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

Very frequently asked. Usually asked with questions related to String.
  Q1. What is an Immutable Object ?Core Java
Anonymous
Ans. Object that can't be changed after instantiation.

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Related Questions

  Why is String immutable in Java ?
  Why Char array is preferred over String for storing password?
  What is an immutable class ?
  How to implement an immutable class ?
  Does Declaring an object "final" makes it immutable ?
 How does making string as immutable helps with securing information ? How does String Pool pose a security threat ?
 How is string object immutable if we can concat a string to it ?
  What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ?
  What are advantages of stateless and / or immutable objects ?


Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan (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 Accenture.
  Q3. What is your biggest achievement at work ?General2016-12-15 14:14:22

Ans. [Open Ended Answer]

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  When should we use prototype scope and singleton scope for beans ?
 Which java frameworks have you used ?
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