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| Interview Questions and Answers - Order By Newest | ||||
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| Ans. HBM Files ( Mapping ) DB Connection ( DB Connection String , User Name , Password , Pool Size ) SQL Dialect ( SQL variant to be generated ) Show SQL ( Show / No show SQL on Console ) Auto Commit ( True / False ) | ||||
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 Discuss Correct / Improve  hibernate configuration barclays  Asked in 11 Companies | ||||
 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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Discuss Correct / Improve web.xml servlets deployment descriptor Asked in 15 Companies  basic  frequent | ||||
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| Ans. Simple Inner Class, Local Inner Class, Anonymous Inner Class, Static Nested Inner Class. | ||||
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| Discuss Correct / Improve java inner classes classes Asked in 6 Companies basic frequent | ||||
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| Frequently asked in Indian Service Companies. Tech Mahindra ( Based on 3 inputs ) and Infosys ( 3 inputs ) | ||||
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| Ans. List - Members are stored in sequence in memory and can be accessed through index. Set - There is no relevance of sequence and index. Sets doesn't contain duplicates whereas multiset can have duplicates. Map - Contains Key , Value pairs. | ||||
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| Discuss Correct / Improve java collections list set map list vs set vs map Asked in 8 Companies basic frequent | ||||
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| Frequently asked at HCL Technologies ( Based on 3 feedback ) | ||||
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| Ans. Checked exceptions are the exceptions for which compiler throws an errors if they are not checked whereas unchecked exceptions are caught during run time only and hence can't be checked. | ||||
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| Discuss Correct / Improve java exceptions checked exceptions unchecked exceptions exception handling checked vs unchecked exceptions Asked in 39 Companies basic frequent | ||||
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| Ans. Vectors are synchronized whereas Array lists are not. | ||||
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| Discuss Correct / Improve java basic interview question vector arraylist collections synchronization vector vs arraylist Asked in 35 Companies basic frequent | ||||
| Very Frequently asked. Usually asked along with String Class related questions. | ||||
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| Ans. Class using which only immutable (objects that cannot be changed after initialization) objects can be created. | ||||
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| Discuss Correct / Improve java oops immutable immutability immutable immutability class string class basic interview question Asked in 18 Companies Basic frequent | ||||
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| Very frequently asked in phone and walk in interviews. | ||||
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| Ans. An interface without any method declaration is called as marker interface. there are 3 in-built interfaces in JVM i.e. serializable, clonable, remote | ||||
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| Discuss Correct / Improve java oops interfaces marker interface serializable clonable Asked in 21 Companies intermediate frequent | ||||
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| Very frequently asked. Usually difference between String,StringBuffer and StringBuilder is asked in different variations. | ||||
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| Ans. StringBuffer is synchronized whereas StringBuilder is not. | ||||
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| Discuss Correct / Improve java string stringbuffer string class stringbuilder synchronized basic interview question infosys technologies Asked in 17 Companies basic frequent | ||||
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| Ans. It is the process of examining / modifying the behaviour of an object at runtime. | ||||
 Sample Code for reflection | ||||
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| Discuss Correct / Improve java reflection reflection api ebay mindtree Asked in 29 Companies basic frequent | ||||
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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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| Discuss Correct / Improve get vs post web service rest Asked in 11 Companies basic frequent | ||||
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| Ans. Such a class still can have member elements which can be inherited and hence facilitate code reuse. Moreover Abstract class can have non final static elements whereas interfaces are only allowed to have static final elements. | ||||
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| Discuss Correct / Improve abstract class interfaces Asked in 2 Companies Basic | ||||
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| Ans. Prototype scope - A new object is created each time it is injected/looked up. It will use new SomeClass() each time. Singleton scope - It is the default scope. The same object is returned each time it is injected/looked up. Here it will instantiate one instance of SomeClass and then return it each time. | ||||
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| Discuss Correct / Improve Spring beans singleton bean scope prototype bean scope Asked in 1 Companies | ||||
| Very Frequently asked.Favorite question in Walk in drive for many Indian service companies. | ||||
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| Ans. A Class that cannot be sub classed. | ||||
| Sample Code for final class | ||||
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| Discuss Correct / Improve java oops final final class java keyword basic interview question Asked in 3 Companies basic frequent | ||||
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| Ans. By static import , we can access the static members of a class directly without prefixing it with the class name. | ||||
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| Discuss Correct / Improve java java5 static import static java keyword static import Asked in 4 Companies basic frequent | ||||
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| Ans. Collections class is a utility class having static methods for doing operations on objects of classes which implement the Collection interface. For example, Collections has methods for finding the max element in a Collection. | ||||
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| Discuss Correct / Improve java collections collections class collection interface basic interview question Asked in 6 Companies basic frequent | ||||
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| Ans. Collections are re-sizable in nature. We can increase or decrease the size as per recruitment. Collections can hold both homogeneous and heterogeneous data's. Every collection follows some standard data structures. Collection provides many useful built in methods for traversing,sorting and search. | ||||
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| Discuss Correct / Improve java collections collections classes advantages of collections over arrays collections vs arrays basic interview question Asked in 6 Companies basic frequent | ||||
| Very frequently asked Hibernate interview question. Frequently asked in TCS ( based on 2 feedback ) | ||||
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| Ans. There are 4 types of associations in Hibernate One to One One to Many Many to One Many to Many | ||||
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| Discuss Correct / Improve hibernate associations Asked in 11 Companies frequent | ||||
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| Ans. With Java 8, We can provide method definitions in the Interfaces that gets carried down the classes implementing that interface in case they are not overridden by the Class. Keyword "default" is used to mark the default method. | ||||
| Sample Code for interface default | ||||
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| Discuss Correct / Improve java java8 default methods Asked in 7 Companies expert frequent | ||||
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| Ans. DEBUG ERROR ALL WARN INFO FATAL OFF TRACE TRACE_INT WARN | ||||
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| Discuss Correct / Improve java log4j log4j level logging error logging Asked in 10 Companies | ||||
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| Ans. Java only provides pass by value. | ||||
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| Discuss Correct / Improve ebay pass by value pass by reference method call methods functions function call Asked in 10 Companies basic frequent | ||||
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| Ans. The external tables feature is a complement to existing SQL Loader functionality. It enables to access data in external sources as if it were in a table in the database. We have used it few times for replicating tables across different database systems. | ||||
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| Discuss Correct / Improve external table oracle Asked in 1 Companies rare | ||||
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| Ans. Earlier any class implementing an interface was supposed to implement all methods declared in an interface. There was no place for optionally implementing all or subset of methods.Though we have abstract classes wherein we could have provided such a mechanism by declaring some methods as abstract while providing definition for some. But as Abstract classes have a body and are comparatively heavier than interfaces and interfaces associate closely to the concept of providing interfacing than abstract classes, Java might have though of providing optional implementation for default methods. This way same interface can be reused in variety of ways rather than making copies of an interface to suit different needs. | ||||
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| Discuss Correct / Improve java 8 java8 interface default methods default methods Asked in 6 Companies | ||||
| Very Frequently asked to Senior Software Engineers or Developers. | ||||
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| Ans. [Open Ended Answer] | ||||
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| Discuss Correct / Improve design patterns Asked in 17 Companies intermediate frequent | ||||
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| Ans. public class BuggyBread { public static void main(String args[]) { System.out.println(factorial(5)); } private static int factorial(int number){ if(number == 1){ return 1; } else { return number * factorial(number - 1); } } } | ||||
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| Discuss Correct / Improve recursion Asked in 25 Companies | ||||
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| Ans. Selenium WebDriver is a tool for automating web application testing.It helps in replicating the manual tester behavior like keyboard entry, mouse events etc and then matching the output against the expected. | ||||
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| Discuss Correct / Improve selenium webdriver Asked in 37 Companies | ||||
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| Ans. Amazon Simple Storage Service or S3 is object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web. | ||||
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| Discuss Correct / Improve aws amazon s3 aws s3 aws storage amazon cloud storage amazon s3 Asked in 12 Companies | ||||
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| Ans. Abstraction is a process of hiding the implementation details and describing only the functionality to the user. | ||||
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| Discuss Correct / Improve bstraction oops concepts oops principle Asked in 22 Companies | ||||
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| Ans. No | ||||
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| Discuss Correct / Improve abstract class multiple inheritance object oriented programming (oops) oops concepts Asked in 2 Companies | ||||
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| Ans. WEB APP |WEB-INF - META-INF | | | META-INF.MF | lib - WEB.xml - Classes | ||||
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| Discuss Correct / Improve web application Asked in 3 Companies intermediate frequent | ||||
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Which of the following file is called deployment descriptor ?
