meant to be instantiated whereas concrete classes are meant to be instantiated.

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

   Like         Discuss         Correct / Improve     java   oops   abstract classes   Abstract vs Concrete Class     Asked in 1 Companies      basic        frequent

Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies.
  Q2108. Difference between Overloading and Overriding ?Core Java
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

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

   Like         Discuss         Correct / Improve     java   oops   overloading   overriding   oops concepts   basic interview question   overloading vs overriding     Asked in 86 Companies      basic        frequent
Try 1 Question(s) Test

  Q2109. Difference between Vector and ArrayList ?Core Java
Ans. Vectors are synchronized whereas Array lists are not.

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

   Like         Discuss         Correct / Improve     java   basic interview question   vector   arraylist   collections   synchronization   vector vs arraylist     Asked in 35 Companies      basic        frequent

 Q2110. Different ways of implementing Threads in Java ?Core Java
Ans. Threads in Java can be implement either by Extending Thread class or implementing runnable interface.

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

   Like         Discuss         Correct / Improve     java   threads   multi threading     Asked in 1 Companies      basic        frequent

Frequently asked question for intermediate developers. Frequently asked in HCL Technologies and EPAM.
  Q2111. 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

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

   Like         Discuss         Correct / Improve     java   oops   synchronization   volatile   java keywords     Asked in 42 Companies      intermediate        frequent
Try 1 Question(s) Test

Frequently asked in Cognizant (CTS)
  Q2112. What is Serialization ? Why do we need it ?Core Java
Ans. Storing the state of an object in a file or other medium is called serialization.

Classes can communicate only if they are built together ( as they need Byte code for communication ). What if we need to enable communication between different applications ( i.e they have been built independently or even they reside at different locations ), We need a mechanism that will transfer the Bean state to a Medium than can be transferred to the receiving application.

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

   Like         Discuss         Correct / Improve     java   oops   serialization     Asked in 18 Companies      basic        frequent
Try 1 Question(s) Test

  Q2113. What is the use of Transient Keyword ?Core Java
Ans. It in Java is used to indicate that a field should not be serialized.

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

   Like         Discuss         Correct / Improve     java   oops   serialization   transient   java keywords     Asked in 39 Companies      intermediate        frequent
Try 2 Question(s) Test

 Q2114. What is a Final Method ?Core Java
Ans. A Method that cannot be overriden in the sub class.

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

   Like         Discuss         Correct / Improve     java   oops   java keywords   final   final method   overriding   basic interview question      basic        frequent
Try 1 Question(s) Test

Very Frequently asked.Favorite question in Walk in drive for many Indian service companies.
 Q2115. What is a Final Class ?
Ans. A Class that cannot be sub classed.

  Sample Code for final class

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

   Like         Discuss         Correct / Improve     java   oops   final   final class   java keyword   basic interview question     Asked in 3 Companies      basic        frequent

Very frequently asked. Usually asked with questions related to String. Frequently asked at CTS / Cognizant
  Q2116. What is an Immutable Object ?Core Java
Ans. Object that can't be changed after instantiation.

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

   Like         Discuss         Correct / Improve     java   oops   immutable  immutability     Asked in 27 Companies      basic        frequent
Try 2 Question(s) Test

Very Frequently asked. Usually asked along with String Class related questions.
  Q2117. What is an immutable class ?Core Java
Ans. Class using which only immutable (objects that cannot be changed after initialization) objects can be created.

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

   Like         Discuss         Correct / Improve     java   oops   immutable  immutability   immutable  immutability class   string class   basic interview question     Asked in 18 Companies      Basic        frequent
Try 2 Question(s) Test

 Q2118. How to implement an immutable class ?Core Java
Ans. We can make a class immutable by

1. Making all methods and variables as private.

2. Setting variables within constructor.

Public Class ImmutableClass{

private int member;
ImmutableClass(int var){
member=var;
}
}

and then we can initialize the object of the class as

ImmutableClass immutableObject = new ImmutableClass(5);

Now all members being private , you cant change the state of the object.

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

   Like         Discuss         Correct / Improve     java   oops   immutable  immutability   immutable  immutability class   technical lead     Asked in 5 Companies      intermediate        frequent
Try 2 Question(s) Test

 Q2119. Does Declaring an object "final" makes it immutable ?Core Java
Ans. Only declaring variables as final makes them immutable. Making objects final means that the object handler cannot be used to target some other object but the object is still mutable.

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

   Like         Discuss         Correct / Improve     java   oops   final   immutable  immutability   immutable  immutability object

 Q2120. Difference between object instantiation and construction ?Core Java
Ans. Though It's often confused with each other, Object Creation ( Instantiation ) and Initialization ( Construction ) are different things in Java. Construction follows object creation.

Object Creation is the process to create the object in memory and returning its handler. Java provides New keyword for object creation.

Initialization is the process of setting the initial / default values to the members. Constructor is used for this purpose. If we don't provide any constructor, Java provides one default implementation to set the default values according to the member data types.

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

   Like         Discuss         Correct / Improve     java   oops   constructor   object instantiation

 Q2121. Can we override static methods ? Why ?Core Java
Ans. No.

Static methods belong to the class and not the objects. They belong to the class and hence doesn't fit properly for the polymorphic behavior.

A static method is not associated with any instance of a class so the concept of overriding for runtime polymorphism using static methods is not applicable.

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

   Like         Discuss         Correct / Improve     java   oops   static   static methods   java keywords   yes-no      intermediate        frequent

 Q2122. Can we access instance variables within static methods ?Core Java
Ans. Yes.we cannot access them directly but we can access them using object reference.Static methods belong to a class and not objects whereas non static members are tied to an instance. Accessing instance variables without the instance handler would mean an ambiguity regarding which instance the method is referring to and hence its prohibited.

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

   Like         Discuss         Correct / Improve     java   oops   static   static methods   java keywords     Asked in 1 Companies

 Q2123. Can we reduce the visibility of the inherited or overridden method ?Core Java
Ans. No.

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

   Like         Discuss         Correct / Improve     java   oops   access specifier   overriding   overridding   inheritence   yes-no

 Q2124. Give an Example of checked and unchecked exception ?Core Java
Ans. ClassNotFoundException is checked exception whereas NoClassDefFoundError is a unchecked exception.

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

   Like         Discuss         Correct / Improve     java   exceptions   checked exceptions   unchecked exceptions   exception handling     Asked in 2 Companies

 Q2125. Name few Java Exceptions ?Core Java
Ans. IndexOutofBoundException ,
NoClassDefFoundException ,
OutOfMemoryException ,
IllegalArgumentException,
NullPointerException,
IllegalStateException

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

   Like         Discuss         Correct / Improve     java   oops   exceptions   basic interview question      basic        frequent

Frequently asked to fresh graduates and less experienced.
 Q2126. Which of the following is tightly bound ? Inheritance or Composition ?Core Java
Ans. Inheritance.

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

   Like         Discuss         Correct / Improve     inheritance  object oriented programming (oops)  oops concepts   java   oops   composition  object oriented programming (oops)  oops concepts     Asked in 1 Companies      basic        frequent

 Q2127. How can we make sure that a code segment gets executed even in case of uncatched exceptions ?
Ans. By putting it within finally.

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

   Like         Discuss         Correct / Improve     java   oops   exceptions   finally   uncatched exceptions      basic        frequent

 Q2128. Explain the use of "Native" keyword ?Core Java
Ans. Used in method declarations to specify that the method is not implemented in the same Java source file, but rather in another language

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

   Like         Discuss         Correct / Improve     java   native   java keywords     Asked in 1 Companies

 Q2129. What is "super" used for ?
Ans. Used to access members of the base class.

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

   Like         Discuss         Correct / Improve     java   oops   java keywords   super   basic interview question     Asked in 2 Companies      basic        frequent

 Q2130. What is "this" keyword used for ?
Ans. Used to represent an instance of the class in which it appears.

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

   Like         Discuss         Correct / Improve     java   oops   java keywords   this   basic interview question      basic        frequent

previous 30   next 30

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

Any input from you will be highly appreciated and It will unlock the application for 10 more requests.

Company Name:
Questions Asked: