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Design - Interview Questions and Answers for 'Jp morgan' - 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 for Lead and Architect positions. Recently asked in many US companies.
  Q2. What are Anti Patterns ?Design2016-07-14 14:21:11

Ans. Anti-pattern is simply the creation of a pattern in your coding that negatively affects your code i.e the Negatives surpasses the positives.

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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 ?
 Write a Program to print pattern like following

*
**
***
****
*****
*****
****
***
**
*
  Difference between Factory and Builder Design Pattern ?
  Difference between Proxy and Adapter ?
  Difference between Adapter and Facade ?
  Difference between Builder and Composite ?


 Q3. What are design situations to use Singleton and Prototype Design Pattern ?Design2016-07-28 20:28:43

Ans. Both are creational design patterns.

Singleton is used when we would like to reuse an object if object is not supposed to hold request or thread specific information. Inversely Prototype is used in situations where we would like to reuse the object information but the request / thread may require it own data to be persisted.

In short, Singleton is used in situations where we can live with single object being shared across multiple requests or threads whereas Prototype is used when we need duplicate copies of objects.

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Related Questions

  When should we use prototype scope and singleton scope for beans ?
 Does it make sense to clone an object which is supposed to be immutable ?
 What is a prototype design pattern ?
 What is the difference between Singleton and Prototype Bean scope in Spring ?
 Can we use Prototype Bean scope with Autowiring ?




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