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| Ans. Its the process of creating XML structures out of Java Objects which is used to traverse information across the network. | ||||
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 Discuss Correct / Improve  xml java api for xml marshalling parser sax dom technologies  Asked in 1 Companies | ||||
 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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Discuss Correct / Improve j2ee spring mvc frameworks web applications architecture Asked in 11 Companies  Basic  frequent | ||||
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| Ans. Combine the data of our application and its manipulation at one place. Encapsulation Allow the state of an object to be accessed and modified through behaviors. Reduce the coupling of modules and increase the cohesion inside them. | ||||
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| Discuss Correct / Improve java oops oops concepts encapsulation object oriented programming (oops) oops concepts basic interview question Asked in 2 Companies basic frequent | ||||
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| Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc. | ||||
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| Discuss Correct / Improve java string hashcode hash code string comparison hashtable Asked in 17 Companies basic frequent | ||||
| Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. | ||||
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| Ans. Underlying data structure for ArrayList is Array whereas LinkedList is the linked list and hence have following differences - 1. ArrayList needs continuous memory locations and hence need to be moved to a bigger space if new elements are to be added to a filled array which is not required for LinkedList. 2. Removal and Insertion at specific place in ArrayList requires moving all elements and hence leads to O(n) insertions and removal whereas its constant O(1) for LinkedList. 3. Random access using index in ArrayList is faster than LinkedList which requires traversing the complete list through references. 4. Though Linear Search takes Similar Time for both, Binary Search using LinkedList requires creating new Model called Binary Search Tree which is slower but offers constant time insertion and deletion. 5. For a set of integers you want to sort using quicksort, it's probably faster to use an array; for a set of large structures you want to sort using selection sort, a linked list will be faster. | ||||
 Sample Code for ArrayList Sample Code for LinkedList | ||||
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| Discuss Correct / Improve collections java data structures arraylist linkedlist arraylist vs linkedlist Asked in 61 Companies Basic frequent | ||||
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| Frequently asked to fresh graduates and less experienced. | ||||
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| Ans. 1. public is the access modifier that makes the method accessible from anywhere, static is the keyword that makes it accessible even without creating any object, void means it doesn't return anything , String args[] is the array of argument that the method receives. 2. If we use main without the string args , it will compile correctly as Java will treat it as just another method. It wont be the method "main" which Java looks for when it looks to execute the class and hence will throw Error: Main method not found in class , please define the main method as: public static void main(String[] args) 3. Main is not a keyword but a special string that Java looks for while initiating the main thread. | ||||
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| Discuss Correct / Improve java main method Asked in 4 Companies basic frequent | ||||
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| Ans. Criteria is a simplified API for retrieving entities by composing Criterion objects. For example - session.createCriteria(Employee.class).add( Restrictions.like("name", "A%") ).list(); will return all employee objects having name starting with A. | ||||
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| Discuss Correct / Improve hibernate hibernate criteria Asked in 7 Companies Basic Frequent | ||||
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| Ans. We are using SVN and Git Hub. | ||||
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| Discuss Correct / Improve build management version control systems configuration management configuration manager version control manager Asked in 1 Companies | ||||
| 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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| Discuss Correct / Improve java classes abstract class interfaces abstract class vs interface abstract classes vs interfaces Asked in 82 Companies basic frequent | ||||
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| Ans. We are using cluster of Web servers and Application servers. Load Balancer is used to manage the load between them. Down the layer we have middleware server and then DB server to access database. | ||||
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| Ans. It should either implement all interface methods or declare unimplemented methods as abstract. | ||||
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| Discuss Correct / Improve interfaces Asked in 1 Companies Basic frequent | ||||
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What will be the output of exceuting main method ?
