Interview Questions and Answers for 'Centurylink' | Search Java Interview Question

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

Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback)

Q1. Explain Singleton Design Pattern ?

Design

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Ans. http://www.buggybread.com/2014/03/java-design-pattern-singleton-interview.html

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Related Questions

Difference between Static and Singleton Class ?

What is the difference between these two approaches of creating singleton Class ?

//Double Checked Locking Code
public static Singleton createInstance() {
   if(singleton == null){
      synchronized(Singleton.class) {
         if(singleton == null) {
            singleton = new Singleton();
         }
      }
   }
   return singleton;
}

//Single checked locking code
public static Singleton createInstance() {
   synchronized(Singleton.class) {
      if(singleton == null) {
         singleton = new Singleton();
      }
   }
   return singleton;
}

When should we use prototype scope and singleton scope for beans ?

Shouldn't we make a class with all static members is its just expected to be executed as a standalone program with just one thread. Moreover Lets assume that there is no runtime Polymorphism required and there is no need for serialization ?

Should we have instance variables in the Spring Bean which has been scoped as Singleton ?

What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ?

Action Class is singleton and hence not thread safe in ..

Which of the following is not the difference between Singleton and Static class ( Class with static members only ) ?

Which of the following do you think is the primary reason you would never use a static class even the application doesn't need multiple requests or threads ?

a. Serialization
b. Runtime Polymorphism
c. Lazy Loading
d. Memory

Frequently asked in high end product companies.

Q2. How is Hashmap internally implemented in Java ?

Core Java

^{2016-12-06 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 Intermediate}

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 ?

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