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Core java - Interview Questions and Answers for 'Hexaware' - 2 question(s) found - Order By Newest

Frequently asked in high end product companies. Frequently asked in Deloitte.
  Q1. 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     Veritas  Sophos  Salesforce  United Health Group (UHG)  Priceline.com  Roposo  virtusa polaris  Tata Consultancy (TCS)  Hexaware Technologies  Shiksha Infotech   Synechron  Anand Rathi  Virtusa   CenturyLink  Kasmo Cloud Solutions  Dark Horse  Deloitte      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
 Why HashTable has been deprecated ?
  Can we use null as a key for a map collection ?
  Difference between Map and HashMap ?
  Can we add duplicate keys in a HashMap ? What will happen if we attempt to add duplicate values ?
  Which of the following collection maintain its elements in Natural Sorted order ?
  If we try to add duplicate key to the HashMap, What will happen ?


 Q2. What are var args ?

or

What is the use of var args ?
Core Java2017-05-22 21:16:41

Ans. Var args is the feature of Java that allows a method to have variable number of arguments. Var args are used when we are not sure about the number of arguments a method may need. Internally java treats them as array.

Declarations of methods with var args

void method(int... x){};
void method(int x, int... y){};

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve     var args  methods  functions   method declaration     Hexaware  Bosch


Related Questions

 Which of the following are valid declarations

1. void method(int... x){};
2. void method(int.. x){};
3. void method(int.. .x){};
4. void method(int ...x){};
5. void method(int... x){};
6. void method(int ... x){};
7. void method(int x, int... y){};
8. void method(int... x, int y){};
9. void method(int... x,int... y){};
 What is the difference between these two method declarations ?

private static void method(String[] arg)

and

private static void method(String... arg)
  Which of the following is not valid var args declaration ?
 Can we overload method as following ?

void method(int... x){};
void method(int[] x){};
  Which of the following is false about var args ?
 Why following method declarations are not valid ?

void method(int... x, int y){};
void method(int... x,int... y){};
 Which method will get called if we call it as method(1)

void method(int x ){};
void method(int... x){};
 Do you see any problem with this code

public class BuggyBread {

   public static void main(String[] args) {
      method("Hello","World");
   }

   private static void method(String... args){
      for(String arg:args){
         System.out.println(arg);
      }
   }
}
 Do you see any problem with this code

public class BuggyBread {

   public static void main(String[] args) {
      method();
   }

   private static void method(String... args){
      for(String arg:args){
         System.out.println(arg);
      }
   }
}




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