Design - Interview Questions and Answers for 'Birlasoft' | Search Interview Question

Design - Interview Questions and Answers for 'Birlasoft' - 2 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

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 Singleton and Prototype Bean scope in Spring ?

serialization and deserialization of 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;
}

What are design situations to use Singleton and Prototype Design Pattern ?

How to avoid cloning, serialization in the singleton class ?

When singleton can break and how to resolve it

If you are given choice to either load object eagerly or lazily , which one would you use in case of singleton pattern ?

When should we use prototype scope and singleton scope for beans ?

Q2. Difference between Singleton and Factory Design Pattern ?

Design

Ans. Both are creational design patterns but singleton facilitates in creation and reuse of single object whereas Factory deals with creation of multiple objects.

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Related Questions

Difference between Factory and Abstract Factory Design Pattern ?

Difference between Factory and Builder Design Pattern ?

Difference between Factory and Strategy Design Pattern ?

Please specify in what sequence the objects of following classes will be created ?

Session , SessionFactory, Query , Configuration

What are the advantages and disadvantages of Factory Design Pattern ?

What is ThreadFactory ?

How many SessionFactory and Session objects are created ?

Which class provides the enumerated value for Bean Scope ?

What is a factory design pattern ?

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