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Interview Questions and Answers for 'TD' - 20 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 )
  Q1. Difference between == and .equals() ?Core Java
Anonymous
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     Asked in 289 Companies      basic        frequent

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Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies.
  Q2. 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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   Like         Discuss         Correct / Improve     java   oops   overloading   overriding   oops concepts   basic interview question     Asked in 82 Companies      basic        frequent

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  Q3. Difference between SAX and DOM Parser ?Xml
Admin
info@buggybread.com
Ans. A DOM (Document Object Model) parser creates a tree structure in memory from an input document whereas A SAX (Simple API for XML) parser does not create any internal structure.

A SAX parser serves the client application always only with pieces of the document at any given time whereas A DOM parser always serves the client application with the entire document no matter how much is actually needed by the client.

A SAX parser, however, is much more space efficient in case of a big input document whereas DOM parser is rich in functionality.

Use a DOM Parser if you need to refer to different document areas before giving back the information. Use SAX is you just need unrelated nuclear information from different areas.

Xerces, Crimson are SAX Parsers whereas XercesDOM, SunDOM, OracleDOM are DOM parsers.

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   Like         Discuss         Correct / Improve     java   xml   parsers   sax   dom parser   difference   architecture   technical lead   technical architect  markup language      Asked in 14 Companies        frequent

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 Q4. Can you write a "Hello World" program without using any ";" within it?Core Java2016-12-13 08:26:23

Ans. Yes, That is possible

class A {
public static void main(String args[]){
if(System.out.printf("Hello World")==null){}
}
}

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   Like         Discuss         Correct / Improve     Hello World  Hello world without ;     Asked in 2 Companies        rare


Frequently asked question for intermediate developers.
  Q5. What is Volatile keyword used for ?Core Java
Anonymous
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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  Q6. What is reflection ?
Anonymous
Ans. It is the process of examining / modifying the behaviour of an object at runtime.

  Sample Code for reflection

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   Like         Discuss         Correct / Improve     java   reflection   reflection api   ebay   mindtree     Asked in 27 Companies      basic        frequent


 Q7. What is DTD ?Xml
Admin
info@buggybread.com
Ans. DTD or Document Type Definition is a standard agreed upon way of communication between two parties. Your application can use a standard DTD to verify that data that you receive
from the outside world is valid and can be parsed by your parser.

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   Like         Discuss         Correct / Improve     xml   markup language   dtd   document type definition   architecture


 Q8. What is XSD ?Xml
Admin
info@buggybread.com
Ans. XSD or Xml Schema Definition is an extension of DTD. XSD is more powerful and extensible than DTD

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   Like         Discuss         Correct / Improve     java   xml   markup language   xsd   dtd   architecture


 Q9. Why String is popular HashMap key in Java?Core Java
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Ans. Since String is immutable, its hashcode is cached at the time of creation and it doesnt need to be calculated again. This makes it a great candidate for key in a Map and its processing is fast than other HashMap key objects. This is why String is mostly used Object as HashMap keys.

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   Like         Discuss         Correct / Improve     java   string class   string   immutable  immutability   hashmap   immutable  immutability   hashcode   hash code   advanced     Asked in 2 Companies      expert        frequent


 Q10. What is a Cursor ?Database
Admin
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Ans. It's a facility that allows traversal over the records pulled from a table or combination of tables. Its like iterator in Java.

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   Like         Discuss         Correct / Improve     databases   sql   cursors   packages     Asked in 5 Companies      basic        frequent


 Q11. What is the difference between int[] x; and int x[]; ?Core Java
admin
info@buggybread.com
Ans. No Difference. Both are the acceptable ways to declare an array.

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   Like         Discuss         Correct / Improve     java   array   arrays   array declaration   difference between     Asked in 3 Companies      basic


 Q12. Which java frameworks have you used ?General

Ans. I have primarily worked on Web applications and hence worked on Struts , Spring , Hibernate, JSF ( Java Server Faces ) , Velocity etc.

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   Like         Discuss         Correct / Improve     elsevier   frameworks   java frameworks   general question     Asked in 3 Companies      basic        frequent


 Q13. Have you ever had any conflict with the team member (like disagreement on some design decision ) and How you reacted to it ? General2016-11-30 15:55:39

Ans. [Open Ended Answer]

This is a very sensitive question and should be dealt with caution. Just simply saying that you never had any disagreement will present you as dumb team member. Showing your self as too aggressive in such decisions will present you as a trouble maker. You should present a situation where you had an argument / disagreement but eventually you and your team mates mutually found a way out of it.

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   Like         Discuss         Correct / Improve          Asked in 20 Companies      basic


 Q14. Explain TDD or Test Driven Design ?Design

Ans. TDD is a development process that involves short iterations: first an automated test case is written. Then, the code is written to pass that test, and finally one refactors the new code to acceptable standards.

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   Like         Discuss         Correct / Improve     elsevier   test driven design ( TDD )   software development methodologies     Asked in 3 Companies        frequent


 Q15. What is Shutdown hook ?Core Java2017-01-12 14:22:44

Ans. Shutdown hook is a thread that is invoked before the JVM is shut down. we can use it perform resource cleaning task.

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   Like         Discuss         Correct / Improve     shutdown hook  jvm

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 Q16. What is Amazon S3 ?Amazon Web Services (AWS)2017-02-16 11:17:48

Ans. Amazon Simple Storage Service or S3 is object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web.

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   Like         Discuss         Correct / Improve     aws  amazon s3  aws s3  aws storage  amazon cloud storage  amazon s3     Asked in 12 Companies


 Q17. Explain Spring invoke and wait.Spring2017-04-09 08:56:55

 This question was recently asked at 'TD Ameritrade'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q18. Can we override the overloaded methods too ?Core Java2017-05-07 16:31:47

Ans. Yes. Both concepts are independent of each other. Overriding depends on the methods with same name and signature whereas Overloading on same name but with different signatures. All definitions of an overloaded method can be individually overridden in the derived class.

For example -

Class A has overloaded methods "public void myMethod(String str)" and "public void myMethod(int x)"

We can have derived class ClassB extends ClassA and hence can override both methods myMethod(String str) and myMethod(int x) in ClassB

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   Like         Discuss         Correct / Improve     overloading  overriding     Asked in 1 Companies


 Q19. What is the difference between CountingSemaphore and a CountDownLatch?Operating System2017-05-07 19:31:17

 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     CountingSemaphore  CountDownLatch


 Q20. What are the 7 OSI LAYERS ?Networking2018-11-19 14:21:40

Ans. Layer 7 - Application
Layer 6 - Presentation
Layer 5 - Session
Layer 4 - Transport
Layer 3 - Network
Layer 2 - Data Link
Layer 1 - Physical

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   Like         Discuss         Correct / Improve          Asked in 7 Companies




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