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Interview Questions and Answers

Q151. Can you explain software design principles cohesion and coupling with an example?

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Q152. In singleton Pattern framework, Web application deployed on multiple cluster server will have how many objects?

Design

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Q153. How does the @ComponentScan annotation work ?

Spring

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Q154. 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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Q155. How does relational database facilitates read optimization ?

Database

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Q156. In a file there are 1 million words . Find 10 most frequent words in that file.

Design

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Q157. 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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Q158. Difference between Scriptlet and JSTL.

Javascript

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Q159. What is difference between Spring jdbc template and Hibernate ?

Hibernate

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Q160. how does abstraction help your application ?

Core Java

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Q161. How to configure Tomcat to have number of user restrictions?

Server

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Q162. What are different methods to get the permanent gen space of running application?

Core Java

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Q163. Create a custom hashmap using synchronization.

Core Java

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Q164. What is Method overloading ?

Core Java

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Q165. What is the difference between Java and J2ee ?

Java EE

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Q166. How one dao Implementation object (singleton) can handle multiple requests?

Design Pattern

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Q167. What is an applet ?

Java EE

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Q168. What are some of the vendors providing cloud computing infrastructure ?

Server

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Q169. Difference between IAAS and PAAS ?

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Q170. What is docker ?

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Q171. What are the various security and access services provided by AWS ?

Amazon Web Services (AWS)

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Q172. What is the purpose of JDP and JDK ?

Core Java

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Q173. Explain debugging

Process

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Q174. What is composition ?

Core Java

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Sample Code for composition

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Q175. When do you use a Vector?

Core Java

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Q176. Difference between emulator and simulator.

Testing

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Q177. What are the benefits of using AWS Lambda over EC2 ?

Amazon Web Services (AWS)

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Q178. What is a CNAME alias ?

Networking

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Q179. How is RDBMS different from DBMS ?

Database

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Q180. How can we make objects if the constructor is private ?

Core Java

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