When to use Static Class in place of Singleton in Java?

Question

Why can’t we use a static class instead of singleton?

Answer 1

If your application does not maintain the state of the class and used for accessing only global methods then use static class over singleton, In concurrent environment using singleton is better than static as there are more chances your code lead to race condition.

For more information
http://javarevisited.blogspot.in/2013/03/difference-between-singleton-pattern-vs-static-class-java.html