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Interview Questions and Answers

Q151. In singleton Pattern framework, Web application deployed on multiple cluster server will have how many objects?

Design

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Q152. How does the @ComponentScan annotation work ?

Spring

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Q153. What is read and write optimization in relation to databases ? Which database facilitates read optimization and which facilitates write optimization ?

Database

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Q154. How does relational database facilitates read optimization ?

Database

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Q155. Write an efficient program for printing k largest elements in an array. Elements in array can be in any order.

Data Structure

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Q156. Difference between Scriptlet and JSTL.

Javascript

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Q157. What is difference between Spring jdbc template and Hibernate ?

Hibernate

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Q158. how does abstraction help your application ?

Core Java

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Q159. How to configure Tomcat to have number of user restrictions?

Server

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Q160. What are different methods to get the permanent gen space of running application?

Core Java

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Q161. Create a custom hashmap using synchronization.

Core Java

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Q162. What is Method overloading ?

Core Java

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Q163. What is the difference between Java and J2ee ?

Java EE

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Q164. How one dao Implementation object (singleton) can handle multiple requests?

Design Pattern

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Q165. What is an applet ?

Java EE

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Q166. What are some of the vendors providing cloud computing infrastructure ?

Server

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Q167. Difference between IAAS and PAAS ?

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Q168. What is docker ?

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Q169. What are the various security and access services provided by AWS ?

Amazon Web Services (AWS)

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Q170. What is the purpose of JDP and JDK ?

Core Java

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Q171. Explain debugging

Process

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Q172. What is composition ?

Core Java

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Sample Code for composition

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Q173. Difference between emulator and simulator.

Testing

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Q174. What are the benefits of using AWS Lambda over EC2 ?

Amazon Web Services (AWS)

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Q175. What is a CNAME alias ?

Networking

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Q176. How is RDBMS different from DBMS ?

Database

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Q177. How can we make objects if the constructor is private ?

Core Java

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Q178. Explain Binary Search

Algorithm

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Q179. What are micro services ?

Web Service

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Q180. What is the use of Log4j ?

Logging

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