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Interview Questions and Answers for 'Web' - 386 question(s) found - Order By Newest | ||||
Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback ) and Epam Systems | ||||
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Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory. x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object. Sample code: String x = new String("str"); String y = new String("str"); System.out.println(x == y); // prints false System.out.println(x.equals(y)); // prints true | ||||
Sample Code for equals | ||||
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Like Discuss Correct / Improve  java   string comparison   string   object class   ==   equals   object equality  operator   == vs equals   equals vs == Asked in 294 Companies basic   frequent | ||||
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Ans. OOPs or Object Oriented Programming is a Programming model which is organized around Objects instead of processes. Instead of a process calling series of processes, this model stresses on communication between objects. Objects that all self sustained, provide security by encapsulating it's members and providing abstracted interfaces over the functions it performs. OOP's facilitate the following features 1. Inheritance for Code Reuse 2. Abstraction for modularity, maintenance and agility 3. Encapsulation for security and protection 4. Polymorphism for flexibility and interfacing | ||||
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Like Discuss Correct / Improve  oops  oops features Asked in 260 Companies basic   frequent | ||||
Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. Frequently asked in HCL Technologies, TCS and Accenture. | ||||
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Ans. final - constant variable, objects cannot be de-referenced, restricting method overriding, restricting class sub classing. finally - handles exception. The finally block is optional and provides a mechanism to clean up regardless of what happens within the try block. Use the finally block to close files or to release other system resources like database connections, statements etc. finalize() - method helps in garbage collection. A method that is invoked before an object is discarded by the garbage collector, allowing it to clean up its state. | ||||
Sample Code for final Sample Code for finally Sample Code for finalize | ||||
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Like Discuss Correct / Improve  java   oops   final   finally   finalize   final vs finally vs finalize Asked in 61 Companies basic   frequent | ||||
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Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews. | ||||
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Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ). A class can extend single abstract class whereas it can implement multiple interfaces. | ||||
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Like Discuss Correct / Improve  java   classes   abstract class   interfaces   abstract class vs interface   abstract classes vs interfaces Asked in 82 Companies basic   frequent | ||||
Recently asked in TCS , Tech Mahindra, HCL , Accenture and Fidelity. | ||||
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Ans. The DispatcherServlet configured in web.xml file receives the request. The DispatcherServlet finds the appropriate Controller with the help of HandlerMapping and then invokes associated Controller. Then the Controller executes the logic business logic and then returns ModeAndView object to the DispatcherServlet. The DispatcherServlet determines the view from the ModelAndView object. Then the DispatcherServlet passes the model object to the View. The View is rendered and the Dispatcher Servlet sends the output to the Servlet container. Finally Servlet Container sends the result back to the user. | ||||
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Like Discuss Correct / Improve  j2ee   spring   mvc   frameworks   web applications   architecture Asked in 11 Companies Basic   frequent | ||||
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Ans. Session tracking is a mechanism that servlets use to maintain state about a series requests from the same user across some period of time. The methods used for session tracking are: User Authentication - occurs when a web server restricts access to some of its resources to only those clients that log in using a recognized username and password Hidden form fields - fields are added to an HTML form that are not displayed in the client's browser. When the form containing the fields is submitted, the fields are sent back to the server URL rewriting - every URL that the user clicks on is dynamically modified or rewritten to include extra information. The extra information can be in the form of extra path information, added parameters or some custom, server-specific URL change. Cookies - a bit of information that is sent by a web server to a browser and which can later be read back from that browser. HttpSession- places a limit on the number of sessions that can exist in memory. | ||||
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Like Discuss Correct / Improve  j2ee   servlets   session   session management   web applications   cookies   httpsession   url rewriting   architecture Asked in 1 Companies | ||||
Very frequently asked in companies using SOA. | ||||
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Ans. REST or Representational State Transfer is a flexible architecture style for creating web services that recommends the following guidelines - 1. http for client server communication, 2. XML / JSON as formatiing language , 3. Simple URI as address for the services and, 4. stateless communication. | ||||
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Like Discuss Correct / Improve  java   web services   rest   java   j2ee  architecture Asked in 14 Companies intermediate   frequent | ||||
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Ans. EFS is file storage whereas S3 is object storage. EFS is filesystem presented over IP network as normal OS drive, while S3 is HTTP accessed store. EFS is capable of being mounted whereas S3 doesn't. S3 has capabilities beyond just filesystem, there is whole metadata part where you can store info about your objects in S3. As S3 is accessed over http , it's capable of hosting a static web site on it's own whereas EFS needs a computing and frontend service to have such capability. | ||||
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Like Discuss Correct / Improve  aws s3  aws storage  amazon cloud storage  amazon s3  aws ehs  aws s3  aws storage  amazon cloud storage  amazon s3 vs aws efs | ||||
Very frequently asked.Usually among first few questions. | ||||
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Ans. MVC is a Design Pattern that facilititates loose coupling by segregating responsibilities in a Web application 1. Controller receives the requests and handles overall control of the request 2. Model holds majority of the Business logic, and 3. View comprise of the view objects and GUI component | ||||
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Like Discuss Correct / Improve  j2ee   mvc   mvc design pattern   design pattern   struts   spring   web application   web frameworks   ebay Asked in 60 Companies basic   frequent | ||||
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Ans. AMI is an Amazon Machine Image. It contains the configuration to enable to boot up an EC2 instance with said configuration whereas Cloud formation is a templating language that allows to describe how to build a VPC and also allows you to create AWS services AMI is templating specific to instances whereas the scope of CloudFormation templating is much bigger. CloudFormation could use AMI for launching instances along with other services. | ||||
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Ans. They are wrappers to primitive data types. They allow us to access primitives as objects. | ||||
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Like Discuss Correct / Improve  java   data types   wrapper classes Asked in 3 Companies basic   frequent | ||||
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Ans. Cookie and Session are used to store the user information. Cookie stores user information on client side and Session does it on server side. Primarily, Cookies and Session are used for authentication, user preferences, and carrying information across multiple requests. Session is meant for the same purpose as the cookie does. Session does it on server side and Cookie does it on client side. One more thing that quite differentiates between Cookie and Session. Cookie is used only for storing the textual information. Session can be used to store both textual information and objects. | ||||
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Like Discuss Correct / Improve  session   session management   java   cookies   authentication   web application   ebay intermediate | ||||
Frequently asked. Among first few questions in the J2EE segment of interview. | ||||
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Ans. Deployment Descriptor which is usually web.xml is used to specify the classes, resources and configuration of the application and how the web server uses them to serve web requests.This file is usually added to WEB-INF folder and contains following * Servlet entries and url mapping * Plugins * Some info regarding authentication / filters * Landing Page * Event Handlers | ||||
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Like Discuss Correct / Improve  web.xml   servlets  deployment descriptor Asked in 15 Companies basic   frequent | ||||
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Ans. CloudFront for Static Media and cached content EC2 and EKS ( Docker ) for main application computing RDS and DynamoDB for Database Lambda ( computing ) for running back end cron jobs Kinesis for streaming and SQS for queuing CloudWatch for Monitoring CloudFormation for Infrastructure templating S3 for Object Storage | ||||
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Ans. A Region is a Geographical entity like US-East , US-West etc. Each Region may have multiple availability zones where each zone comprise of 1 or more Data Center located with each other. Edge Locations are the sites that hosts cached content for faster delivery and for saving network traffic as they feed content from sites that are local or near to consumption. | ||||
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Like Discuss Correct / Improve  aws region  aws availability zone  aws edge location  region vs availabillity zone | ||||
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Ans. S3 Standard S3 IA - Infrequently Accessed S3 One Zone IA - One Zone only , Infrequently Accessed S3 Glacier - achieved S3 Standard is most expensive , Glacier is least expensive | ||||
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Ans. Storage Tier ( IA , Standard , Glacier etc ) Storage ( Volume of Data ) No of Requests Meta Data Data Transfer Speed acceleration through cache and Edge Location | ||||
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Ans. EC2 - Time and Reservation , Instance Type ( Memory , Computation power ) S3 - Accessibility Frequency , Data Transfer , Storage Space CloudFront - Geography, No of Locations EBS - IOPS, Access Frequency | ||||
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Ans. Simple Weighted Latency Failover GeoLocation Multivalue | ||||
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Ans. A VPC is devided into multiple subnets. Subnet in a particular VPC could be public or private. For Example - A particular account may have multiple vpc's for each of the business type. For each Business or VPC , One can have different subnets to cater to each department so that access across departments could be restricted. But still there could be identities that have control over different subnets. Moreover we could have multiple subnets for each department so as to have distinguished public and private networks having different types of applications ( public facing or internal consumption ) | ||||
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Ans. Web server. | ||||
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Ans. The jsp scriptlet tag can only declare variables not methods whereas jsp declaration tag can declare variables as well as methods. The declaration of scriptlet tag is placed inside the _jspService() method whereas The declaration of jsp declaration tag is placed outside the _jspService() method. | ||||
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Ans. GET is supposed to get information from the server. Client sends the minimal information so that Server can respond with the response body on basis of request. For example - You want to get complete employment record for employee id 123 POST is supposed to send the information for submission. Payload or a Body is usually sent so that it can be persisted on the server. For example - Sending the complete information of an employee ( id, name , dept etc ) to the server for persisting it. | ||||
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Like Discuss Correct / Improve  get vs post   web service   rest Asked in 11 Companies basic   frequent | ||||
Usually asked to entry level software developers. | ||||
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Ans. public static void main(String[] args) { int num1 = 1; int num2 = 2; num1 = num1^num2; num2 = num1^num2; num1 = num1^num2; System.out.print("num1 = " + num1 +", num2 = "+num2); } | ||||
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Like Discuss Correct / Improve  code  coding Asked in 37 Companies basic   frequent | ||||
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Ans. Single instance means there is only 1 instance that will bear all the traffic load whereas Load balanced server means that there will be a cluster of servers that will host the application and load will be balanced distributed among them. Auto Scaling means that the number of instances will be expanded / shrunken based on the rule. Rule could be the traffic count , response time etc. | ||||
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Like Discuss Correct / Improve  load balancing  auto scaling  aws  elastic beanstalk | ||||
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Ans. Cloud Computing is a way of using IT infrastructure with following traits - 1. On Demand Infrastructure 2. Broad Network Access 3. Resource Pooling 4. Rapid Elasticity 5. Measured Service | ||||
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Like Discuss Correct / Improve  google cloud platform (GCP)  Amazon Web Services (AWS | ||||
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Ans. AWS provides various types of services like Computing ( EC2 , Lambda , EKS ), Storage ( S3, Glacier ), Database ( RDS , DynamoDB ), Streaming ( Kinesis ), Queue ( SQS ), Security and Access ( IAM ) etc. | ||||
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Ans. Warm up time for certain technologies like Java ( JVM Warmup ) Performance Size of Deployable ( Bigger size packaging should go in S3 ) | ||||
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Like Discuss Correct / Improve  serverless technologies  aws lambda  aws serverless computing  amazon cloud serverless computing  amazon lambda Asked in 1 Companies | ||||
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Ans. Cloud Formation does not have any additional cost but you are charged for the underlying resources it builds. | ||||
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Like Discuss Correct / Improve  aws cloud formation | ||||
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Ans. In AWS Lambda we can run a function in synchronous or asynchronous mode. In synchronous mode, if AWS Lambda function fails, then it will just give an exception to the calling application. In asynchronous mode, if AWS Lambda function fails then it will retry the same function at least 3 times.If AWS Lambda is running in response to an event in Amazon DynamoDB or Amazon Kinesis, then the event will be retried till the Lambda function succeeds or the data expires. In DynamoDB or Kinesis, AWS maintains data for at least 24 hours. | ||||
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