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Design - Interview Questions and Answers for 'Bank of america india' - 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

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

   Like         Discuss         Correct / Improve     java   design pattern   singleton   at&t   ebay  fidelity india  united healthcare india     Asked in 46 Companies      intermediate        frequent


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 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. How to make sure that only one instance is created in Singleton Pattern ?Core Java
Ans. public class SingleTon {
private SingleTon() {
if (singleTon != null) {
throw new RuntimeException("cant not create the object");
}
}
public Object clone() throws CloneNotSupportedException {
throw new CloneNotSupportedException("can not be create");
}

static private volatile SingleTon singleTon;
public static SingleTon getInstance() {
SingleTon singleTon = this.sample;
if (singleTon == null) {
synchronized (this) {
singleTon = this.singleTon;
if (singleTon == null) {
singleTon = this.singleton = new SingleTon();
}
}
}
return singleTon;
}
}

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

   Like         Discuss         Correct / Improve     singleton  design pattern     Asked in 2 Companies


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 ?
  Explain Singleton Design Pattern ?



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