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Q181. Which Java version supports Interface Default methods ?

Core Java

Ans. Java 1.8 or Java 8

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Q182. Write a program to insert a value after a specific value in an array.

Data Structure

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Q183. Can we make array volatile in Java ?

Core Java

Ans. Yes, you can make an array (both primitive and reference type array e.g. an int array and String array) volatile in Java but only changes to reference pointing to an array will be visible to all threads, not the whole array

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Q184. Can we declare an array without assigning the size of an array?

Core Java

Ans. No, It will throw compile time error saying "must provide either dimension expressions or an array initializer"

Alternatively we can provide array initializer like

String[] strArray = new String[]{"Buggy","Bread"};

which will initialize it to size 2 with values as "Buggy" and "Bread"

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Q185. Find the length of the non repeated numbers in an array.

Data Structure

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Q186. Find number of recycled pairs in n array.

Data Structure

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Q187. In an array every element is repeated twice except one, Find that element?

Data Structure

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Q188. Difference between Arrays and LinkedList ?

Data Structure

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Q189. Can you write code to copy one array into another ?

Data Structure

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Q190. What are the different ways to avoid multi Threading related problems in Java ?

Core Java

Ans. Synchronization,
Concurrent classes,
Volatile keyword,
Implementing concurrent Lock interface,
Immutable classes

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Q191. What is Thread scheduler ?

Operating System

Ans. Thread Scheduler is the Operating System service that allocates the CPU time to the available runnable threads.

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Q192. What is Time slicing with respect to Threads ?

Operating System

Ans. Time Slicing is the process to divide the available CPU time to the available runnable threads.

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Q193. What sets you apart from other developers ?

or

What are the distinguished qualities you have ?

General

Ans. https://blog.timesunion.com/careers/the-10-most-important-personality-traits-for-career-success/633/

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Q194. How to deal with double hop authentication issue?

Authentication

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Q195. How did you use authentication in node.js ?

Node,js

Ans. Using JWT

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Q196. Have you ever worked with encrypted Tokens and How ?

Authentication

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Q197. Between Encrypted Password authentication and IP Authentication , which one would you prefer and why ?

Authentication

Ans. IP authentication is very restrictive, if IP changes for some reason then getting the new IP white listed on the server firewall could run your day pretty long. I would prefer encrypted password authentication cause it is not affected by IP changes and not limited to a white listed IP, I could use any different machine and get through authentication without any hassle.

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Q198. Explain OAuth.

Authentication

Ans. OAuth is an open-standard authorization protocol or framework that describes how unrelated servers and services can safely allow authenticated access to their assets without actually sharing the initial, related, single logon credential. Like using Google or Facebook to login to something.

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Q199. How cookies helps by storing encrypted passwords ?

Authentication

Ans. It helps user autofill password on the form where its presented for authentication

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Q200. Explain the use of Client certificates for authentication ?

Authentication

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Q201. Can an In Memory Data Management play a significant role for Big Data Analytics?

BigData

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Q202. How many VTables are there for each class ?

Core Java

Ans. There is one VTable for each class.

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Q203. What are the types of authentication used in Web services ?

Web Service

Ans. Encrypted User Name / Password
Encrypted Password within Cookie
Encrypted Tokens
IP
Client Certificates
Oauth

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Q204. What is the use of load-on-startup ?

Design

Ans. The load-on-startup element of web-app loads the servlet at the time of deployment or server start if value is positive. It is also known as pre initialization of servlet.You can pass positive and negative value for the servlet.

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Q205. What is OSGI ?

OSGI

Ans. OSGI is open service gateway initiative, its used as java framework for developing and deploying the modular softwares.

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Q206. While working on a web application, you are informed that there is no new data in Database for last few hours ? How would you go about debugging this problem ?

Solution

Ans. Will look into access logs to see if web application is getting any traffic. If not , then will inform the server support team.

Will look into intermediary infrastructure , queues , streams etc to see if there is any choke or throttle there.

If there is any throttle at any point, would make request for either debugging the cause or increasing the infrastructure. For ex - increasing shards in Kinesis.

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Q207. What are custom annotations and How can we create one ?

Core Java

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Q208. Given an Employee Table with Salary Column, Find 2nd and 5th highest salary in a particular department.

SQL

Ans. Select salary from (select salary from employee where department = order by salary desc limit 5) emp order by salary limit 1 AND Select salary from (select salary from employee where department = order by salary desc limit 2) emp2 order by salary limit 1

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Q209. How to sort objects based on one of the field ?

Core Java

Ans. Using comparable and comparator and sorted collections like TreeSet or TreeMap.

or

use stream api from java 8 onwards which internally refers to comparable and comparator through lambda expressions

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Q210. If your application has multiple databases, how many changes you have to made in Hibernate?

Hibernate

Ans. If you have mulitple Databases you just need to add multiple configuration files and create the corresponding SessionFactory object.

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