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| Core java - Interview Questions and Answers for 'Credit agricole' - 3 question(s) found - Order By Newest | ||||
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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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 If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ? | ||||
| Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ? | ||||
| In a Linked list with sorted numbers, insert a new numbers while maintaining the sort order. | ||||
| Collections.sort can only be performed on .. a. Set b. List c. Map d. Any Collection implementation | ||||
| Is this a valid initialization ? Explain. Collection<Collection> collection = new LinkedList<LinkedList>(); | ||||
| What is the difference between List, Set and Map ? or What are the different Java Collections Interfaces ? | ||||
| Difference between Vector and ArrayList ? | ||||
| Overridden methods must have the same ... | ||||
| Which of the following doesn't extend Collection interface ? | ||||
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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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| Ans. This collections class has been implemented in such a manner that it can never throw ConcurrentModificationException. As it performs update and write operations by creating a new copy of ArrayList, It's slower compared to ArrayList. | ||||
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