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Interview Questions and Answers - Order By Newest | ||||
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 | ||||
Very Frequently asked across all type of companies and across all levels. | ||||
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Ans. Private - Not accessible outside object scope. Public - Accessible from anywhere. Default - Accessible from anywhere within same package. Protected - Accessible from object and the sub class objects. | ||||
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Like Discuss Correct / Improve  java   oop   access specifier   public   private   default   protected   public vs private vs default vs protected Asked in 12 Companies basic   frequent | ||||
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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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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. Vectors are synchronized whereas Array lists are not. | ||||
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Like Discuss Correct / Improve  java   basic interview question   vector   arraylist   collections   synchronization   vector vs arraylist Asked in 35 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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Like Discuss Correct / Improve  java   reflection   reflection api   ebay   mindtree Asked in 29 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. ClassNotFoundException is an exception that occurs when we try to load a class at run time using Class.forName() or loadClass() methods and mentioned classes are not found in the classpath. NoClassDefFoundError is an error that occurs when a particular class is present at compile time, but was missing at run time. | ||||
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Like Discuss Correct / Improve  exception handling  ClassNotFoundException  NoClassDefFoundError Asked in 1 Companies | ||||
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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Like 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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Like Discuss Correct / Improve  java   java8   default methods Asked in 7 Companies expert   frequent | ||||
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Ans. Jar is Java Archieve i.e compressed Class or Class / Java files. War comprises of compressed Servlet class files,JSP FIles,supporting files, GIF and HTML files. Ear comprise of compressed Java and web module files ( was files ). | ||||
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Like Discuss Correct / Improve  java   j2ee   jar   web development   war   ear   build management   release management Asked in 12 Companies basic   frequent | ||||
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Ans. https://en.wikipedia.org/wiki/Database_normalization | ||||
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Like Discuss Correct / Improve  normalization  database Asked in 35 Companies intermediate   frequent | ||||
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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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Ans. A cookie is a small piece of text stored on a user's computer by the browser for a specific domain. Commonly used for authentication, storing site preferences, and server session identification. | ||||
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Like Discuss Correct / Improve  cookie   javascript   web application   session management   browser   j2ee Asked in 16 Companies basic   frequent | ||||
Frequently asked. | ||||
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Ans. Iterator is an interface that provides methods to iterate over any Collection. | ||||
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Like Discuss Correct / Improve  java   collections   iterator Asked in 11 Companies basic   frequent | ||||
Very Frequently asked Spring question. | ||||
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Ans. The Spring container is able to autowire relationships between collaborating beans. This means that it is possible to automatically let Spring resolve collaborators (other beans) for your bean by inspecting the contents of the BeanFactory without using | ||||
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Like Discuss Correct / Improve  j2ee   spring   mvc   frameworks   web applications   autowiring   beans   at&t   ge Asked in 9 Companies   frequent | ||||
Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions. | ||||
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Ans. A Class must override the hashCode method if its overriding the equals method. | ||||
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Like Discuss Correct / Improve  java   collections   hashcode  hash code   equals   collections Asked in 44 Companies intermediate   frequent | ||||
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Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback) | ||||
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Ans. http://www.buggybread.com/2014/03/java-design-pattern-singleton-interview.html | ||||
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Like Discuss Correct / Improve  java   design pattern   singleton   at&t   ebay  fidelity india  united healthcare india Asked in 46 Companies intermediate   frequent | ||||
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Ans. Fail Safe systems are tolerant systems that continue processing even if they sense any problem. the objective here is to continue with the processing even if there are some problems instead of completely shutting it down. Example could be to catch an exception and still letting it complete with partial results. | ||||
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Like Discuss Correct / Improve  fail safe systems   system design   exception handling Asked in 3 Companies | ||||
Must know at all levels. Among Top 10 frequently asked questions in Java. Very frequently asked to fresh graduates or less experienced professionals. | ||||
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Ans. Its a facility for code reuse and independent extension wherein a derived class inherits the properties of parent class. | ||||
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Like Discuss Correct / Improve  inheritance  object oriented programming (oops)  oops concepts  oops concepts  java concepts  code reuse  code re-use   classes  derived classes Asked in 14 Companies basic   frequent | ||||
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Ans. Destructor is used to de-allocate memory allocated by objects. There are no destructors in Java. Alternatively, Java provides Automatic garbage collection i.e automatically releasing the un-referenced memory. | ||||
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Like Discuss Correct / Improve  destructor  garbage collection Asked in 11 Companies Basic   frequent | ||||
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Ans. 1. Switching Overheads - Even though multi threading aims at improving performance by reducing the wait time and hence improving overall throughput, there is a cost of switching resources between threads and sometime this cost can surpass the benefits if there isnt much wait for IO or external communication. 2. Debugging is hard with multi threaded code. 3. Deadlock - Execution of multi threaded code many a times lead to deadlock due to shared resources. | ||||
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Like Discuss Correct / Improve  multithreading  threads Asked in 4 Companies | ||||
Frequently asked Design Pattern interview question. | ||||
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Ans. The prototype pattern is a creational design pattern. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects. Prototype is used when we need duplicate copies of objects. | ||||
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Like Discuss Correct / Improve  design pattern  prototype design pattern  cloning Asked in 11 Companies intermediate | ||||
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Ans. 404 means the resource is not found on the server.The resource might not be deployed correctly. 500 means internal server error which means that resource was located but then it resulted in some exception or error. 200 means Ok. | ||||
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Ans. An Exception in java is the occurrence during computation that is anomalous and is not expected. Exception handling is the mechanism which is used to handle such situations. | ||||
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Like Discuss Correct / Improve  exception handling Asked in 18 Companies basic   frequent | ||||
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Ans. Factory Design Patterns is the pattern that recommends creation of separate Factory Object for creation of other object. So its like saying - If you want to create an object of ClassA, Talk to FactoryObject ( which is an object of FactoryClass ). FactoryObject in itself encapsulates the inputs and logic required to make the decision regarding the creation and construction of object. | ||||
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Like Discuss Correct / Improve  design pattern  factory design pattern Asked in 9 Companies | ||||
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Ans. [Open Ended Answer] The objective of the question is to check how efficient one is in the language so that appropriate level questions are asked. Don't tell too high number if you are being interviewed for a junior or mid level position as the interviewer may throw advance level questions. | ||||
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Like Discuss Correct / Improve   Asked in 17 Companies | ||||
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Ans. 1. Wrap the desired code in try block followed by a catch / finally to catch the exception 2. Declare the throws clause with exceptions that the code is expected to throw as an indication to the calling method to take care of it. | ||||
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Like Discuss Correct / Improve  exception handling Asked in 4 Companies | ||||
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Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance | ||||
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Like Discuss Correct / Improve  core oops concepts Asked in 65 Companies basic   frequent | ||||
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Ans. Generally one reducer runs for all mappers, but it can be increased as per requirements. | ||||
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