Interview Questions and Answers for 'At' | Search Interview Question

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Q991. Which s/w is used for adhar card verification for amount transfer?

Ans. The Aadhaar enabled Payment System or AePS

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Q992. Isnt the use of HashTable and ConcurrentHashMap the same, i.e providing synchronized map collection ?

Core Java

Ans. Both provide the thread safety but the actual difference come when talk about performance. CHM gives best performance when no of writer threads are less in number.

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Q993. Write a Program to Find the maximum sum of the sub array ?

Data Structure

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Q994. What is Entity in hibernate?

Hibernate

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Q995. How can we schedule Lambda function to run daily ?

Amazon Web Services (AWS)

Ans. We can schedule that through CloudWatch.

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Q996. Explain hibernate associations.

Hibernate

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Q997. How can you verify if there were interactions with a static method using PowerMock ?

PowerMock

Ans. We can use PowerMockito.verifyStatic for this purpose

PowerMockito.verifyStatic(VerificationModeFactory.times(1));
<Class_Name>.<static_method_name>;

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Q998. What is @EnableSptringMVC ?

Spring

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Q999. What is the Main Advantage of the native Key Word?

Core Java

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Q1000. Detect a loop in a linked list

Data Structure

Ans. Work with two pointers on the linked list - a slow pointer (increments by one node) and a fast pointer (increments by two nodes). If both of these pointers meet at the same node, then there is a cycle in the linked list. Otherwise, no cycle.

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Q1001. Difference between indexing and partioning

Database

Ans. Creating an index creates a separate table. ... Indexes are used to speed the search of data within tables. Partitions provide segregation of the data at the hdfs level, creating sub-directories for each partition. Partitioning allows the number of files read and amount of data searched in a query to be limited

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Q1002. What is XSS or Cross site scripting ?

Security

Ans. XSS or cross site scripting is a javascript vulnerability in web applications. The easiest way to explain this is with a case when the user enters a script in the client side input fields and that input gets processed without getting validated. This leads to untrusted data getting saved and executed on the client side.

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Q1003. Explain Hibernate caching mechanism

Hibernate

Ans. Every fresh session having its own cache memory, Caching is a mechanism for storing the loaded objects into cache memory. The advantage of cache mechanism is, whenever again we want to load the same object from the database then instead of hitting the database once again, it loads from the local cache memory only, so that the no. of round trips between an application and a database server got decreased. It means caching mechanism increases the performance of the application.

In hibernate we have two levels of caching

First Level Cache [ or ] Session Cache
Second Level Cache [ or ] Session Factory Cache [ or ] JVM Level Cache

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Q1004. Does it make sense to mock integration calls during stress / load test ?

Testing

Ans. No, its usually not done.

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Q1005. Implement a Stack with 2 threads in which one thread push data and another pop data.

Data Structure

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Q1006. Explain different inheritance mapping strategies with JPA / Hibernate.

Hibernate

Ans. table per hierarchy
table per concrete class
table per sub class

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Q1007. What is elasticity in relation to Cloud infrastructure ?

Cloud Computing

Ans. The power to scale computing resources up and down easily with minimal friction

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Q1008. Pascal Triangle Program

Ans. package snippet;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Pascal {
   public static void main(String[] args) {

      System.out.println(generatePascalTriangle(5));

   }

   static Map> generatePascalTriangle(int size) {
      Map> triangle = new HashMap<>();

      triangle.put(0, Arrays.asList(1));
      triangle.put(1, Arrays.asList(1, 1));

      for (int i = 2; i <= size; i ) {
         List coeffListForI = new ArrayList<>();
         List coeffListForI_1 = triangle.get(i - 1);
         coeffListForI.add(1);
         for (int j = 0; j <= coeffListForI_1.size() - 2; j ) {
            coeffListForI.add(coeffListForI_1.get(j) coeffListForI_1.get(j 1));
         }
         coeffListForI.add(1);
         triangle.put(i, coeffListForI);
      }

      return triangle;
   }
}

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Q1009. What is Queue ?

Data Structure

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Q1010. Can we serialize objects with only private variables in Java ?

Core Java

Ans. It depends on how we are serializing. The Serialization API doesn't worry about private variables and convert it into binary representation.

If we are using a library to map it to JSON / XML using XML Mappers, it may create trouble.

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Q1011. If you have to pull a sub string out of a string, which method would you use - using String methods or Pattern / Matcher ?

Design

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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Q1012. How did you use Spring in your project ? Which Spring annotations have you used in your project ?

Spring

Ans. @RequestMappping

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Q1013. Which AWS service is provided by Edge location ?

Amazon Web Services (AWS)

Ans. As Edge location only host cached content, Amazon CDN service or CloudFront is provided on these locations.

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Q1014. Which AWS service can be used for creating Billing Alarms ?

Amazon Web Services (AWS)

Ans. AWS CloudWatch

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Q1015. What is the use case for "Dedicated Host" EC2 plan ?

Amazon Web Services (AWS)

Ans. If there are regulatory requirements, or proprietary license to be used.

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Q1016. What is the use case of S3 Cross Region replication ?

Amazon Web Services (AWS)

Ans. Disaster Recovery and availability

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Q1017. Which AWS services provide automated backups ?

Amazon Web Services (AWS)

Ans. RDS, RedShift and Elastic Cache

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Q1018. How can EBS Volumes be backed up ?

Amazon Web Services (AWS)

Ans. Through Snapshots

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Q1019. What is the name of DNS service provided by AWS ?

Amazon Web Services (AWS)

Ans. Route 53

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Q1020. Which AWS service can be used to monitor EC2 ?

Amazon Web Services (AWS)

Ans. CloudWatch

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