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Interview Questions and Answers for 'Atcs' - 28 question(s) found - Order By Newest

Frequently asked question in companies using Hibernate.
  Q1. What is Lazy Initialization in Hibernate ?Hibernate
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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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Very Frequently asked.
 Q2. Explain throw, throws , try and catch in Java ?Core Java
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Ans. throw is used to re throw an exception.

throws is used to declare that the method throws the respective exceptions.

try block is used to identify if the respective block has thrown any exception.

catch is used to catch the exception that has been thrown by the respective try block.

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   Like         Discuss         Correct / Improve     java   exception handling   throw   throws   try   catch     Asked in 2 Companies      basic        frequent

 Q3. If you need to consume messages from the queue faster, which approach will you recommend - batching or concurrency ?Design2017-07-24 13:34:47

Ans. Each has it's own advantages

Batching requires less resources but may result in loosing whole batch in case of failure whereas concurrency even though is little more expensive in terms of resources but would result in minimal loss in case of failure.

In case messages are to be consumed in a particular order, batching them in that order and then consuming them makes better sense.

if incoming messages are not continuous , it makes more sense to do concurrency as we need not wait for all messages to form a batch and flush. Though time sensitivity can be added but that would add unnecessary complexity.

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   Like         Discuss         Correct / Improve     concurrency vs batching   concurrency  multithreading  batch

 Q4. How can we make sure that a code segment gets executed even in case of uncatched exceptions ?
Anonymous
Ans. By putting it within finally.

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

 Q5. Is it necessary that each try block to be followed by catch block ? Core Java
Anonymous
Ans. It should be followed by either catch or finally block.

  Sample Code for Retry in case of exception

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   Like         Discuss         Correct / Improve     java   exceptions   exception handling   try   catch   finally  Oracle OCA Test     Asked in 3 Companies      basic        frequent
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 Q6. Can we have try and catch blocks within finally ?Core Java
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Ans. Yes

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   Like         Discuss         Correct / Improve     java   exceptions   exception handling   finally   try   catch   yesno

 Q7. How does a try statement determine which catch clause should be used to handle an exception?Core Java
Anonymous
Ans. When an exception is thrown within the body of a try statement, the catch clauses of the try statement are examined in the order in which they appear. The first catch clause that is capable of handling the exception is executed. The remaining catch clauses are ignored.

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   Like         Discuss         Correct / Improve     java   exceptions   exception handling   try   catch      basic        frequent

 Q8. Can finally block be used without catch ?Core Java
Anonymous
Ans. Yes but should follow "try" block then.

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 Q9. Will finally be called always if all code has been kept in try block ?Core Java
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Ans. The only time finally won't be called is if you call System.exit() or if the JVM crashes first.

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   Like         Discuss         Correct / Improve     java   exceptions   exception handling   try   catch   finally   system   system.exit

  Q10. Write a Program to check if 2 strings are Anagrams ?Core Java2016-11-30 20:52:37

Ans. public void checkIfAnagram(String str1,String str2){
boolean anagram = true;
for(char c:str1.toCharArray()){
if(!str2.contains(String.valueOf(c))){
System.out.println("Strings are Anagrams");
anagram = false;
}

if(anagram == true){
System.out.println("Strings are not Anagrams");
}
}
}

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   Like         Discuss         Correct / Improve      check if 2 strings are Anagrams     Asked in 30 Companies      basic        frequent

 Q11. What's wrong with this code ?

public static void main(String[] args) {
String regex = "(\\w+)*";
String s = "Java is a programming language.";

Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(s);
while (matcher.next()) {
System.out.println("The e-mail id is: " + matcher.group());
}
}		Core Java
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Ans. matcher.find() should have been used instead of matcher.next() within while.

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   Like         Discuss         Correct / Improve     java   regex   pattern.matcher   java.util   coding   code

 Q12. Which interfaces are implemented by BatchUpdateException?
Anonymous
Ans. [Iterable]

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   Like         Discuss         Correct / Improve     java   BatchUpdateException   include

 Q13. Which of the following is not possible ?

a. try block followed by catch
b. try block followed by finally
c. try block followed by catch block and then finally
d. try block without catch or finally block
Anonymous
Ans. try block without catch or finally block

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   Like         Discuss         Correct / Improve     exceptions   java   try-catch   finally
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 Q14. 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 Java2016-12-29 15:42:10

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

 Q15. What is the difference between CountingSemaphore and a CountDownLatch?Operating System2017-05-07 19:31:17

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   Like         Discuss         Correct / Improve     CountingSemaphore  CountDownLatch

 Q16. Given a string and index for the opening bracket, find the index of matching closing bracket. Core Java2017-05-07 20:11:06

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


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   Like         Discuss         Correct / Improve     matching bracket  stack     Asked in 1 Companies

 Q17. What is dynamic dispatch in Java ?Core Java2017-05-29 09:57:31

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


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   Like         Discuss         Correct / Improve     dynamic dispatch  runtime polymorphism  object oriented programming (oops)  oops concepts

 Q18. 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

 Q19. 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

  Q20. Write code to sort an array.Algorithm2018-07-04 16:15:16

Ans. https://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/

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   Like         Discuss         Correct / Improve     array  sorting     Asked in 16 Companies      basic        frequent

 Q21. 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

 Q22. If you have to pull a sub string out of a string, which method would you use - using String methods or Pattern / Matcher ?Design2019-01-10 09:43:14

Ans. It depends on how complex it is and if in future it would need any sort opf debugging. It's not easy to debug code if it's making heavy use of shortcuts like Lambda , Patterns etc.

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   Like         Discuss         Correct / Improve     pattern matching  String  design

 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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