Identify the problem within this snippet of Java/C# code implementing Singleton Desig

Q: Identify the problem within this snippet of Java/C# code implementing Singleton Design Pattern. (This is not a trick question, there is a potential real problem in using this code)

Code Java:

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class Singleton
{
public static Singleton Instance()
{
if (_instance == null){
_instance = new Singleton();
return _instance;
}
}
protected Singleton() {}
private static Singleton _instance = null;
}

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Do you know what the problem is and are just asking it as a challenge to others, or do you need help figuring out what the issue is?

i just need a help desperately...
I have too submit an answer for this but there is no way i am seeing to solve this question......
plz plz help me out plz

Can you explain what the problem is?
Are there error messages?
Does the code not work as expected?

Hint: Consider what would happen if multiple threads tried to call Instance() at the same time and _instance = null.

Quote:

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i just need a help desperately...
I have too submit an answer for this but there is no way i am seeing to solve this question......

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How I interpret this statement: I have to turn in a homework assignment and can't figure out the answer to this question - please do so for me. Not going to happen. Of course, maybe I am misinterpreting your problem, in which case you should restate it.

That being said, along with helloworld's hint, here's another: inheritance.