Interview Questions and Answers for 'Atcs' | Search Java Interview Question

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

^{Admin
info@buggybread.com}

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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Very Frequently asked.

Q2. Explain throw, throws , try and catch in Java ?

Core Java

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info@buggybread.com}

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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Q3. If you need to consume messages from the queue faster, which approach will you recommend - batching or concurrency ?

Design

^{2017-07-24 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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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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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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Q6. Can we have try and catch blocks within finally ?

Core Java

^{Admin
info@buggybread.com}

Ans. Yes

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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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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

^{Admin
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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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Q10. Write a Program to check if 2 strings are Anagrams ?

Core Java

^{2016-11-30 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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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

^{Admin
info@buggybread.com}

Ans. matcher.find() should have been used instead of matcher.next() within while.

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Q12. Which interfaces are implemented by BatchUpdateException?

^Anonymous

Ans. [Iterable]

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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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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 Java

^{2016-12-29 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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Q15. What is the difference between CountingSemaphore and a CountDownLatch?

Operating System

^{2017-05-07 19:31:17}

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

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Q16. Given a string and index for the opening bracket, find the index of matching closing bracket.

Core Java

^{2017-05-07 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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Q17. What is dynamic dispatch in Java ?

Core Java

^{2017-05-29 09:57:31}

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

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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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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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OpenXava

SPRING MVC

Apache Stripes

Check everything
that is Best in Java

Click Here

Q20. Write code to sort an array.

Algorithm

^{2018-07-04 16:15:16}

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

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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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Q22. If you have to pull a sub string out of a string, which method would you use - using String methods or Pattern / Matcher ?

Design

^{2019-01-10 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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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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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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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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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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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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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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