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Core java - Interview Questions and Answers for 'Adp' - 5 question(s) found - Order By Newest

Frequently asked.
 Q1. If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ?Core Java
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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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   Like      Discuss      Correct / Improve     java   collections   list   arraylist   linkedlist   difference between   architecture   data structure   ebay     ADP      basic        frequent

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 Q2. What are the design considerations while making a choice between using interface and abstract class ?Core Java
Anonymous
Ans. Keep it as a Abstract Class if its a "Is a" Relationsship and should do subset/all of the functionality. Keep it as Interface if its a "Should Do" relationship.

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   Like      Discuss      Correct / Improve     java   oops   abstract classes   interfaces   advanced     ADP  AI corporation


 Q3. What is a cloneable interface and what all methods does it contain?Core Java
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Ans. Cloneable is a declaration that the class implementing it allows cloning or bitwise copy of it's object state. It is not having any method because it is a MARKER interface.

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   Like      Discuss      Correct / Improve     java   oops   cloneable   marker interface     ADP


 Q4. What are the types of Executor Interfaces ?Core Java2017-03-09 11:37:29

Ans. Executor - Simple Interface that supports launching new tasks.

ExecutorService - Subinterface of Executor, which adds features that help manage the lifecycle, both of the individual tasks and of the Executor itself.

ScheduledExecutorService - Subinterface of ExecutorService, supports future and-or periodic execution of tasks.

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   Like      Discuss      Correct / Improve     Executor Interfaces     ADP


 Q5. If two Interfaces have same Method, how to handle that Method in a Class implementing these two Interfaces?Core Java2017-03-09 11:37:59

Ans. It doesn't matter how you define that method in implementing class. there will be only one definition provided and that method can be accessed using reference of either of the interfaces.

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   Like      Discuss      Correct / Improve          ADP




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