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

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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Related Questions

Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object?

Write a class and override the equals and hashcode method ?

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

Q2. 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. Frequently asked in Deloitte.

Q3. 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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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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