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Interview Questions and Answers - Order By Newest

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 Q511. How can we catch an exception thrown by another thread ?Core Java
Ans. http://stackoverflow.com/a/6548203/2789764

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   Like         Discuss         Correct / Improve     exception handling  exception      expert        rare

 Q512. How can you check if a String is a 10 digit number by using regular expression ?Core Java
Ans. We can use \d{10} as the expression to check that

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   Like         Discuss         Correct / Improve     regular expression

 Q513. What is Java NumberFormatException ?Core Java
Ans. NumberFormatException is the exception that Java throws when we try to convert one data type to the Number data type but the value is not parsable to be a Number.

For example , the following code will result in the NumberFormatException

String string = "Buggy";
int strtoInt = Integer.parseInt(string);

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   Like         Discuss         Correct / Improve     exceptions  NumberFormatException

 Q514. Which is better in terms of performance - Iterator or Spliterator ?Core Java
Ans. Spliterator has better performance potential than iterators but only if the potential is used. Spliterator can iterate streams in parallel as well as in sequence whereas iterator can only iterate in sequence.

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   Like         Discuss         Correct / Improve     iterator  collections  streams  parallel streams  Spliterator

 Q515. How to specify the or/and combination restrictions within Criteria in Hibernate ? Hibernate
Ans. session.createCriteria(Employee.class).add( Restrictions.or(Restrictions.like("name", "A%"),Restrictions.like("name", "B%"))).list();

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   Like         Discuss         Correct / Improve     hibernate  Criteria  Restrictions

 Q516. How Java is different than C/C++ in terms of memory allocation and de-allocation ?Core Java
Ans. Java provides a faster allocation mechanism but at the cost of expensive deallocation. Deallocation in java is done by mechanism called garbage collection that runs periodically to free up unclaimed memory space , which actually slows down the application. Hence Java is usually faster if memory is not of concern and sufficiently large memory can be allocated to an application.

C/C++ on other hand have equal cost of allocation and de-allocation.


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   Like         Discuss         Correct / Improve     c++  java vs c++     Asked in 2 Companies

 Q517. Write an Algorithm for Graph Traversal ? The Graph has a loop.Algorithm
Ans. Please not that all such questions can be easily answered through recursion.

Simple recursive implementation could be

traverse(root);

void traverse(Element element){
if(element.hasNext()){
traverse(element.next());
} else {
System.out.println(element);
}
}

but this algo / code lead to endless loop if there is a loop in graph traversal.

So you can keep a collection to keep track of which elements have laready been traversed


static List<Elements> listOfAlreadyTraversedElements = new ArrayList<Elements>();

main(){
traverse(root);
}

void traverse(Element element){
if(element.hasNext()){
traverse(element.next());
} else {
listOfAlreadyTraversedElements.add(element);
System.out.println(element);
}
}

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   Like         Discuss         Correct / Improve     graph traversal algorithm  graph traversal algorithm using recursion     Asked in 1 Companies      intermediate

 Q518. Difference between relational databases and NoSQL databases ?Database
Ans. https://www.mongodb.com/scale/nosql-vs-relational-databases

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   Like         Discuss         Correct / Improve     database management  nosql database  relational database     Asked in 1 Companies        frequent

 Q519. Difference between Error and Exception ?Core Java
Ans. An Error indicates serious problems that a reasonable application should not try to catch whereas

An Exception indicates conditions that a reasonable application might want to catch.

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   Like         Discuss         Correct / Improve     error  exception handling  exceptions     Asked in 2 Companies      basic        frequent

Frequently asked in Accenture.
  Q520. What is your biggest achievement at work ?General
Ans. [Open Ended Answer]

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   Like         Discuss         Correct / Improve     general question  non technical question     Asked in 20 Companies        frequent

 Q521. 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

 Q522. Explain some of the http status codes you know ?Java EE
Ans. 500 is Internal Server Error

404 is resource not found

400 is Bad Request

403 is Forbidden

401 is Unauthorized

200 is OK

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   Like         Discuss         Correct / Improve     http  http status codes     Asked in 2 Companies        frequent

  Q523. What is Maven ?Maven
Ans. Maven is a build automation tool used primarily for Java projects.

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   Like         Discuss         Correct / Improve     maven  build     Asked in 6 Companies      basic        frequent

 Q524. What is serialVersionUID ?Core Java
Ans. Everytime an object is serialized the java serialization mechanism automatically computes a hash value by passing the meta information for the class. This id is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization

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   Like         Discuss         Correct / Improve     serialVersionUID  serialization     Asked in 3 Companies      expert        rare

 Q525. With a Table employee having columns Id,Name,ManagerEmployeeId, Write a SQL to find the Manager with maximum number of employees ?Database
Ans. Select Name from EMPLOYEE where ID in (Select ManagerEmployeeId from EMPLOYEE
Group By ManagerEmployeeId
order by count(Id)
LIMIT 1)

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   Like         Discuss         Correct / Improve     database  sql     Asked in 1 Companies

 Q526. What is the difference between following code segments

1.

try {
for(int i=0;i<100;i++){
calculate(i);
}
} catch (Exception ex) {
System.out.println("Error while processing")
}

and

2.

for(int i=0;i<100;i++){
try {
calculate(i);
} catch (Exception ex) {
System.out.println("Error while processing")
}
}
Core Java
Ans. In first case the whole loop will terminate as soon as any exception happens in the method calculate ( assuming calculate method is not handling its exception and those are thrown back at the calling method )

In Second case exception will be caught for individual iteration and hence it wont break the loop and will continue for the next iteration.

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   Like         Discuss         Correct / Improve     exception handling  try catch     Asked in 1 Companies

 Q527. What is the difference between ServletConfig and ServletContext ?Java EE
Ans. http://www.java4s.com/java-servlet-tutorials/difference-between-servletconfig-and-servletcontext-in-java/

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   Like         Discuss         Correct / Improve     ServletConfig  ServletContext     Asked in 1 Companies

  Q528. What is an exception and exception handling in Java ?Core Java
Ans. An Exception in java is the occurrence during computation that is anomalous and is not expected.

Exception handling is the mechanism which is used to handle such situations.


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   Like         Discuss         Correct / Improve     exception handling     Asked in 18 Companies      basic        frequent

 Q529. What is Spring Security ?Spring
Ans. Spring Security is a powerful and highly customizable authentication and access control framework. It is the de facto standard for securing Spring-based applications.

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   Like         Discuss         Correct / Improve          Asked in 3 Companies

 Q530. Is there any relationship between Web.xml and Spring.xml ?Spring
Ans. No, there is no relationship between web.xml and spring.xml but you have to configure spring.xml in web.xml in order initialize beans when application starts up

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   Like         Discuss         Correct / Improve     spring  web.xml  spring.xml  deployment descriptor     Asked in 1 Companies

 Q531. Why do you wan to stay in IT ?General
Ans. Coding , Science and Mathematics has always fascinated me. I have curious mindset that continuously look for solutions.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies

 Q532. How to make sure that no request are lost in client server application ?Solution
Ans. By keeping some sort of storage at the client side for each request and then matching it up against the response received to make sure that the request was well received.

A queue can be used for this purpose.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies

 Q533. Which environment variables do we need to set in order to run Java programs?Core Java
Ans. PATH, CLASSPATH and JAVA_HOME

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   Like         Discuss         Correct / Improve     environment variables  path  classpath  java_home     Asked in 3 Companies      basic        frequent

 Q534. What are the different ways to handle an exception ?Core Java
Ans. 1. Wrap the desired code in try block followed by a catch / finally to catch the exception

2. Declare the throws clause with exceptions that the code is expected to throw as an indication to the calling method to take care of it.

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   Like         Discuss         Correct / Improve     exception handling     Asked in 4 Companies
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 Q535. What kind of thread is garbage collection thread ?Core Java
Ans. Daemon thread

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   Like         Discuss         Correct / Improve     garbage collection      intermediate
Try 2 Question(s) Test

 Q536. What is the difference between the Reader/Writer java.io hierarchy and the Stream class hierarchy?Core Java
Ans. The Reader/Writer hierarchy is character oriented, whereas the Stream class hierarchy is byte oriented.

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   Like         Discuss         Correct / Improve     java io  streams      intermediate

 Q537. What is an IO Filter ?Core Java
Ans. It's an object that reads from one stream and writes to another.

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   Like         Discuss         Correct / Improve     java io  io filter      intermediate

 Q538. Which Web and Application server is being used by your application ?Server
Ans. We are using Apache 2.3 and Tomcat 5.6

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   Like         Discuss         Correct / Improve     web server  application server  server      Basic        frequent

 Q539. What are the steps you follow if you receive an application outage ticket ?Support
Ans. a. Inform the stake holders that the issue is being worked upon.
b. Login to server to see if its responding.
c. Access Application and Web Server logs to see if the application is receiving requests.
d. If not, Involve the appropriate Network Team.
e. Inform the stakeholders regarding the progress.
f. Bounce the web / application server instance , if required.
g. Close the ticket with the steps taken to resolve the problem.
h. Complete the RCA ( Root Cause Analysis ) and submit the report to stake holders.

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   Like         Discuss         Correct / Improve     production support

 Q540. How do you monitor the server resources if inadvertently high traffic is reported ?Support
Ans. We use SAR command for that purpose. We also have GUI system monitoring tool to keep real time check of requests, load and memory usage.

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   Like         Discuss         Correct / Improve     production support  unix  SAR

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