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Q2011. What is the difference between Maven and Jenkins ?

Ans. Maven is a build tool whereas Jenkins is continuous integration system.

Maven deals with application compilation, build and packaging whereas Jenkins tracks SCM for triggering builds and packages, triggering parent project builds upon dependencies, initiating builds and performing alerts. So Jenkins is kind of a wrapper around SCM and Build Tool for continuous integration and deployment.

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Q2012. Can we use Prototype Bean scope with Autowiring ?

Spring

Ans. Default Bean scope in auto wiring is Singleton but Yes, that can be changed by specifying the Bean scope explicitly.

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Q2013. How to calculate string length without using inbuilt function

Core Java

^{This question was recently asked at 'Softenger'.This question is still unanswered. Can you please provide an answer.}

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_{Like Discuss Correct / Improve code coding design string length Asked in 1 Companies basic}

Q2014. Write code to sort an array.

Algorithm

Ans. https://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/

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_{Like Discuss Correct / Improve array sorting Asked in 16 Companies basic frequent}

Q2015. What is the difference between abstraction and abstract class ?

Core Java

Ans. Abstract class is one of the facility for achieving abstraction in Java.

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Q2016. Write code to print a Pyramid pattern ?

Core Java

Ans. public static void printTriagle(int n)
{
// outer loop to handle number of rows
// n in this case
for (int i=0; i1; j--)
{
// printing spaces
System.out.print(" ");
}

// inner loop to handle number of columns
// values changing acc. to outer loop
for (int j=0; j<=i; j )
{
// printing stars
System.out.print("* ");
}

// ending line after each row
System.out.println();
}
}

// Driver Function
public static void main(String args[])
{
int n = 5;
printTriagle(n);
}

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Q2017. 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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Q2018. If SOAP is more secure than Rest, Why many applications today use Rest ?

Web Service

Ans. SOAP supports only xml whereas Rest support many other formats.

Rest services are very light weight compared to SOAP.

SOAP services are code heavy as they require creation. of stubs and skeltons.

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Q2019. What does System.exit() do ?

Core Java

Ans. Generally used to indicate termination

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Q2020. What are different types of IOC containers ?

Design

Ans. J2ee Web Containers and Core Containers

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Q2021. 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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_{Like Discuss Correct / Improve sort sorting comprator comparable treeset treemap sorting collections Asked in 1 Companies Basic frequent}

Q2022. 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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_{Like Discuss Correct / Improve sql database find 2nd highest salary sql database Asked in 1 Companies}

Q2023. Difference between Component-Scan and @Component annotation ?

Spring

Ans. @component mark a java class as a bean so that component scan mechanism of spring pick it up and register in IOC container.

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Q2024. Can we have interface as a replacement for utility class ?

Core Java

Ans. Yes, With Java 8 we can use Interfaces as collection of utility methods through the use of default methods.

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Q2025. What are custom annotations and How can we create one ?

Core Java

^{This question is still unanswered. Can you please provide an answer.}

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Q2026. 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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_{Like Discuss Correct / Improve Solution Designing Solutioning Asked in 2 Companies}

Q2027. Set Locators priority wise in selenium WebDriver.

Selenium

Ans. Id locators,Name locators,CSS locators,Xpath locators,DOM locators

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Q2028. Which memory segment is cleaned by Garbage Collection - stack or heap ?

Core Java

Ans. Heap as objects are stored ink heap.

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Q2029. Have you worked on Linux Systems ?

General

^{This question was recently asked at 'HCL Technologies,Symantec'.This question is still unanswered. Can you please provide an answer.}

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Q2030. 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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_{Like Discuss Correct / Improve Asked in 23 Companies}

Q2031. 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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_{Like Discuss Correct / Improve load on startup web application Asked in 1 Companies}

Q2032. Are final methods faster than regular instance methods ?

Core Java

Ans. Yes. As they cannot be overridden , there is no use of virtual table concept which is used for dynamic binding resolution.

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_{Like Discuss Correct / Improve final methods final keyword expert}

Q2033. What is virtual table with respect to method overriding in Java ?

Core Java

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Q2034. How is the virtual method table implemented in Java?

Core Java

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Q2035. How many VTables are there for each class ?

Core Java

Ans. There is one VTable for each class.

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_{Like Discuss Correct / Improve virtual table method vtable runtime polymorphism object oriented programming (oops) oops concepts method overriding intermediate rare}

Q2036. Can an In Memory Data Management play a significant role for Big Data Analytics?

BigData

^{This question was recently asked at 'Jean Martin'.This question is still unanswered. Can you please provide an answer.}

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Q2037. Explain the use of Client certificates for authentication ?

Authentication

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Q2038. 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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_{Like Discuss Correct / Improve cookie authentication}

Q2039. Have you ever worked with encrypted Tokens and How ?

Authentication

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Q2040. How did you use authentication in node.js ?

Node,js

Ans. Using JWT

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_{Like Discuss Correct / Improve authentication node.js Asked in 2 Companies}

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