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| Ans. By using Executor Framework , we can create Thread pool | ||||
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 Discuss Correct / Improve  Thread Pool  Asked in 1 Companies  expert | ||||
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| Ans. https://howtodoinjava.com/java/multi-threading/writing-a-deadlock-and-resolving-in-java/ | ||||
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| Discuss Correct / Improve multithreading threads deadlock Asked in 1 Companies intermediate | ||||
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| This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer. | ||||
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Discuss Correct / Improve web application url Asked in 1 Companies  rare | ||||
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| This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer. | ||||
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| Discuss Correct / Improve database design Asked in 1 Companies expert | ||||
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| This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer. | ||||
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| Discuss Correct / Improve volatile Asked in 1 Companies | ||||
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| This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer. | ||||
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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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| Discuss Correct / Improve oops oops features Asked in 260 Companies basic frequent | ||||
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| Ans. public class BuggyBread1{ public static void main (String args[]) { String str = "hheello world"; char[] charArray = str.toCharArray(); char selectedChar = 'a'; for(char char1: charArray){ if(!str.contains(Character.toString(char1).concat(Character.toString(char1)))){ selectedChar = char1; break; } } System.out.println(str.indexOf(Character.toString(selectedChar))); } } | ||||
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| Discuss Correct / Improve string code coding Asked in 9 Companies | ||||
 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. 1. Stack Segment - Contains primitives, Class / Interface names and references. 2. Heap Segment - Contains all created objects in runtime, objects only plus their object attributes (instance variables), Static variables are also stored in heap. 3. Code Segment - The segment where the actual compiled Java bytecodes resides when loaded | ||||
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| Discuss Correct / Improve java memory memory management stack memory heap memory code segment memory advanced Asked in 9 Companies expert frequent | ||||
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| Advanced level question usually asked in High end product companies. Have been asked in Google and Amazon (Based on 1 Feedback) | ||||
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| Ans. The Java runtime environment deletes objects when it determines that they are no longer being used. This process is known as garbage collection. The Java runtime environment supports a garbage collector that periodically frees the memory used by objects that are no longer needed. The Java garbage collector is a mark-sweep garbage collector that scans Java dynamic memory areas for objects, marking those that are referenced. After all possible paths to objects are investigated, those objects that are not marked (i.e. are not referenced) are known to be garbage and are collected. | ||||
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| Discuss Correct / Improve java garbage collection java memory management advanced Asked in 21 Companies intermediate frequent | ||||
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| Frequently asked question for intermediate developers. Frequently asked in HCL Technologies and EPAM. | ||||
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| Ans. Volatile is a declaration that a variable can be accessed by multiple threads and hence shouldnt be cached. | ||||
 Sample Code for volatile | ||||
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| Discuss Correct / Improve java oops synchronization volatile java keywords Asked in 42 Companies intermediate frequent | ||||
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| Ans. Used to access members of the base class. | ||||
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| Discuss Correct / Improve java oops java keywords super basic interview question Asked in 2 Companies basic frequent | ||||
| Frequently asked to fresh graduates. | ||||
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| Ans. When two threads are waiting each other and cant precede the program is said to be deadlock. | ||||
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| Discuss Correct / Improve java threads multi threading operating system deadlock concurrency Asked in 23 Companies basic frequent | ||||
| 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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| 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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| 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 to experienced developers. Recently asked in many US interviews. | ||||
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| Ans. When multiple external resources are trying to access the DB locks and runs into cyclic wait, it may makes the DB unresponsive. Deadlock can be avoided using variety of measures, Few listed below - Can make a queue wherein we can verify and order the request to DB. Less use of cursors as they lock the tables for long time. Keeping the transaction smaller. | ||||
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| Discuss Correct / Improve java database architecture Asked in 7 Companies expert frequent | ||||
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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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In Case a method is declared to throw an exception , We can only use a call to that method if ...
