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| Interview Questions and Answers for 'ZapCom' - 5 question(s) found - Order By Newest | |||||
 Basic and Very Frequently asked. | |||||
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| Ans. Polymorphism means the condition of occurring in several different forms. Polymorphism in Java is achieved in two manners 1. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas 2. Dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding. | |||||
 Sample Code for overloading Sample Code for overriding | |||||
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 Discuss Correct / Improve  polymorphism object oriented programming (oops) oops concepts oops concepts  Asked in 107 Companies  Basic  frequent | |||||
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| 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 80 Companies intermediate frequent | |||||
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| Ans. The purpose of comparator interface is to compare objects of the same class to identify the sorting order. Sorted Collection Classes ( TreeSet, TreeMap ) have been designed such to look for this method to identify the sorting order, that is why class need to implement Comparator interface to qualify its objects to be part of Sorted Collections. | |||||
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| Discuss Correct / Improve java collections treemap treeset comparator Asked in 2 Companies Intermediate | |||||
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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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| Discuss Correct / Improve java design pattern singleton at&t ebay fidelity india united healthcare india Asked in 46 Companies intermediate 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 | |||||
Static Polymorphic in Java is achieved through .. 
