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Interview Questions and Answers for 'Dws' - 28 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. Favorite question in Walk in Drive of many Indian service companies. Frequently asked in HCL Technologies, TCS and Accenture.
  Q2. What is the difference between final, finally and finalize() ?Core Java
Admin
info@buggybread.com
Ans. final - constant variable, objects cannot be de-referenced, restricting method overriding, restricting class sub classing.

finally - handles exception. The finally block is optional and provides a mechanism to clean up regardless of what happens within the try block. Use the finally block to close files or to release other system resources like database connections, statements etc.

finalize() - method helps in garbage collection. A method that is invoked before an object is discarded by the garbage collector, allowing it to clean up its state.

  Sample Code for final

  Sample Code for finally

  Sample Code for finalize

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   Like         Discuss         Correct / Improve     java   oops   final   finally   finalize     Asked in 60 Companies      basic        frequent

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  Q3. Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about OOPs
Core Java2017-06-13 08:25:45

Ans. OOPs or Object Oriented Programming is a Programming model which is organized around Objects instead of processes. Instead of a process calling series of processes, this model stresses on communication between objects. Objects that all self sustained, provide security by encapsulating it's members and providing abstracted interfaces over the functions it performs. OOP's facilitate the following features

1. Inheritance for Code Reuse
2. Abstraction for modularity, maintenance and agility
3. Encapsulation for security and protection
4. Polymorphism for flexibility and interfacing

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   Like         Discuss         Correct / Improve     oops  oops features     Asked in 235 Companies      basic        frequent


Almost sure to be asked in every company using any Dependency Injection framework ( Spring, Guice etc )
  Q4. 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 80 Companies      intermediate        frequent


  Q5. Difference between Vector and ArrayList ?Core Java
Anonymous
Ans. Vectors are synchronized whereas Array lists are not.

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   Like         Discuss         Correct / Improve     java   basic interview question   vector   arraylist   collections   synchronization     Asked in 34 Companies      basic        frequent


Very frequently asked.Usually among first few questions.
  Q6. What is MVC ? Design
Anonymous
Ans. MVC is a Design Pattern that facilititates loose coupling by segregating responsibilities in a Web application

1. Controller receives the requests and handles overall control of the request
2. Model holds majority of the Business logic, and
3. View comprise of the view objects and GUI component

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   Like         Discuss         Correct / Improve     j2ee   mvc   mvc design pattern   design pattern   struts   spring   web application   web frameworks   ebay     Asked in 60 Companies      basic        frequent

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 Q7. Tell something about BufferedWriter ? What are flush() and close() used for ?
Admin
info@buggybread.com
Ans. BufferedWriter is temporary source for data storage.BufferedWriter is used to write character data to the file.Flush() is method available in B.W which ensures that all data items are written to file including last character.Close() is used to closes the character output stream.

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   Like         Discuss         Correct / Improve     java   java io   input output   file handling   file io   output stream   bufferedwriter   flush   close


 Q8. Which of the following code is correct ?

a.


FileWriter fileWriter = new FileWriter("../file.txt");
File file = new File(fileWriter );
BufferedWriter bufferedOutputWriter = new BufferedWriter(fileWriter);

b.

BufferedWriter bufferedOutputWriter = new BufferedWriter("../file.txt");
File file = new File(bufferedOutputWriter );
FileWriter fileWriter = new FileWriter(file);


c.

File file = new File("../file.txt");
FileWriter fileWriter = new FileWriter(file);
BufferedWriter bufferedOutputWriter = new BufferedWriter(fileWriter);

d.

File file = new File("../file.txt");
BufferedWriter bufferedOutputWriter = new BufferedWriter(file);
FileWriter fileWriter = new FileWriter(bufferedOutputWriter );
Core Java
Admin
info@buggybread.com
Ans. c.

File file = new File("../file.txt");
FileWriter fileWriter = new FileWriter(file);
BufferedWriter bufferedOutputWriter = new BufferedWriter(fileWriter);

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   Like         Discuss         Correct / Improve     java   io   file   fileio   coding   code   filewriter   bufferedwriter   scjp   ocjp  file handling


 Q9. Difference between Stack and Heap memory ?Core Java
Admin
info@buggybread.com
Ans. Stack memory areas is used to hold method and local variables while objects are always allocated memory in the heap. The heap memory is shared between multiple threads whereas Stack memory isn't.

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   Like         Discuss         Correct / Improve     java   memory management   stack memory   heap memory   difference between   ebay     Asked in 2 Companies      intermediate        frequent

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 Q10. What is used to segregate load between multiple servers ?

a. Load Server
b. Load Manager
c. Load Traversal
d. Load Balancer
Anonymous
Ans. Load Balancer

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   Like         Discuss         Correct / Improve     server   server hardware


 Q11. What was the driving force to introduce default methods in Interfaces wef from Java 8 ?Core Java2016-07-14 14:36:49

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


 Q12. How and when the Buffer is cleared when using Buffered Writer Classes ?Core Java2016-08-08 11:26:13

Ans. Buffer is cleared in 2 circumstances, i.e 1. naturally when the buffer is filled and 2. explicitly when the method flush is called ( for flushing the residual )

Ideally we just need to call flush once at the end of file writing so that the residual content should be dumped to file.

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   Like         Discuss         Correct / Improve     BufferedWriter  Writer  PrintWriter  File io  flush  file handling


 Q13. What is a factory design pattern ?Design2017-01-09 13:21:43

Ans. Factory Design Patterns is the pattern that recommends creation of separate Factory Object for creation of other object.

So its like saying - If you want to create an object of ClassA, Talk to FactoryObject ( which is an object of FactoryClass ). FactoryObject in itself encapsulates the inputs and logic required to make the decision regarding the creation and construction of object.

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   Like         Discuss         Correct / Improve     design pattern  factory design pattern     Asked in 9 Companies


  Q14. What is the difference between authentication and authorization ?Authentication2017-01-23 12:56:23

Ans. Authentication is the process of verifying the identity and credentials of the user to authenticate him into the system.

whereas

Authorization is the process by which access to a segment , method or resource is determined.

Authorization is usually a step next to authentication.

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   Like         Discuss         Correct / Improve     authentication  authorization  authentication vs authorization     Asked in 9 Companies      basic        frequent


 Q15. How do you check logs for your application in AWS ?Amazon Web Services (AWS)2017-06-02 12:57:26

Ans. We can do it by either going to Elastic Beanstalk -> Respective instance -> Logs

or using CloudWatch -> Logs -> Respective Log Group

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   Like         Discuss         Correct / Improve     aws logs  cloudwatch logs  elastic beanstalk


 Q16. What is AWS CloudWatch ?Amazon Web Services (AWS)2017-06-04 14:51:00

Ans. Amazon CloudWatch is a monitoring service for AWS cloud resources like Beanstalk and DB instances. We can use CloudWatch to monitor the state of resources, collect metrices, set alarms and appropriate response to the alarm state.

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   Like         Discuss         Correct / Improve     aws cloudwatch  amazon cloudwatch  aws


 Q17. What is the difference between developer token and refresh token ?Adwords2018-03-29 19:21:28

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


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 Q18. What is the difference between accessing Google Apis using client key / secrets and service account ?Adwords2018-03-29 19:22:19

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


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 Q19. What is the difference between Google Adwords and Adsense ?Adwords2018-03-29 19:22:48

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


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 Q20. what are the different criterions that can be specified while updating bids ?Adwords2018-04-04 19:54:57

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


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 Q21. What is the difference between bid modifier and bid adjustment ?Adwords2018-04-04 19:55:21

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


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 Q22. How can we schedule Lambda function to run daily ?Amazon Web Services (AWS)2018-10-26 11:41:04

Ans. We can schedule that through CloudWatch.

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   Like         Discuss         Correct / Improve     lambda function  aws lambda  aws serverless computing  amazon cloud serverless computing  amazon lambda function  aws cloudwatch  amazon cloudwatch


 Q23. Which AWS service can be used for creating Billing Alarms ?Amazon Web Services (AWS)2019-01-14 13:46:06

Ans. AWS CloudWatch

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   Like         Discuss         Correct / Improve     aws cloudwatch  amazon cloudwatch


 Q24. Which AWS service can be used to monitor EC2 ?Amazon Web Services (AWS)2019-01-17 20:59:02

Ans. CloudWatch

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2  aws cloudwatch  amazon cloudwatch


 Q25. Are CloudWatch metrics available with free tier ?Amazon Web Services (AWS)2019-01-18 13:20:09

Ans. Only Basic not advanced

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   Like         Discuss         Correct / Improve     aws cloudwatch  amazon cloudwatch


 Q26. What are the Default metrics available for EC2 in CloudWatch ?Amazon Web Services (AWS)2019-01-18 13:20:54

Ans. CPU, Disk, Network, Status

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   Like         Discuss         Correct / Improve     aws cloudwatch  amazon cloudwatch


 Q27. How frequently Cloudwatch monitor AWS services for generating metrics ?Amazon Web Services (AWS)2019-01-18 13:21:47

Ans. 5 mins for Standard / Basic
1 min for Detailed / advanced

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   Like         Discuss         Correct / Improve     aws cloudwatch  amazon cloudwatch


 Q28. Difference between CloudWatch and CloudTrail ?Amazon Web Services (AWS)2019-01-18 13:22:32

Ans. CloudWatch is for monitoring resources whereas CloudTrail is for auditing activity.

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   Like         Discuss         Correct / Improve     aws cloudwatch  amazon cloudwatch  aws cloudtrail  aws cloudwatch  amazon cloudwatch vs aws cloudtrail




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