When to use Static class & when to use Singleton pattern?

With the singleton pattern, you get several advantages.

• First, a singleton can extend classes and implement interfaces, while a static class cannot. See an example here.
• Singleton class can be passed as a parameter while a static class cannot be.
• Singleton class can be loaded lazily/asynchronously when needed while static class is always loaded.

• Best Answers:
• https://stackoverflow.com/questions/519520/difference-between-static-class-and-singleton-pattern