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| Interview Questions and Answers - Order By Rating | ||||
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 Asked multiple times in Capgemini. | ||||
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| Ans. String is immutable in java and stored in String pool. Once it's created it stays in the pool until unless garbage collected, so even though we are done with password it's available in memory for longer duration and there is no way to avoid it. It's a security risk because anyone having access to memory dump can find the password as clear text. | ||||
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 Discuss Correct / Improve  java string class string immutable immutability string pool garbage collection advanced  Asked in 6 Companies  Expert | ||||
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| Ans. ArrayList are implemented in memory as arrays and hence allows fast retrieval through indices but are costly if new elements are to be inserted in between other elements. LinkedList allows for constant-time insertions or removals using iterators, but only sequential access of elements 1. Retrieval - If Elements are to be retrieved sequentially only, Linked List is preferred. 2. Insertion - If new Elements are to be inserted in between other elements , Linked List is preferred. 3. Search - Binary Search and other optimized way of searching is not possible on Linked List. 4. Sorting - Initial sorting could be pain but lateral addition of elements in a sorted list is good with linked list. 5. Adding Elements - If sufficiently large elements needs to be added very frequently ,Linked List is preferable as elements don't need consecutive memory location. | ||||
 Sample Code for ArrayList Sample Code for LinkedList | ||||
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Discuss Correct / Improve java collections list arraylist linkedlist difference between architecture data structure ebay Asked in 2 Companies basic  frequent | ||||
 Try 2 Question(s) Test | ||||
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| Ans. ConcurrentHashMap is a hashMap that allows concurrent modifications from multiple threads as there can be multiple locks on the same hashmap. | ||||
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| Discuss Correct / Improve java collections hashmap map concurrenthashmap concurrenthashmap concurrency general electric ge Asked in 32 Companies rare | ||||
| Frequently asked in Phone Interviews. | ||||
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| Ans. Singleton , Prototype , Request , Session , global-session | ||||
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| Discuss Correct / Improve spring framework bean scope general electric ge | ||||
| Frequently asked in Phone Interviews. | ||||
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| Ans. By Name , By Type and Constructor. | ||||
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| Discuss Correct / Improve java spring spring container dependency injection auto wiring auto wiring types general electric ge | ||||
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| Ans. We should use singleton scope for beans when they are stateless and prototype when they are stateful. | ||||
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| Discuss Correct / Improve spring bean scope general electric ge singleton | ||||
| 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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| Ans. We are using Agile methodology. I attend daily stand up where the development leads takes the status of assigned stories, achievements, any bottlenecks or challenges. We follow iteration of 2 weeks. | ||||
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| Discuss Correct / Improve sdlc agile methodology software system analyst software developer interview development lead project lead interview Asked in 14 Companies frequent | ||||
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| Ans. I am working as a Software System Analyst that specializes in understanding Business Requirements, Analyzing them , Performs Cost / Benefit analysis, Make suggestions to business , translate the business requirements into technical requirements, Discuss their feasibility with the technical team, performs sizing in coordination with developers and prepare high level design document. | ||||
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| Discuss Correct / Improve system analyst software system analyst software business analyst Asked in 4 Companies frequent | ||||
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| Ans. I have primarily worked on Web applications and hence worked on Struts , Spring , Hibernate, JSF ( Java Server Faces ) , Velocity etc. | ||||
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| Discuss Correct / Improve elsevier frameworks java frameworks general question Asked in 3 Companies basic frequent | ||||
| Almost sure to be asked in every company using any Dependency Injection framework ( Spring, Guice etc ) | ||||
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| Ans. It is a Design Pattern that facilitates loose coupling by sending the dependency information ( object references of dependent object ) while building the state of the object. Objects are designed in a manner where they receive instances of the objects from other pieces of code, instead of constructing them internally and hence provide better flexibility. | ||||
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| Discuss Correct / Improve design patterns ioc ( Inversion of Control ) dependency injection Asked in 83 Companies intermediate frequent | ||||
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| Ans. [Open Ended Answer] | ||||
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| 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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| Discuss Correct / Improve ebay fibonacci series Asked in 66 Companies basic frequent | ||||
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| Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=979 | ||||
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| Discuss Correct / Improve coin changer application coin changing general electic (ge) | ||||
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Which of the following collections stores its elements in insertion Order ?
