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Q2281. Write a Program to print a pattern ?

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Q2282. Have you used Java 8 Lambda expressions ?

Core Java

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Q2283. Do you have any problems with your team that you plan on changing ?

General

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Q2284. What are you using AWS lambda for ?

Amazon Web Services (AWS)

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Q2285. What is the thing that would turn you off for a company ?

General

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Q2286. How do you prefer to resolve team disputes , just talking or in written ?

general

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Library Management System has always been the favorite question. This questions is asked irrespective of level.

Q2287. Write data models and service end points for Library Management System ?

Architecture

Ans. Following could be the business sub domains or database schemas in such a system

1. Users / Members
2. Sourcing
3. Inventory Management
4. Operations

Following services end points could be there

1. Users - addNewUser ( put ), removeUser ( post )
2. Sourcing - addSupplier ( put ), removeSupplier ( post )
3. Inventory Management - getInventory ( get )
4. Operations - checkIn ( post ), checkout ( post )

There could be following Tables in Database

1. Users / Members - MEMBER, MEMBERSHIP_TYPE
2. Sourcing - SUPPLIER, SUPPLIER_PRODUCT, PRODUCT_REORDER_LEVELS
3. Inventory Management - INVENTORY,PRODUCTS
4. Operations - TRANSACTION

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Q2288. Write SQL to get all members and the count of books they have checked out , even the ones that haven't checked out anything.

SQL

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Q2289. What is MVC in GUI components ?

Design

Ans. The Model/View/Controller pattern, a strategy for dividing responsibility in a GUI component.

The model is the data for the component.

The view is the visual presentation of the component on the screen.

The controller is responsible for reacting to events by changing the model.

According to the MVC pattern, these responsibilities should be handled by different objects.

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Q2290. What version of Maven are you working with ? Are you aware of changes in the most recent version of Maven ?

Maven

Ans. 3.3.9

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Q2291. Please explain with example different types of testing ?

Testing

Ans. Unit Testing ( Junits )
Integration Testing ( Testing overall flow by calling the entry method or by calling the service end point )
Manual Testing ( End to End Manual User Testing, they way eventually it will be used by end users )
Automation Testing ( Machine replication of end to end testing )

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Q2292. What is the difference between Maven and Jenkins ?

Tools

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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Q2293. 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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Q2294. How to calculate string length without using inbuilt function

Core Java

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Q2295. Write code to sort an array.

Algorithm

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

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Q2296. Difference between == and === ?

JavaScript

Ans. == compares values === is used in scripting languages for comparing two values as well as there data tpe. like in js,php.

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Q2297. 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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Q2298. 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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Q2299. 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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Q2300. 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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Q2301. What does System.exit() do ?

Core Java

Ans. Generally used to indicate termination

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Q2302. 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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Q2303. 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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Q2304. 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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Q2305. What are custom annotations and How can we create one ?

Core Java

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Q2306. What is the difference between scope and access modifiers ?

Core Java

Ans. Scope modifiers changes the scope of a particular element or a method. For ex - static changes the scope of that of class and not of object.

Access modifiers changes the access priviledges of a particular element or a method. For ex - private , public etc.

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Q2307. Why Java has final class ?

Core Java

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Q2308. 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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Q2309. Set Locators priority wise in selenium WebDriver.

Selenium

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

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Q2310. 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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