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Design - Interview Questions and Answers for 'Goldman sachs' - 3 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

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

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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 face to face interviews.
  Q2. Write a program to print fibonacci series.Core Java

Ans. int count = 15;
int[] fibonacci = new int[count];
fibonacci[0] = 0;
fibonacci[1] = 1;
for(int x=2; x < count; x++){
fibonacci[x] = fibonacci[x-1] + fibonacci[x-2];
}

for(int x=0; x< count; x++){
System.out.print(fibonacci[x] + " ");
}

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Related Questions

  What are the steps to be performed while coding Junit with Mocking framework ?
  What is a Sequence File?
 What different level of logging you use while coding ?
 Have you ever encoded the response before sending it back from the service? If Yes , Which encoding was used ?
 What are the different type of encoding you have used ?
 How does encoding affect using Reader / writer classes or Stream classes in Java ?


Very Frequently asked to Senior Software Engineers or Developers.
  Q3. Describe some of the Design Patterns you have used ?Design2016-12-01 16:31:17

Ans. [Open Ended Answer]

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

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Related Questions

 What is Dependency Injection or IOC ( Inversion of Control ) ?
  What are the Wrapper classes available for primitive types ?
  Difference between Factory and Abstract Factory Design Pattern ?
  What is MVC ?
  What Design pattern Wrapper Classes implement ?
  Difference between Factory and Builder Design Pattern ?
  Difference between Proxy and Adapter ?
  Difference between Adapter and Facade ?
  Difference between Builder and Composite ?
  Example of Chain of Responsibility Design Pattern ?




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