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Fair Issac Interview Question for Financial Software Developers






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1. If the class can be serialized then we need to have the readResolve method for our help.

2. If the same class is loaded by two different class loaders then we just cant stop this.

- helper May 09, 2008 | Flag Reply
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You can create as many instances of a singleton class if Reflection is used.

- shunya May 12, 2008 | Flag Reply
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Hey Shunya,

Can you explain a bit more on how you go about having many instances of Singleton using Reflection? and How exactly you can achieve the fail condition?

However, i totally agree that Singleton won't actually behave the way it is intended, in a clustered environment...

- Harsh May 13, 2008 | Flag
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Even if you use Reflection you can actually control the no of instances created. Think about this. Hint: Count

- helper May 22, 2008 | Flag
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Yes, I tried.
Singleton instance = Singleton.getInstance(100);
Singleton another = (Singleton) methods[i].invoke(null, parameters);

These two got two different instances.

- july6th February 25, 2009 | Flag
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No "serialyzed". No "clonable"?

- job-searcher May 10, 2009 | Flag Reply
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1) Reflection
2) If Singleton class implements either Serialization or Cloneable interface and provide the support to both.
3) In multi-threaded environment if synchronization of createInstance() is not taken care.
4) If Singleton class is loaded in Multiple JVM. In case of distributed env.
5) Multiple java class loaders loads the class.
6) Multiple factory taking care of creating the instance is not implemented properly.
7) Subclassing the singleton class.
8) Double checked locking.
9) If class Garbage collected and it again reloaded.
10) Programmatic reloading the class mainly in case of Servlet engine.

- master January 03, 2010 | Flag Reply
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@master: Can you plz tell how to avoid failing of singleton pattern ? will be of great help ..

- KT July 04, 2010 | Flag Reply
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1) DCL failure prior to JDK5
2) Diff class loaders.
3) Serialization

- Anonymous May 22, 2011 | Flag Reply


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