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

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Q1051. What is the concept of hibernate versioning ?

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Q1052. Create DB schema for Employee, Department.

Database

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Q1053. Differences between MongoDB and mysql.

Database

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Q1054. Where will you configure database details in tomcat server ?

Tomcat

Ans. Add a file META-INF/context.xml into the root of your web application folder, which defines database connection detail :

File : META-INF/context.xml

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Q1055. What are different awt constructs ?

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Q1056. C dynamic memory questions

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Q1057. Write program to control traffic in a parking lot.

Design

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Q1058. What is stereotype annotation ?

Spring

Ans. These annotations are used to create Spring beans automatically in the application context. The main stereotype annotation is @Component . @Controller: Which is used to create Spring beans at the controller layer. The stereotype annotations in spring are @Component, @Service, @Repository and @Controller

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Q1059. what is dispatcher servlet@componentScan use ?

Spring Framework

Ans. @ComponentScan in a Spring Application.

With Spring, we use the @ComponentScan annotation along with the @Configuration annotation to specify the packages that we want to be scanned. @ComponentScan without arguments tells Spring to scan the current package and all of its sub-packages.

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Q1060. Give specific situation about when to go for constructor based injection and setter based injection in spring.

Spring

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Q1061. Write SQL query to join 2 tables ?

SQL

Ans. Select * from table1 join Select * from table2

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Q1062. How to build a blocking queue ?

Data Structure

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Q1063. Can you give me a use case where you utilized serialization in your project code?

Core Java

Ans. we use serialization when we send response to client in JSON format.(the process of converting model object into json is nothing but serialization

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Q1064. Linked List related questions.

Data Structure

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Q1065. SQL Questions.

Database

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Q1066. Explain Working of joins in sql.

Database

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Q1067. Why do we use Hibernate ?

Hibernate

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Q1068. Have you ever worked on any project dealing with authentication and authorization ?

Authentication

Ans. Yes, I have worked on single sign on project.

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Q1069. Can we use combination of two authentication mechanism in an application ? Narrate with an example.

Authentication

Ans. Yes We can use. Negotiate is a very good example with NTLM fallback mechanism over Kerberose.

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Q1070. Give an example of a time when you recommended code changes in a code review that simplified the code ?

Code Review

Ans. If there is a situation to remove duplicates values from an arrayList. Developer implemented using legacy for-loop where I suggested to use Linked hash set to remove duplicates from the list.

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Q1071. How can we increase the speed of SQL queries ?

Database

Ans. Using -
1. Prepared Statements
2. Using Indices
3. Using whereby clause only on indexed columns

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Q1072. Find the second largest array element without sorting?

Design

Ans. We initialize two variables first and second to INT_MIN as,
first = second = INT_MIN
then Start traversing the array,
If the current element in array say arr[i] is greater
than first. Then update first and second as,
second = first
first = arr[i]
If the current element is in between first and second,
then update second to store the value of current variable as
second = arr[i]
then Return the value stored in second.

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Q1073. Why Spring boot is preferred over Spring MVC ?

Ans. Spring Boot aims to shorten the code length and provide you with the easiest way to develop a web application. It helps create a stand-alone application with less or almost zero-configuration.

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Q1074. What is Message Queue or MQ ?

Data Structure

Ans. Message queues implement an asynchronous communication pattern between two or more processes/threads whereby the sending and receiving party do not need to interact with the message queue at the same time. Messages placed onto the queue are stored until the recipient retrieves them. Message queues have implicit or explicit limits on the size of data that may be transmitted in a single message and the number of messages that may remain outstanding on the queue.

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Q1075. what annotation do in background in hibernate ?

Hibernate

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Q1076. What is the time complexity and space complexity of reversing a Linked List ?

Data Structure

Ans. o(n) for time complexity
o(1) for space complexity

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Q1077. Write an algorithm to shift a linked list n positions.

Data Structure

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Q1078. What is life cycle of cloud deployment process ?

Cloud Computing

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Q1079. What are the types of clouds in cloud computing ?

Cloud Computing

Ans. Private, Public, Hybrid, Community

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Q1080. Difference between merge and update in hibernate

Hibernate

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