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Goldman Sachs

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

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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 ?

Design

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Ans. [Open Ended Answer]

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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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