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Core java - Interview Questions and Answers for 'Centurylink' - 3 question(s) found - Order By Newest

  Q1. What is the use of HashCode in objects ?Core Java
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Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc.

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   Like         Discuss         Correct / Improve     java   string   hashcode   hash code   string comparison  hashtable     Asked in 17 Companies      basic        frequent


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Frequently asked in high end product companies. Frequently asked in Deloitte.
  Q2. How is Hashmap internally implemented in Java ?Core Java2016-12-06 08:49:37

Ans. https://www.quora.com/How-is-Hashmap-in-Java-implemented-internally-What-are-the-pros-and-cons-to-use-it-What-are-the-complexities-it-provides-for-insert-delete-and-lookup/answer/Anshudeep-Bajpai?srid=iwnK

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   Like         Discuss         Correct / Improve     hashmap  collections  hashmap internal implementation     Asked in 18 Companies      expert        frequent


Related Questions

  Difference between TreeMap and HashMap ?
  Difference between HashMap and Hashtable?
  Can you provide some implementation of a Dictionary having large number of words ?
  Which of the following collections stores its elements in insertion Order ?

a. HashMap
b. TreeMap
c. LinkedHashMap
d. LinkedMap
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  If we try to add duplicate key to the HashMap, What will happen ?


 Q3. Write a Program to validate an email addressCore Java2017-01-30 11:12:30

Ans. public class Class{
public static void main(String[] args){
String str = "xyz@123.com";

if(!str.contains("@") && !str.contains(".") && (str.indexOf('.') < str.indexOf('@'))){
System.out.println("Not a Valid Email Address");
}
}
}

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   Like         Discuss         Correct / Improve     validate an email address  coding  code     Asked in 3 Companies


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