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| Interview Questions and Answers for 'Emc' - 7 question(s) found - Order By Newest | |||||
 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  Asked in 61 Companies  Basic  frequent | |||||
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| Advanced level question frequently asked in US based companies. Recently asked in EMC and Intuit. | |||||
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| Ans. Simplest implementation we can have is a List wherein we can place ordered words and hence can perform Binary Search. Other implementation with better search performance is to use HashMap with key as first character of the word and value as a LinkedList. Further level up, we can have linked Hashmaps like , hashmap { a ( key ) -> hashmap (key-aa , value (hashmap(key-aaa,value) b ( key ) -> hashmap (key-ba , value (hashmap(key-baa,value) .................................................................................... z( key ) -> hashmap (key-za , value (hashmap(key-zaa,value) } upto n levels ( where n is the average size of the word in dictionary. | |||||
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| Discuss Correct / Improve java collections hashmap binary search search algorithm advanced architecture data structure Asked in 6 Companies frequent | |||||
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| Ans. The memory pool containing all the reflective data of the java virtual machine itself, such as class and method objects. With Java VMs that use class data sharing, this generation is divided into read-only and read-write areas. The Permanent generation contains metadata required by the JVM to describe the classes and methods used in the application. The permanent generation is populated by the JVM at runtime based on classes in use by the application. In addition, Java SE library classes and methods may be stored here. | |||||
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| Discuss Correct / Improve java jvm memory management permgen permanent generation advanced architecture Asked in 9 Companies expert | |||||
| Frequently asked these days as there are major changes in Java 8. | |||||
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| Ans. Lambda Expressions , Interface Default and Static Methods , Method Reference , Parameters Name , Optional , Streams, Concurrency. | |||||
| Sample Code for Lambda Sample Code for interface default Sample Code for Optional Sample Code for Streams Sample Code for java.time Sample Code for Predicate Sample Code for Consumer Sample Code for MapMerge | |||||
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| Discuss Correct / Improve java java8 technical lead technical architect Asked in 14 Companies expert frequent | |||||
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| Ans. Factory Design Patterns is the pattern that recommends creation of separate Factory Object for creation of other object. So its like saying - If you want to create an object of ClassA, Talk to FactoryObject ( which is an object of FactoryClass ). FactoryObject in itself encapsulates the inputs and logic required to make the decision regarding the creation and construction of object. | |||||
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| Discuss Correct / Improve design pattern factory design pattern Asked in 9 Companies | |||||
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| Ans. No. Default constructor is provided by compiler if no constructor is provided ( argument or no argument ) by us. | |||||
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| Discuss Correct / Improve constructor default constructor Asked in 1 Companies | |||||
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| Discuss Correct / Improve Amazon Web Services (AWS) Redis Memcache | |||||
What will be the output of exceuting main method ?
