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Differences bet a singleton and class w/ private constructor & public static methods

 
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Not sure about the differences between a singleton and a class with a private constructor & private static class fields & public static methods.
When should we use which and why?

Thanks.
Chulwoo
 
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Static methods aren't polymorphic, so you are missing one of the main advantages of OO if you use them - they inherently lead to a procedural design.

Static classes, as the latter approach often is called, are mostly useful as utility classes, such as java.lang.Math. They should mostly be avoided, in my opinion.
 
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