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Interview Questions and Answers - Order By Newest | ||||
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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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Like Discuss Correct / Improve  architecture   production support   java   servers   application support Asked in 7 Companies   frequent | ||||
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Ans. Fail-fast iterators detect illegal concurrent modification during iteration and fail quickly and cleanly rather than risking arbitrary, non deterministic behavior at an undetermined time in future. Example could be of an Iterator failing if it smells ConcurrentModificationException. | ||||
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Like Discuss Correct / Improve  fail-fast Iterators  Iterators Asked in 5 Companies intermediate | ||||
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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 | ||||
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Ans. [Open Ended Answer] This is a very sensitive question and should be dealt with caution. Just simply saying that you never had any disagreement will present you as dumb team member. Showing your self as too aggressive in such decisions will present you as a trouble maker. You should present a situation where you had an argument / disagreement but eventually you and your team mates mutually found a way out of it. | ||||
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Like Discuss Correct / Improve   Asked in 20 Companies basic | ||||
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Ans. [Open Ended Answer] | ||||
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Like Discuss Correct / Improve  elsevier   open ended questions   overstock.com   cerner Asked in 15 Companies   frequent | ||||
Frequently asked in face to face interviews. | ||||
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Ans. int count = 15; int[] fibonacci = new int[count]; fibonacci[0] = 0; fibonacci[1] = 1; for(int x=2; x < count; x++){ fibonacci[x] = fibonacci[x-1] + fibonacci[x-2]; } for(int x=0; x< count; x++){ System.out.print(fibonacci[x] + " "); } | ||||
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Like Discuss Correct / Improve  ebay   fibonacci series Asked in 66 Companies basic   frequent | ||||
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Ans. The goal of a synchronised block is to achieve mutual exclusion i.e at one time, the segment of the code should be executed by single thread only and hence the lock needs to be retrieved before executing the segment and then released. | ||||
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Like Discuss Correct / Improve  synchronized block   synchronized   synchronization   multithreading   threads   mutual exclusion   concurrency Asked in 4 Companies intermediate   frequent | ||||
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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. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=965 | ||||
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Like Discuss Correct / Improve  constructor overloading  code  coding Asked in 2 Companies basic | ||||
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Ans. There was no multiple inheritance in java before version 8 as implementing multiple interfaces cannot be termed as inheritance. With Java 8 , came the concept of default methods wherein the class implementing the interface carries the default implementation from the interface and hence facilitating multiple inheritance. | ||||
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Like Discuss Correct / Improve  multiple inheritance  object oriented programming (oops)  oops concepts   inheritance  object oriented programming (oops)  oops concepts   oops concept Asked in 10 Companies   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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Frequently asked to Fresh graduates. | ||||
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Ans. http://algs4.cs.princeton.edu/11model/BinarySearch.java.html | ||||
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Like Discuss Correct / Improve  binary search  search Asked in 5 Companies basic   frequent | ||||
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Ans. <a href="http://www.programcreek.com/2009/02/diagram-for-hierarchy-of-exception-classes/" rel="nofollow">http://www.programcreek.com/2009/02/diagram-for-hierarchy-of-exception-classes/</a> | ||||
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Like Discuss Correct / Improve  exception hierarchy   exceptions Asked in 3 Companies | ||||
All these acronyms JDK,JRE,JVM etc are very frequently asked. | ||||
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Ans. JRE or Java Runtime Environment is the Java Virtual Machine on which class files are executed. It includes borwser plugins that facilitates execution of class files in browsers. JDK or Java Development Kit includes JRE , compiler and development tools. | ||||
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Like Discuss Correct / Improve  JDK  JRE  JDK vs JRE  Difference between Asked in 4 Companies basic   frequent | ||||
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Ans. 1. Issue with Jar and ClassPath Conflicts 2. Killing JVM will terminate all applications | ||||
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Like Discuss Correct / Improve  JVM Asked in 1 Companies | ||||
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Ans. We creates separate branches for each project if development work is going on parallel and they are to be released at different times. Once the first release is done, we merge the branch changes into trunk. If they all have to go at one time, we usually would merge everything in the trunk itself. | ||||
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Like Discuss Correct / Improve  scm  source code management  svn  version control  code repository  svn branch Asked in 1 Companies | ||||
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Ans. Multi Level Inheritance is multi level hierarchy of classes. Here is the example - http://www.buggybread.com/2015/09/java-se-class-diagram-classes-that_603.html Class RoleList extends ArrayList which in turn extends AbstractList which in turn extends AbstractCollection. | ||||
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Like Discuss Correct / Improve  multilevel inheritance  object oriented programming (oops)  oops concepts  inheritance  object oriented programming (oops)  oops concepts  oops concepts Asked in 3 Companies basic | ||||
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Frequently asked question in companies using Rest Web services. | ||||
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Ans. PUT requests are only meant to place the object as it is on server. For example - You want a file to be uploaded and then placed in a particular folder or you want an Employee object to be persisted in the table. POST requests are also meant to transfer information from client to server but that information once received at the server is evaluated , modified or refactored before persisting. | ||||
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Like Discuss Correct / Improve  Put vs Post   Rest Asked in 5 Companies   frequent | ||||
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Ans. It depends on whether the request object is persisted as it is or its first dismantled, modified or refactored and then inserted into DB. In first case, it should be a PUT request whereas in second case it should be a POST Request. | ||||
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Like Discuss Correct / Improve  Put vs Post   Rest Asked in 2 Companies intermediate   frequent | ||||
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Ans. Enums in Java are used to declare predefined objects and then reuse them. they offer many benefits 1. Enum instance are type safe and thread safe. 2. Enum instances are singleton and hence reused. 3. If we use Enums with Switch , It makes sure that the passed argument is either of its instance and hence provides a safeguard. 4. If we use Enum with Sorted Collections we can sort the elements with a predefined priorities ( as per constant declaration in enum ) 5. We can use Enum as a Factory by defining its constructor. 6. We can store related constant data within enum. For example - If we know the values for the map upfront, we can alternatively use an enum. | ||||
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Like Discuss Correct / Improve   Asked in 6 Companies | ||||
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Ans. We can use external table feature of Oracle. | ||||
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Like Discuss Correct / Improve   Asked in 1 Companies Intermediate | ||||
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. <a href="http://javahungry.blogspot.com/2015/03/difference-between-array-and-arraylist-in-java-example.html" rel="nofollow">http://javahungry.blogspot.com/2015/03/difference-between-array-and-arraylist-in-java-example.html</a> | ||||
Sample Code for ArrayList | ||||
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Like Discuss Correct / Improve  array  arraylist Asked in 11 Companies basic   frequent | ||||
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Ans. 59 23 28-31 * * [ "$(date +%d -d tomorrow)" = "01" ] && job_name | ||||
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Like Discuss Correct / Improve  unix  crontab Asked in 1 Companies | ||||
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Ans. du -a /var | sort -n -r | head -n 10 | ||||
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Like Discuss Correct / Improve  unix command Asked in 1 Companies | ||||
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Ans. PID - process identification number is an identification number that is automatically assigned to each process when it is created USER - User Name PR - PR is the process actual priority NI is the nice value, which is a user-space concept. VIRT -Virtual Image (kb). The total amount of virtual memory used by the task. RES - Resident size (kb). The non-swapped physical memory a task has used. SHR - Shared Mem size (kb). The amount of shared memory used by a task. S - Process Status. The status of the task which can be one of: D = uninterruptible sleep R = running S = sleeping T = traced or stopped Z = zombie %CPU - % CPU usage %MEM - % MEM Usage TIME - Total CPU time the task has used since it started. COMMAND - Command which was used to execute the process | ||||
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Ans. Collections in java is a framework of classes that provides an abstracted data structure to store and manipulate the group of objects. Each class is unique in the way it stores , search , sort and modify the elements. | ||||
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Like Discuss Correct / Improve  collections  collection classes Asked in 1 Companies Basic   frequent | ||||
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Ans. int[] arr = {1,-1,2,-3,3,-4,4,5,6,-5,-6,-7,-8,8,9,-9}; List positiveNumbers = new ArrayList<>(); List negativeNumbers = new ArrayList<>(); for(int i = 0; i < arr.length(); i ){ if(I < 0){ negativeNumbers.add(i); } else { positiveNumbers.add(i); } } System.out.println("Positive Numbers:" + positiveNumbers); System.out.println("Negative Numbers:" + negativeNumbers); | ||||
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Like Discuss Correct / Improve  code  program  coding Asked in 1 Companies | ||||
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Ans. Maven is a build automation tool used primarily for Java projects. | ||||
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Like Discuss Correct / Improve  maven  build Asked in 6 Companies basic   frequent | ||||
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Ans. Throwable | ||||
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Like Discuss Correct / Improve   Asked in 1 Companies basic   frequent | ||||